Spectra-Physics 3980 User manual

Model 3980
Frequency Doubler and Pulse Selector
User’s Manual
The Solid-State Laser Company
1335 Terra Bella Avenue
Mountain View, CA 94043
Part Number 0000-288A, Rev. C
August 2002

iii
Preface
This manual contains information you need in order to safely install, oper-
ate, maintain, and service your Model 3980 frequency doubler/pulse selec-
tor on a day-to-day basis.
The “Introduction” chapter contains a brief description of the Model 3980.
This is followed by an important chapter on laser safety. The Model 3980 is
designed for use with a Spectra-Physics Tsunami®mode-locked Ti:sap-
phire laser that is pumped by either a Millennia®diode-pumped, solid-state
cw laser or a BeamLok®2060 or 2080 ion laser. These are all Class IV—
high power lasers that emit laser radiation which can permanently damage
eyes and skin. This laser safety section contains information about these
hazards. To minimize the risk of injury or expensive repairs to the instru-
ments involved, carefully follow these instructions. This chapter also con-
tains information regarding system compliance to CDRH and CE
regulations with regards to high power lasers.
The “Description” chapter contains an overview of the Model 3980, and it
explains its intended use with the Tsunami laser. Following this overview is
a more detailed description of the Model 3980 which concludes with speci-
fications and outline drawings.
The next few chapters describe the Model 3980 controls and interconnects
and guide you through its installation, alignment and operation. The last
part of the manual covers maintenance and service and includes a replace-
ment parts list and a list of world-wide Spectra-Physics service centers you
can call if you need help.
While this manual contains a brief installation procedure, it is not intended
as a guide to the initial installation and set-up of your Model 3980. Please
wait for the Spectra-Physics service engineer who has been assigned this
task as part of your purchase agreement. Allow only those qualified and
authorized by Spectra-Physics to install and set up your system.
Whereas the “Maintenance” section contains information you need to keep
your unit clean and operational on a day-to-day basis, “Service and Repair”
is intended to help you guide your Spectra-Physics field service engineer to
the source of any problems. Do not attempt repairs yourself while the unit
is still under warranty; instead, report all problems to Spectra-Physics for
warranty repair.
Finally, if you encounter any difficulty with the content or style of this
manual, please let us know. The last page is a form to aid in bringing such
problems to our attention.
Thank you for your purchase of Spectra-Physics instruments.

v
Table of Contents
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii
Warning Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix
Standard Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi
Unpacking and Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiii
Unpacking Your Model 3980. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiii
System Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiii
Accessory Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiii
Chapter 1: Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
System Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Understanding the Model Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Available Upgrades . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Chapter 2: Laser Safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Precautions for the Safe Operation of Class IV-High Power Lasers . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Safety Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Interlock Shutter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Maintenance Required to Keep this Laser Product in Compliance with
Center for Devices and Radio logical Health (CDRH) Regulations . . . . . . . . . . . . . . . . . . . . . . . . 2-4
CE/CDRH Warning Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Label Translations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
CE Declaration of Conformity (emissions) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
CE Declaration of Conformity (safety). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Sources for Additional Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Laser Safety Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Equipment and Training . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
Chapter 3: Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Frequency Doubling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Picosecond Frequency Doubling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2
Femtosecond Frequency Doubling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Pulse Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Gating Pulses Through the Bragg Cell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Maintaining Good Beam Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Protecting the AOM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Changing Optics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
The Model 3986 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Performance Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
Outline Drawings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12

Model 3980 Frequency Doubler/Pulse Selector
vi
Chapter 4: Controls, Indicators, and Connections . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Optical Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
External Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
General Purpose Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2
Pulse Selector Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3
Frequency Doubler Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-5
Model 3986 Electronics Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-7
Front Panel Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-7
Rear Panel Controls and Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-8
Model 3983 Electronics Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-10
Front Panel Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-10
Rear Panel Controls and Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-11
Chapter 5: Installation and Alignment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1
Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-2
General Installation and Alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-2
Pulse Selector Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-5
Frequency Doubler Installation: Part I—For Systems Without or not Using the Pulse Selector . .5-9
Frequency Doubler Installation: Part II—All Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-9
Converting Your System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-11
Converting from a Picosecond to a Femtosecond Pulse Selector . . . . . . . . . . . . . . . . . . . . . . . . .5-13
Converting from a Femtosecond to a Picosecond Pulse Selector . . . . . . . . . . . . . . . . . . . . . . . . .5-13
Converting From a Picosecond to a Femtosecond Frequency Doubler . . . . . . . . . . . . . . . . . . . .5-14
Converting From a Femtosecond to a Picosecond Frequency Doubler . . . . . . . . . . . . . . . . . . . .5-14
Converting from a Femtosecond Model 3980-6 to a
Model 3980-4 Femtosecond Frequency Doubler Only Unit . . . . . . . . . . . . . . . . . . . . . . . . . .5-15
Converting from a Femtosecond Model 3980-6 to a
Model 3980-1 Picosecond Frequency Doubler Only Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-15
Converting from a Picosecond Model 3980-3 to a
Model 3980-5 Femtosecond Pulse Selector Only Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-16
Chapter 6: Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1
All Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1
All Models except Model 3980-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1
Models 3980-1, -3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1
Models 3980-2, -3, -5, -6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1
Shut-down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-2
All Models Except Model 3980-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-2
Model 3980-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-2
Changing Optics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-3
System Conversions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-3
Chapter 7: Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
Notes on the Cleaning of Laser Optics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-1
Equipment Required: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-1
Standard Cleaning Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-1
General Procedures for Cleaning Optics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-2
Cleaning the AOM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-3
Cleaning the SHG Crystal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-4

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vii
Chapter 8: Service and Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4
Chapter 9: Customer Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1
Return of the Instrument for Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-2
Service Centers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3
Appendix A: Selecting Proper Line Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
Appendix B: Optimizing the Tsunami Laser Output. . . . . . . . . . . . . . . . . . . . . . . . . . B-1
Recommended Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
Optimizing Picosecond Tsunami Laser Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2
Optimizing Femtosecond Tsunami Laser Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3
Notes
Report Form for Problems and Solutions
List of Figures
Figure 1-1: The Model 3980 Frequency Doubler/Pulse Selector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Figure 1-2: Model 3980 Schematic and Optical Beam Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Figure 2-1: Standard Safety Warning Sign . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Figure 2-2: Folded Metal Beam Target . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Figure 2-3: The Model 3980 Interlock Shutter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Figure 2-4: Model 3980 CDRH/CE Warning Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Figure 3-1: Model 3980 Schematic and Optical Beam Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Figure 3-2: Beam Diffraction Through A Typical Acousto-optic Modulator (AOM) . . . . . . . . . . . . . . . . 3-4
Figure 3-3: Output pulse width from the AOM as a function of input pulse width. . . . . . . . . . . . . . . . . 3-6
Figure 3-4: Typical frequency-doubled, Tsunami ps tuning curves using 10 W TEM00
pump power from a Millennia Xs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
Figure 3-5: Typical frequency-doubled, Tsunami fs tuning curves using 10 W TEM00
pump power from a Millennia Xs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
Figure 3-6: Outline Dimensions for the Model 3980, Model 3986, and Model 3983 . . . . . . . . . . . . . . 3-12
Figure 4-1: External Controls and Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Figure 4-2: Model 3980 Optical Elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Figure 4-3: Pulse Selector Components and Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Figure 4-4: AOM and Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Figure 4-5: Frequency Doubler Components and Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
Figure 4-6: Model 3986 Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Figure 4-7: Model 3986 Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
Figure 4-8: AOM Driver Schematic Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9
Figure 4-9: Model 3983 Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
Figure 4-10: Model 3983 Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
Figure 5-1: The Pulse Selector Platform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
Figure 5-2: Beam Location Through the AOM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7
Figure 5-3: The Frequency Doubler Platform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10
Figure 7-1: Lens Tissue Folded for Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3
Figure A-1: Power Switch, Line Cord, and Voltage Selector Module . . . . . . . . . . . . . . . . . . . . . . . . . . A-1

Model 3980 Frequency Doubler/Pulse Selector
viii
List of Tables
Table 1-1: Optional System Upgrades . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-4
Table 2-1: Label Translations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-6
Table 3-1: Model 3980-1 ps Frequency Doubler Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-8
Table 3-2: Model 3980-4 fs Frequency Doubler Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-8
Table 3-3: Model 3980-2 ps Pulse Selector Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-9
Table 3-4: Model 3980-3 ps Pulse Selector/Doubler Performance . . . . . . . . . . . . . . . . . . . . . . . . . . .3-9
Table 3-5: Model 3980-2 ps Pulse Selector, -3 ps Pulse Selector/Doubler Performance . . . . . . . . . .3-9
Table 3-6: Model 3980-5 fs Pulse Selector Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-10
Table 3-7: Model 3980-6 fs Pulse Selector/Doubler Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-10
Table 3-8: Model 3980-5 fs Pulse Selector, -6 fs Pulse Selector/Doubler Performance . . . . . . . . . . .3-9
Table 3-9: Electrical/Mechanical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-10
Table 5-1: L1and L2Lens Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-5
Table 5-2: System Conversions for the 3980 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-12
Table 8-1: Replacement Parts, Frequency Doubler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-4
Table 8-2: Replacement Parts, Pulse Selector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-4
Table 8-3: Replacement Parts, Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-4

ix
Warning Conventions
The following warnings are used throughout this manual to draw your
attention to situations or procedures that require extra attention. They warn
of hazards to your health, damage to equipment, sensitive procedures, and
exceptional circumstances. All messages are set apart by a thin line above
and below the text as shown here.
Warning!
ESD
Laser radiation is present.
Condition or action may present a hazard to personal safety.
Condition or action may cause damage to equipment.
Condition or action may cause poor performance or error.
Text describes exceptional circumstances or makes a special refer-
ence.
Do not touch.
Appropriate laser safety eyewear should be worn during this opera-
tion.
Danger!
Warning!
Don't
Touch!
Eyewear
Required
Note
Condition or action may present an electrical hazard to personal
safety.
Refer to the manual before operating or using this device.
Action may cause electrostatic discharge and cause damage to equip-
ment.
Danger!
Laser Radiation
Danger!
Caution!

xi
Standard Units
The following units, abbreviations, and prefixes are used in this Spectra-
Physics manual:
Quantity Unit Abbreviation
mass kilogram kg
length meter m
time second s
frequency hertz Hz
force newton N
energy joule J
power watt W
electric current ampere A
electric charge coulomb C
electric potential volt V
resistance ohm Ω
inductance henry H
magnetic flux weber Wb
magnetic flux density tesla T
luminous intensity candela cd
temperature celcius C
pressure pascal Pa
capacitance farad F
angle radian rad
Prefixes
tera (1012)T deci (10-1)dnano
(10-9)n
giga (109)G centi (10-2)cpico
(10-12)p
mega (106)Mmill
(10-3)mfemto (10-15)f
kilo (103)kmicro
(10-6)µatto (10-18)a

xiii
Unpacking and Inspection
Unpacking Your Model 3980
Your Model 3980 frequency doubler/pulse selector was packed with great
care, and its container was inspected prior to shipment—it left Spectra-
Physics in good condition. Upon receiving your unit, immediately inspect
the outside of the shipping container. If there is any major damage (holes in
the containers, crushing, etc.), insist that a representative of the carrier be
present when you unpack the contents.
Carefully inspect your unit as you unpack it. If any damage is evident, such
as dents or scratches on the cover or broken knobs, etc., immediately notify
the carrier and your Spectra-Physics sales representative.
Keep the shipping container. If you file a damage claim, you may need it
to demonstrate that the damage occurred as a result of shipping. If you need
to return the unit for service at a later date, the specially designed container
assures adequate protection.
System Components
The following components comprise the Model 3980 frequency doubler/
pulse selector:
• Model 3980 frequency doubler/pulse selector
• Model 3986 or 3983 electronics module (a Model 3980-4 requires
only a heater controller)
• Accessory cables
• U. S. or European power cable (2.5 m)
• Accessory kit (see below)
Verify these components are present. They are all shipped in one container.
Accessory Kit
Included with the Model 3980 is this manual, a packing slip listing all the
parts shipped, and an accessory kit containing the following items:
• a tool kit containing various Allen wrenches and drivers plus 3 foot
clamps for the Model 3980
• a glass bottle for optics cleaning solution
• a plastic hemostat
• tweezers
• an infrared detector card

Model 3980 Frequency Doubler/Pulse Selector
xiv
• a packet of Kodak Lens Cleaning Paper™
• an external 3 db attenuator
• a set of 38 mm lenses if you purchased a pulse selector system and a
75 mm lens if you purchased a fs frequency doubler/pulse selector sys-
tem.
• You will need to supply several items, including:
• spectrophotometric-grade (HPLC) acetone and methanol for optics
cleaning
• clean, lint-free finger cots or powder-less latex gloves for optics clean-
ing

1-1
Chapter 1 Introduction
The Spectra-Physics Model 3980 frequency doubler/pulse selector (Figure
1-1) is designed to operate as a companion product to the Spectra-Physics
Tsunami®mode-locked Ti:sapphire laser product.
Overview
System Components
The following components comprise the Model 3980 frequency doubler/
pulse selector:
• Model 3980 frequency doubler/pulse selector
• Model 3986 or 3983 electronics module (a Model 3980-4 requires no
electronics module)
The Tsunami Ti:sapphire mode-locked laser is tunable over a broad range
in the red and near infrared (ir) spectrum, 690 to 1080 nm. Within this
range the laser emits a nominal 80 MHz pulse train of optical pulses with
duration from 80 ps to less than 80 fs, with corresponding maximum peak
power output of about 150 kW. The Model 3980 frequency doubler/pulse
selector allows you to select pulses at a rate lower than the nominal 80
MHz rate and to frequency double those pulses.
Figure 1-1: The Model 3980 Frequency Doubler/Pulse Selector

Model 3980 Frequency Doubler/Pulse Selector
1-2
Because of its modular design, the Model 3980 is available in several con-
figurations: as a frequency doubler only, a pulse selector only, or both.
Each combination can be set up for either fs or ps operation. A system ini-
tially purchased with a single function can be economically upgraded to
include the other at any time.
The Model 3980 typically comprises two enclosures: an optical unit con-
taining either the frequency doubler or pulse selector or both, and an elec-
tronics control unit. A Model 3983 electronics unit comes with systems
having only a ps frequency doubler, and it contains only the heater elec-
tronics for the temperature stabilization of the ps LBO (lithium tri-borate)
second harmonic generation (SHG) crystal. A Model 3986 electronics unit
comes with systems containing a pulse selector, and it contains the drive
electronics for the pulse selector as well as the heater electronics for sys-
tems that include ps frequency doubling. The pulsed rf amplifier delivers
up to 10 W bursts of ≈390 MHz rf energy into the rf input of the Model
3980.
If ps frequency doubling is not included in the system, the heater electron-
ics are disabled. No electronics unit is provided when a fs doubler is
ordered alone. A fs doubler system uses a BBO (barium beta borate) SHG
crystal, which requires no heater.
©
Figure 1-2: Model 3980 Schematic and Optical Beam Path
Compensator SHG
Crystal
Acousto-optic
Modulator
(Bragg Cell)
Beam Block
M1
L2L1
M2
M4
P1
M5
M3
P3
P2
Residual
Fundamental
Second
Harmonic
Input
Foot Adjust (3)
Shutter
Crystal Angle
Micrometer Adjust
Optional
Input
Pulse-selected
fundamental
(M1removed)
Collimating
Lens
Focusing
Lens
PC Board
Pulse Stretcher
V
H
V
H
V
H
V
H

Introduction
1-3
Figure 1-2 shows a Model 3980 containing both a frequency doubler and a
pulse selector, each on separate platforms. There are two input ports and
three output ports. In practice, only the pulse selector input port is used.
This allows the Model 3980 to be butted against the Tsunami laser output
bezel to save table space and preserve a collinear alignment of the two
enclosures. Three output ports provide exits for the pulse-selected funda-
mental beam, the frequency-doubled output beam, and the residual funda-
mental beam from the frequency doubler.
Understanding the Model Numbers
The Model 3980 allows you to select (a) pulse selection alone, (b) fre-
quency doubling alone, or (c) a combined operation, depending on the sys-
tem purchased.
Model 3980-1 stabilized ps frequency doubling only
Model 3980-2 ps pulse selection capability only
Model 3980-3 combines the functions of the 3980–1 and 3980–2
Model 3980-4 fs frequency doubling only
Model 3980-5 ps or fs pulse selection capability only
Model 3980-6 combines the capability of the 3980-4 and 3980-5
A “B” or “S” indicates that optics and crystal are included for frequency-
doubled operation from 690 to 840 nm, and “M” indicates that optics and
crystal are included for frequency-doubled operation from 840 to 1080 nm.
Models 3980-2S and -5S contain all the required components for pulse
selection over the entire 690 to 1080 nm region for ps and fs operation
respectively.
The Model 3986 electronics module contains a heater control for the fre-
quency doubler and the electronics for the pulse selector. This unit is used
with -2, -3, -5 and -6 systems. The Model 3983 electronics module contains
only a heater control and is used with the -1 system. The -4 system requires
no electronics.
For more information on model availability or for special requirements,
please call your Spectra-Physics service representative.

Model 3980 Frequency Doubler/Pulse Selector
1-4

2-1
Chapter 2 Laser Safety
Precautions for the Safe Operation of
Class IV-High Power Lasers
• Wear protective eyewear at all times; selection depends on the wave
length and intensity of the radiation, the conditions of use, and the
visual function required. Protective eyewear is available from vendors
listed in the Laser Focus World, Lasers and Optronics, and Photonics
Spectra buyer's guides. Consult the ANSI or ACGIH standards listed at
the end of this section for guidance.
• Keep the protective cover on the Model 3980 at all times.
• Avoid looking at the output beam; even diffuse reflections are hazardous.
• Avoid wearing jewelry or other objects that may reflect or scatter the
beam while using the laser.
• Use an infrared detector or energy detector to verify that the laser
beam is off before working in front of the laser or the Model 3980.
• Operate the laser at the lowest beam intensity possible, given the
requirements of the application.
• Expand the beam whenever possible to reduce beam power density.
• Avoid blocking the output beam or its reflection with any part of your
body.
• Establish a controlled access area for laser operation. Limit access to
those trained in the principles of laser safety.
• Post prominent warning signs near the laser operation area (Figure 2-1).
The Tsunami laser and its pump laser are Class IV—High Power Lasers,
whose beams are, by definition, safety and fire hazards. This also
applies to the beam from the Model 3980 frequency doubler/pulse selec-
tor. Take precautions to prevent exposure to both direct and reflected
beams. Diffuse as well as specular reflections cause severe skin or eye
damage.
Danger!
Laser Radiation
Invisible and short-pulse laser radiation present! The Model 3980 fre-
quency doubler/pulse selector emits visible and invisible short-pulse
radiation that is extremely dangerous to the eye. Infrared radiation, in
particular, passes easily through the cornea, which focuses it on the ret-
ina, where it can cause instantaneous permanent damage.
Danger!
Laser Radiation

Model 3980 Frequency Doubler/Pulse Selector
2-2
• Set up experiments so the laser beam is either above or below eye
level.
• Provide enclosures for beam paths whenever possible.
• Set up shields to prevent specular reflections.
• Set up an energy absorbing target to capture the laser beam, preventing
unnecessary reflections or scattering (Figure 2-2).
• Maintain a high ambient light level in the laser operation area. This
keeps the eye's pupil constricted, thus reducing the possibility of eye
damage.
Figure 2-1: These CE and CDRH standard safety warning labels would
be appropriate for use as entry warning signs (EN 60825-1, ANSI 4.3.10.1).
Figure 2-2: Folded Metal Beam Target
Follow the instructions contained in this manual and your laser manuals for
safe operation of your laser system. At all times during operation, mainte-
nance, or service of your laser system, avoid unnecessary exposure to laser
or collateral radiation*that exceeds the accessible emission limits listed in
“Performance Standards for Laser Products,” United States Code of Fed-
eral Regulations, 21CFR1040 10(d).
*Any electronic product radiation, except laser radiation, emitted by a laser product as a
result of, or necessary for, the operation of a laser incorporated into that product.
VISIBLE AND/OR INVISIBLE*
LASER RADIATION
AVOID EYE OR SKIN EXPOSURE TO DIRECT OR
SCATTERED RADIATION
CLASS 4 LASER PRODUCT
POWER, WAVELENGTH(S) AND PULSE WIDTH
DEPEND ON PUMP OPTIONS AND LASER
CONFIGURATION.
*SEE MANUAL 0451-8080
DANGER
VISIBLE AND/OR INVISIBLE
LASER RADIATION
AVOID EYE OR SKIN EXPOSURE TO
DIRECT OR SCATTERED RADIATION
POWER, WAVELENGTH AND
PULSE WIDTH DEPEND ON PUMP
OPTIONS AND LASER CONFIGURATION*
CLASS IV LASER PRODUCT
SEE
MANUAL
*
Use of controls or adjustments, or the performance of procedures other
than those specified herein may result in hazardous radiation exposure.
Danger!