Newport CONEX-PSD User manual

Two-Axis Position
& Power Sensing Device
User’s Manual
CONEX-PSD

CONEX-PSD Two-Axis Position & Power Sensing Device
Warranty
Newport Corporation warrants that this product will be free from defects in material and
workmanship and will comply with Newport’s published specifications at the time of
sale for a period of one year from date of shipment. If found to be defective during the
warranty period, the product will either be repaired or replaced at Newport's option.
To exercise this warranty, write or call your local Newport office or representative, or
contact Newport headquarters in Irvine, California. You will be given prompt assistance
and return instructions. Send the product, freight prepaid, to the indicated service
facility. Repairs will be made and the instrument returned freight prepaid. Repaired
products are warranted for the remainder of the original warranty period or 90 days,
whichever comes first.
Limitation of Warranty
The above warranties do not apply to products which have been repaired or modified
without Newport’s written approval, or products subjected to unusual physical, thermal
or electrical stress, improper installation, misuse, abuse, accident or negligence in use,
storage, transportation or handling. This warranty also does not apply to fuses, batteries,
or damage from battery leakage.
THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR
IMPLIED, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY
OR FITNESS FOR A PARTICULAR USE. NEWPORT CORPORATION SHALL
NOT BE LIABLE FOR ANY INDIRECT, SPECIAL, OR CONSEQUENTIAL
DAMAGES RESULTING FROM THE PURCHASE OR USE OF ITS PRODUCTS.
Copyright 2016 by Newport Corporation, Irvine, CA. All rights reserved. No part of
this manual may be reproduced or copied without the prior written approval of Newport
Corporation. This manual is provided for information only, and product specifications
are subject to change without notice. Any change will be reflected in future printings.
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CONEX-PSD Two-Axis Position & Power Sensing Device
Table of Contents
Waranty ............................................................................................................................ii
EU Declaration of Conformity .........................................................................................v
Preface.............................................................................................................................vi
1.0 Introduction .................................................................................................. 1
1.1 Definitions and Symbols ....................................................................................................1
1.1.1 General Warning or Caution .................................................................................1
1.1.2 The Exclamation Symbol in General Warning or Caution....................................1
1.1.3 Electric Shock .......................................................................................................1
1.1.4 The Electrical Shock Symbol in Electric Shock....................................................1
1.1.5 European Union CE Mark.....................................................................................2
1.2 Warnings and Cautions ......................................................................................................2
1.3 General Warnings and Cautions.........................................................................................2
2.0 General Description...................................................................................... 3
2.1 Part Number .......................................................................................................................3
2.2 Dimensions.........................................................................................................................3
2.2.1 Silicon Sensor........................................................................................................3
2.2.2 Germanium Sensor................................................................................................3
2.3 System Environmental Specifications................................................................................4
2.4 Sensor Characteristics ........................................................................................................4
2.4.1 Silicon Sensor........................................................................................................4
2.4.2 Germanium Sensor................................................................................................5
2.5 Sensor Care ........................................................................................................................6
3.0 Functional Description ................................................................................. 7
3.1 Principle .............................................................................................................................7
3.2 Sensors Outputs..................................................................................................................7
3.3 Beam Size Considerations..................................................................................................7
3.3.1 Max. Size...............................................................................................................7
3.3.2 Min. Size ...............................................................................................................7
3.4 Beam Energy/Power Considerations..................................................................................8
3.4.1 Max. Power ...........................................................................................................8
3.4.2 Max. Density .........................................................................................................8
3.4.3 Max. Energy..........................................................................................................8
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CONEX-PSD Two-Axis Position & Power Sensing Device
4.0 Optimizing Measurements........................................................................... 9
4.1 Avoid Stray Light...............................................................................................................9
4.1.1 Shielding the Sensor..............................................................................................9
4.1.2 Filtering and Attenuation.......................................................................................9
4.2 Optimizing Controller Parameters....................................................................................10
4.2.1 Offset...................................................................................................................10
4.2.2 Gain (-1 – +1)......................................................................................................11
4.2.3 Frequency (LF 0-1000) .......................................................................................11
5.0 Appendix: Firmware Version V2.2.x........................................................ 12
OF — Set/Get offset on ADC inputs 1 to 4....................................................................13
Service Form ........................................................................................................ 15
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CONEX-PSD Two-Axis Position & Power Sensing Device
EU Declaration of Conformity

CONEX-PSD Two-Axis Position & Power Sensing Device
Preface
Documentation Organization
CONEX-PSD documentation set includes 2 parts:
•Sensor Manual (this document) describing sensor features and measurement
optimization.
•Controller Manual describing available commands.
Confidentiality & Proprietary Rights
Reservation of Title
The Newport Programs and all materials furnished or produced in connection with them
("Related Materials") contain trade secrets of Newport and are for use only in the
manner expressly permitted. Newport claims and reserves all rights and benefits
afforded under law in the Programs provided by Newport Corporation.
Newport shall retain full ownership of Intellectual Property Rights in and to all
development, process, align or assembly technologies developed and other derivative
work that may be developed by Newport. Customer shall not challenge, or cause any
third party to challenge, the rights of Newport.
Preservation of Secrecy and Confidentiality and Restrictions to Access
Customer shall protect the Newport Programs and Related Materials as trade secrets of
Newport, and shall devote its best efforts to ensure that all its personnel protect the
Newport Programs as trade secrets of Newport Corporation. Customer shall not at any
time disclose Newport's trade secrets to any other person, firm, organization, or
employee that does not need (consistent with Customer's right of use hereunder) to
obtain access to the Newport Programs and Related Materials. These restrictions shall
not apply to information (1) generally known to the public or obtainable from public
sources; (2) readily apparent from the keyboard operations, visual display, or output
reports of the Programs; (3) previously in the possession of Customer or subsequently
developed or acquired without reliance on the Newport Programs; or (4) approved by
Newport for release without restriction.
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CONEX-PSD Two-Axis Position & Power Sensing Device
Sales, Tech Support & Service
North America & Asia
Newport Corporation
1791 Deere Ave.
Irvine, CA 92606, USA
Sales
Tel.: [phone]
e-mail: [e-mail]
Technical Support
Tel.: [phone]
e-mail: tec[email protected]m
Service, RMAs & Returns
Tel.: [phone]
e-mail: [e-mail]
Europe
MICRO-CONTROLE Spectra-Physics S.A.S
9, rue du Bois Sauvage
91055 Évry CEDEX
France
Sales France
Tel.: [phone]
e-mail: [email protected]
Sales Germany
Tel.: [phone] / 708 – 0
e-mail: [e-mail]
Sales UK
Tel.: [phone]
e-mail: [e-mail]
Technical Support
e-mail: [e-mail]
Service & Returns
Tel.: [phone]
Maintenance
The CONEX-PSD Controller/Driver should only be cleaned with a lightly damped cloth
or sponge with a soapy water solution. Do not use an acetone or alcohol solution; this
will damage the finish of the enclosure.
Service Information
The user should not attempt any maintenance or service of the CONEX-PSD
Controller/Driver and its accessories beyond the procedures outlined in this manual.
Any problem that cannot be resolved should be referred to Newport Corporation. When
calling Newport regarding a problem, please provide the Tech Support representative
with the following information:
•Your contact information.
•System serial number or original order number.
•Description of problem.
•Environment in which the system is used.
•State of the system before the problem.
•Frequency and repeatability of problem.
•Can the product continue to operate with this problem?
•Can you identify anything that may have caused the problem?
Complete a copy of the Service Form as represented at the end of this document and
include it with your shipment.
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CONEX-PSD Two-Axis Position & Power Sensing Device
Newport Corporation RMA Procedures
Any CONEX-PSD Controller/Driver being returned to Newport must have been
assigned an RMA number by Newport. Assignment of the RMA requires the item serial
number.
Packaging
CONEX-PSD Controller/Driver being returned under an RMA must be securely
packaged for shipment. If possible, reuse the original factory packaging.
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CONEX-PSD Two-Axis Position & Power Sensing Device
CONEX-PSD
Two-axis Position and Power Sensing Device
1.0 Introduction
1.1 Definitions and Symbols
The following terms and symbols are used in this documentation and also appear on the
CONEX-PSD Controller/Driver where safety-related issues occur.
1.1.1 General Warning or Caution
Figure 1: General Warning or Caution Symbol.
1.1.2 The Exclamation Symbol in General Warning or Caution
Figure 1 may appear in Warning and Caution tables in this document. This symbol
designates an area where personal injury or damage to the equipment is possible.
1.1.3 Electric Shock
Figure 2: Electrical Shock Symbol.
1.1.4 The Electrical Shock Symbol in Electric Shock
Figure 2 may appear on labels affixed to the CONEX-PSD Controller/Driver. This
symbol indicates a hazard arising from dangerous voltage. Any mishandling could
result in irreparable damage to the equipment, in personal injury, or death.
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CONEX-PSD Two-Axis Position & Power Sensing Device
1.1.5 European Union CE Mark
Figure 3: CE Mark.
The presence of the CE Mark on Newport Corporation equipment means that it has
been designed, tested and certified as complying with all applicable European Union
(CE) regulations and recommendations.
1.2 Warnings and Cautions
The following are definitions of the Warnings, Cautions and Notes that may be used in
this manual to call attention to important information regarding personal safety, safety
and preservation of the equipment, or important tips.
WARNING
Situation has the potential to cause bodily harm or death.
CAUTION
Situation has the potential to cause damage to property or
equipment.
NOTE
Additional information the user or operator should consider.
1.3 General Warnings and Cautions
The following general safety precautions must be observed during all phases of
operation of this equipment.
Failure to comply with these precautions or with specific warnings elsewhere in this
manual violates safety standards of design, manufacture, and intended use of the
equipment.
•Heed all warnings on the unit and in the operating instructions.
•To prevent damage to the equipment, read the instructions in this manual.
•Route power cords and cables where they are not likely to be damaged.
•Keep air vents free of dirt and dust.
•Keep liquids away from unit.
•Do not expose equipment to excessive moisture (>85% humidity)
•Do not operate this equipment in an explosive atmosphere.
•Disconnect power before cleaning the CONEX-PSD unit. Do not use liquid or
aerosol cleaners.
•Do not open the CONEX-PSD Controller. There are no user-serviceable parts
inside.
•Return equipment to Newport Corporation for service and repair.
•Follow precautions for static-sensitive devices when handling electronic circuits.
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CONEX-PSD Two-Axis Position & Power Sensing Device
2.0 General Description
2.1 Part Number
Product Description
PSD9-SI 9 x 9 mm sensor for wavelength from 320 to 1100 nm
PSD10-GE 10 x 10 mm sensor for wavelength from 800 to 1700 nm
2.2 Dimensions
2.2.1 Silicon Sensor
2.2.2 Germanium Sensor
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CONEX-PSD Two-Axis Position & Power Sensing Device
2.3 System Environmental Specifications
Operating temperature 5 °C to 40 °C
Operating humidity 20% to 85% relative humidity, non-condensing
Location Indoor use only
2.4 Sensor Characteristics
NOTE
The values are estimated based on the sensor manufacturer’s typical values at
ambient temperature. They are not calibrated to each unit.
2.4.1 Silicon Sensor
2.4.1.1 Absolute Maximum Rating (Ta = 25 °C)
Parameter
Symbol
Value
Unit
Reverse Voltage
VRMax.
20
V
Operating Temperature
Topr
-20 to + 60
°C
Storage Temperature
Tstg
-20 to + 80
°C
2.4.1.2 Electrical and Optical Characteristics (Ta = 25 °C)
Parameter
Symbol
Condition
Min.
Typ.
Max.
Unit
Spectral response
range λ–
320
to
1100
– Nm
Peak sensitivity
wavelength
λp – 960 – Nm
Photo sensitivity
S
λ= λp
–
0.6
–
A/W
Interelectrode
resistance
Rie Vb = 0.1 V 5 7 15 kΩ
Position detector
error E
λ= 900 nm
VR= 5 V
Spot size = 0.2 mm
– ±150 ±250 µm
Dark current
ID
VR=5V
–
1
50
nA
Saturation
photocurrent
Ist
λ= 900 nm
VR= 5 V
RL = 1 kΩ
– 500 – µA
Rise time
tr
–
2
–
µs
Terminal
capacitance
Ct
V
R
= 5 V
F = 10 kHz
– 500 1000 pF
Position
resolution
∆R
IO = 1 µA
F = 10 kHz
– 1.5 – µm
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CONEX-PSD Two-Axis Position & Power Sensing Device
2.4.1.3 Wavelength Consideration
Power/Wavelength
Responsivity/Wavelength
2.4.2 Germanium Sensor
2.4.2.1 Electrical and Optical Characteristics (Ta = 25 °C)
Parameter
Symbol
Condition
Min.
Typ.
Max.
Unit
Spectral response
range λ–
800
to
1700
– nm
Peak sensitivity
wavelength
λp – 1550 – nm
Photo sensitivity
S
λ= λp
–
0.9
–
A/W
Interelectrode
resistance
Rie 100 Ω
Shunt resistance
1
2
kΩ
Shunt
capacitance
30 nF
Position
resolution
∆R F = 136 Hz – 5 – µm
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CONEX-PSD Two-Axis Position & Power Sensing Device
2.4.2.2 Wavelength Consideration
The sensor should be operated with beam power between 0.1mW and 1mW.
Nonlinearities and saturation can occur above 1mW.
2.5 Sensor Care
The input window is coated with a soft silicone resin. Avoid touching the
window to keep grime from accumulating or prevent surface damage that can
decrease the PSD's sensitivity. External force applied to the resin surface may
deform or cut off the wires.
WARNING
DO NOT TOUCH SENSOR WINDOW.
Silicone resin swells when it absorbs organic solvents, so do not use any solvent other
than Alcohol.
WARNING
USE ONLY ALCOHOL TO CLEAN SENSOR WINDOW.
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CONEX-PSD Two-Axis Position & Power Sensing Device
3.0 Functional Description
3.1 Principle
Position Sensing Devices (PSDs) consist of a p-n junction photodiode in which
two sides of the junction have electrically separate contacts.
X, Y positions returned by the Get Position GP command are given according to the
above referential.
3.2 Sensors Outputs
For Si sensor, the cut-off frequency is at 319 Hz.
For Ge sensor, the cut-off frequency is at 136 Hz..
3.3 Beam Size Considerations
3.3.1 Max. Size
For best measurement quality, the beam should remain within the sensitive area (9 x 9
mm for Si, 10 x 10mm for Ge). If the beam is moving during measurement (∆X, ∆Y),
its size should be reduced using the following formula:
Maximum Beam size for Si: BSx= 9 mm – ∆X and BSY= 9 mm – ∆Y
Maximum Beam size for Ge: BSx= 10 mm – ∆X and BSY= 10 mm – ∆Y
3.3.2 Min. Size
To maintain measurements quality, it is recommended to use a beam size ≥0.2mm
WARNING
MINIMUM BEAM SIZE: 0.2 mm.
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CONEX-PSD Two-Axis Position & Power Sensing Device
3.4 Beam Energy/Power Considerations
3.4.1 Max. Power
The maximum acceptable total beam power depends on the Wavelength.
The maximum current generated by the sensor is 0.5 mA for Si and 1mA for Ge.
In case of higher beam power, it is possible to mount Newport neutral density filter such
as model “FBR-NDxx” on the Newport “Model 883-OH 1" filter holder.
3.4.2 Max. Density
The maximum acceptable beam intensity is limited by the device itself: 30mw/mm2.
WARNING
MAXIMUM BEAM POWER DENSITY:30 mW/mm2.
3.4.3 Max. Energy
Although PSD sensors are mostly used to check continuous lasers, they can be used to
check the average power of pulsed laser.
However, high energy, short pulses beam might damage the sensor. It is strongly
recommended to NOT exceed the following values:
•Beam size: ≥1 mm2.
•Beam power: ≤1mW.
•Repetition rate: ≥10 kHz.
•Pulse duration: ≥5 ns.
WARNING
DO NOT USE TOO SHORT,TOO HIGH ENERGY PULSES.
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CONEX-PSD Two-Axis Position & Power Sensing Device
4.0 Optimizing Measurements
This section provides general recommendations for improving light measurement
setups.
4.1 Avoid Stray Light
As the sensitive area of a PSD is relatively large (81 mm2for Si, 100mm² for Ge), it
may collect unwanted light on top of the beam being measured. This may affect the
measurement accuracy.
PSD’s are also sensitive to a large spectral range (300 to 1100 nm for Si and 800 to
1700 for Ge). Although the light to be measured might be centered on one particular
wavelength, sensor will be affected by other wavelengths.
For example, stray light can easily reach 10 μW/mm2on a broad spectral range in a
room. This might not be negligible, especially if a large gain was set in the controller.
There are 2 ways to minimize the effect of stray light:
•Shield the sensor from unwanted light.
•Block the unwanted wavelength.
4.1.1 Shielding the Sensor
To minimize this effect, it is recommended to shield the sensor from stray light.
One or several Newport filter holders can be used for that.
4.1.2 Filtering and Attenuation
Several types Newport filter can be mounted on the Newport “Model 883-OH 1" filter
holder.
For example:
Absorptive Neutral Density Filter (FSR-xxxx):
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CONEX-PSD Two-Axis Position & Power Sensing Device
Or Bandpass Filter (10BPFx-y):
Or Mercury Line Filter (10MLFx-y):
NOTE
Keep in mind to take filter attenuation into account in the measurements.
4.2 Optimizing Controller Parameters
4.2.1 Offset
Controller offset can be used to compensate for stray light. Proceed as follows:
•Prepare your optical setup.
•Turn the beam OFF.
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CONEX-PSD Two-Axis Position & Power Sensing Device
•Using an application software or Windows HyperTerminal (see CONEX-PSD
Controller Documentation) set all gains to 1 with the following commands:
o“1PX1”
o“1PY1”
o“1PS1”
•Use the 1RA? command to get the current offsets.
•On PSD9 silicon, this command will return 3 parameters: OX, OY, OS (in volts).
Set the offsets using the following commands:
o“1IXnn” with nn = OX value
o“1IYnn” with nn = OY value
o“1ISnn” with nn = OS value
•On PSD10Ge, this command will return 4 parameters : offset1, offset2, offset3,
offset4 (in volts).
Set the offsets using the following commands:
o“1OFaa,bb,cc,dd” with aa = offset1 value, bb = offset2 value, cc = offset3 value
and dd = offset4 value
Those 4 values correspond to electrical offsets. For optical offset compensation and
full scale adjustment (section below), use OX/PX and OY/PY commands to
compensate X and Y positions and scalings.
•Using the command “1GP?”, verify that the corrected positions and power are set to
0.
•Turn the beam to be measured ON.
•Using the command “1GP?”, read your beam position and power level.
4.2.2 Gain (-1 – +1)
To facilitate measurements, a gain can be used to modify the reported value of position
and power.
For example:
•To change the sign of beam X position, use “1PX-1”.
•To change beam position unit from mm (default) to inches, use “1PX0.0393”.
4.2.3 Frequency (LF 0-1000)
CONEX-PSD sensor features an analog filter with a fixed cut-off frequency of 319 Hz
for Si sensor and 136 for Ge sensor.
This allows an average power measurement for pulsed lasers.
An additional programmable low pass filter can be set to increase noise immunity (such
as the 100~120 Hz coming from room fluorescent lights) using the command: “1LF80”.
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CONEX-PSD Two-Axis Position & Power Sensing Device
5.0 Appendix: Firmware Version V2.2.x
Not every command can be executed in all states of the CONEX-PSD and some
commands have different meaning in different states. It is therefore important to
understand the state diagram of the controller, see section
Ready Config. Description
GP


Get X, Y positions and laser power
ID Set/Get stage identifier
IS


Set/Get Set/Get offset on ADC input Sum (Si sensor)
Not used (Ge sensor)
IX


Set/Get offset on ADC input X (Si sensor)
Set/Get offsets on X position (Ge sensor)
IY


Set/Get offset on ADC input Y (Si sensor)
Set/Get offsets on Y position. (Ge sensor)
LF Set/Get low pass filter frequency
OF Not used (Si sensor)
Set/Get offset on ADC inputs 1 to 4 (Ge sensor)
PS


Set/Get gain on ADC input Summ (Si sensor)
Not used (Ge sensor)
PX


Set/Get gain on ADC input X
Set/Get gain on X position (Ge sensor)
PY


Set/Get gain on ADC input Y (Si sensor)
Set/Get gain on Y position. (Ge sensor)
PW Enter/Leave CONFIGURATION state
RA Get raw analog input values
RC


Get corrected analog input values
RS Reset controller
RS## Reset controller’s address to 1
SA – Set/Get controller’s address
TB Get command error string
TE Get last command error
TS Get positioner error and controller state
VE Get controller revision information
Changes configuration parameters. Those changes will be stored in the
controller’s memory with the PW1 command and remain available after
switching off the controller.
Changes working parameters only. Those changes will get lost when switching
off the controller.
Accepted command.
–Write command not accepted (will return an error).
Command Command passed without preceding controller number applies to all controllers.
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