THORLABS SL1310V1 Series User manual

SL1310V1 Series
MEMS-VCSEL Swept Laser
User Guide

Table of Contents
Chapter 1 Warning Symbol Definitions ..........................................................................................2
Chapter 2 Safety................................................................................................................................3
Chapter 3 Description.......................................................................................................................5
3.1. Basic Operation...............................................................................................................5
3.2. Port Descriptions ............................................................................................................5
3.3. Front and Back Panel Overview.....................................................................................8
3.4. Packing List .....................................................................................................................9
Chapter 4 General Operation .........................................................................................................10
4.1. User Interface ................................................................................................................10
4.2. Laser Operation.............................................................................................................11
4.2.1. Turning ON the Laser..........................................................................................................11
4.2.2. Turning Off the Laser ..........................................................................................................12
4.2.3. Daily operation ....................................................................................................................12
4.2.4. Adjusting the Polarization Controllers .................................................................................13
Chapter 5 Care and Maintenance ..................................................................................................14
5.1. Maintenance: Optical Cleaning ....................................................................................15
5.2. Service............................................................................................................................15
5.3. Accessories and Customization .................................................................................. 15
Chapter 6 Specifications ................................................................................................................16
Chapter 7 Trouble Shooting........................................................................................................... 17
Chapter 8 Certificate of Compliance .............................................................................................18
Chapter 9 Regulatory......................................................................................................................19
Chapter 10 Thorlabs Worldwide Contacts......................................................................................20

MEMS-VCSEL Swept Laser Chapter 1: Warning Symbol Definitions
22797-D02, Rev B, May 13, 2014 Page 2
Chapter 1 Warning Symbol Definitions
Below is a list of warning symbols you may encounter in this manual or on your device.
Symbol Description
Direct Current
Alternating Current
Both Direct and Alternating Current
Earth Ground Terminal
Protective Conductor Terminal
Frame or chassis Terminal
Equipotentiality
On (Supply)
Off (Supply)
In Position of a Bi-Stable Push Control
Out Position of a Bi-Stable Push Control
Caution, Risk of Electric Shock
Caution, Hot Surface
Caution, Risk of Danger
Warning, Laser Radiation
Caution, Spinning Blades May Cause Harm

MEMS-VCSEL Swept Laser Chapter 2: Safety
22797-D02, Rev B, May 13, 2014 Page 3
Chapter 2 Safety
ATTENTION! Important User Information
Please read the instruction manual carefully before operating the MEMS-VCSEL Swept Laser.
All statements regarding safety and technical specifications will only apply when the unit is
operated correctly.
Check the supply voltage of the system before plugging in the Swept Laser. Make sure the
included power cord for the Swept Laser is connected to a properly grounded
power outlet (100 – 240 VAC; 50 – 60 Hz).
Transportation and delivery may cause the Swept Laser to be warm or cool upon receipt. Please
wait for the unit to reach room temperature before attempting to operate.
Use a flat, dry, and stable surface to set up the system.
WARNING! High Voltage
Before applying power to your system, make sure that the protective conductor of the 3 conductor
mains power cord is correctly connected to the protective earth contact of the socket outlet.
Improper grounding can cause electric shock resulting in severe injury or even death!
Make sure that the line voltage rating agrees with your local supply and that the appropriate fuse
is installed.
Do not remove cover; there are no user serviceable parts inside. Do not operate without cover
installed. To avoid electrical shock the power cord protective grounding conductor must be
connected to ground. Refer servicing to qualified personnel.
WARNING! Laser Radiation
Do not, under any circumstances look into the optical output when the unit is operating.
The laser radiation is from 1200 to 1400 nm and is not visible to the human eye, but it can
seriously damage your eyesight. Do not look into the aperture. Do not look into the end of the
fiber. Only view the end of the fiber through a fiber scope when the system is off and unplugged
to ensure there is no exposure to laser light.
LASER RADIATION
DO NOT VIEW DIRECTLY WITH
OPTICAL INSTRUMENTS
CLASS 1M LASER PRODUCT
! !

MEMS-VCSEL Swept Laser Chapter 2: Safety
22797-D02, Rev B, May 13, 2014 Page 4
WARNING! Electrostatic Discharge (ESD)
All types of electronic components, particularly integrated circuits, are sensitive to Electrostatic
Discharge (ESD). ESD is a general reason for failure of electronic equipment. The total operating
time can be reduced if precautions against ESD-damage are not taken.
ALWAYS wear an ESD wrist strap connected to the ESD terminal whenever handling the swept
source. See Figure 2.
Figure 1 ESD wrist wrap. The wrist strap is connected to ground to ensure that no electrostatic field
is built up.
CAUTION
Do not obstruct air-ventilation into the bottom of the swept source engine or out of the exhaust
fan on the rear of the unit!
Mobile telephones, cellular phones or other radio transmitters are not to be used within the range
of three meters of this unit since the electromagnetic field intensity may exceed the maximum
allowed disturbance values according to EN50082-1.
WARNING! Important Warranty Information
Do not open the unit under any circumstance.
There are no user serviceable parts in this product. Opening the device will void your warranty.
Any modification or servicing of this system by unqualified personnel renders Thorlabs free of
any liability.
CAUTION! Packing and Return Information
This device can only be returned when packed into the complete original packaging, including all
foam packing inserts. If necessary, ask for replacement packaging.
!!
! !
! !
!
!

MEMS-VCSEL Swept Laser Chapter 3: Description
22797-D02, Rev B, May 13, 2014 Page 5
Chapter 3 Description
The SL1310V1 MEMS-VCSEL Swept Laser is a benchtop swept laser source designed for swept-source optical
coherence tomography (SS-OCT) applications. This source is based on a proprietary microelectromechanical
system vertical cavity surface emitting laser (MEMS-VCSEL) design. The SL1310V1 benchtop swept laser source
rapidly sweeps across a broad tuning range centered around 1300 nm. Integrated drive electronics are optimized
for broadband unidirectional sweeping with a highly linear trajectory. The source also includes a Mach Zehnder
interferometer “k-clock” for optical clocking data acquisition.
3.1. Basic Operation
Figure 2 Schematic of the MEMS-VCSEL Swept Laser
The figure above shows the diagram of the MEMS-VCSEL swept laser, where the blue path represents single
mode fiber and the black path represents electric connections. The MEMS-VCSEL swept laser consists of a
MEMS-VCSEL cavity, a booster optical amplifier (BOA), a fiber-optic monitoring network and signal generation
circuits. The cavity module includes a vertical-cavity surface-emitting laser (VCSEL) with a micro-
electromechanical system (MEMS) actuator to tune the emission wavelength. The optical output of the MEMS-
VCSEL cavity is connected to the optical input of the BOA. A polarization controller (PC1) is used to control the
polarization states of the light in the fiber when entering the BOA. Another polarization controller (PC2) is used to
control the output fiber polarization before the main laser output.
3.2. Port Descriptions
The laser aperture is the main optical output port of the laser. It is designed to use with SMF-28 single mode fiber
with FC/APC connector. Fibers must be cleaned and inspected before connecting to this port.
A number of monitoring photodiodes and signals are provided:
1. The Cavity Monitor signal is from the MEMS-VCSEL cavity before the BOA amplification. It is mainly
used for diagnostic purpose; the user does not need to monitor this signal for normal operation of the
laser. This signal can be accessed on the back panel of the laser and is designed to drive a 50 Ohm load.
MEMS VCSEL
Cavity
Monitoring
Photodiode
Input Optical
Isolator
Output Optical
Isolator
Polarization
Controller 1
Polarization
Controller 2 Laser
Aperture
Monitoring
Photodiode
DAQ
k-Clock
Laser
Monitor
Cavity
Monitor
DAQ Sweep
Trigger
Booster
Optical
Amplifier
(BOA)
MZI Clock
Module
(FC/APC)
(SMA)
λ Sweep
Trigger
(SMA)(SMA)(SMA)(SMA)
(PC1) (PC2)

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ated for eac
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erted into di
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o
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g
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ut waveleng
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y internal de
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cted to the
“
n
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a
velengths.
T
a
d.
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ration of the
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o
a
n synchroni
z
can be used
c
illoscope or
s
igned to dri
v
m
the MEMS
-
G
reen, Cavit
y
A
ll signals ar
e
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Mach-Zehnd
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h and gene
r
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n
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ection circui
t
“
external clo
c
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signal whic
h
T
his signal ca
n
re for autom
a
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ents the ma
i
laser. Becau
n controller
s
o
n the back p
z
ation signal.
for OCT me
a
a data acqui
s
v
e 50 Ohm lo
a
-
VCSEL sw
e
y
intensity si
g
e
50 Ohm ter
m
required for
n
e
r interferom
e
r
ate interfere
n
n
for the sw
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t
s and can b
e
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gned to driv
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consists of
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be access
e
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tically switc
h
Chapter 3:
D
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n output of t
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se the BOA
i
s
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The rising e
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suremen
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ormal opera
t
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ter (MZI) int
e
n
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g
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pt laser. Th
e
used as th
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data acquis
i
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50 Ohm loa
d
single pulse
s
e
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s
D
escription
Page 6
h
e laser. It
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nput fiber
d
justed to
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d
ge of this
T
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w, Laser
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nals with
ese zero-
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s
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c
g
si
g
nals fro
m
o
nd to the foll
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lock signals
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-
owing: (1) D
A
(purple). All
s
-
VCSEL sw
e
A
Q sweep tri
g
s
ignals are 5
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pt laser on
d
g
ger signal (
r
0
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Chapter 3:
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ifferent tim
e
r
ed); (2) Las
e
ated.
D
escription
Page 7
e
scales
e
r intensity

MEMS-VCSEL Swept Laser Chapter 3: Description
22797-D02, Rev B, May 13, 2014 Page 8
3.3. Front and Back Panel Overview
Figure 5 SL1310V1 MEMS-VCSEL Laser front view
Figure 6 SL1310V1 MEMS-VCSEL Laser back view
Not Used
Laser On
Indicato
r
Not Used
Not Used
System Ready
Indicator
Power Switch
Power On Indicator
Over or Under
Tem
p
Indicator
Laser Enable
Button
Cavity Intensit
y
Monito
r
SM
A
DAQ Trigge
r
BNC
Laser Intensit
y
Monito
r
BNC
Line Cord
Output Polarization
Controller Adjustment
Knobs
Input Polarization
Controller Adjustment
Knobs
USB Port
Not Used
DAQ k-Clock
Laser Output
FC/APC
λSweep
Trigge
r
SM
A
Interlock
Connector
Fuse Tray

MEMS-VCSEL Swept Laser Chapter 3: Description
22797-D02, Rev B, May 13, 2014 Page 9
3.4. Packing List
The MEMS-VCSEL Swept Laser system is a self-contained laser system; it does not need any additional
equipment, instrument, or controls in order to operate. Please refer to the packing list below to ensure that the
system is complete. If any item is missing or damaged, contact Thorlabs for assistance.
Components Quantity
Swept Source Engine 1
Power Cord, US Only 1
Manual 1

MEMS-VCSEL Swept Laser Chapter 4: General Operation
22797-D02, Rev B, May 13, 2014 Page 10
Chapter 4 General Operation
4.1. User Interface
The swept laser is controlled using the three switches located on the front panel. The power switch controls the
main power and must be turned on to operate the laser, the two enable buttons activates the laser and initiates
unidirectional sweeping, respectively.
The Power Switch
The POWER switch applies AC power to the entire unit when set to the ON position. The POWER ON indicator
will illuminate when power is applied.
The Laser Enable Button
The LASER ENABLE button enables the laser output. The LASER ON indicator will illuminate when the laser is
fully enabled. Pressing the LASER ENABLE button when the laser is already on will turn the laser off and the
corresponding indicator will turn off.
The Scan Mode Button
The SCAN MODE button enables the laser to lase in unidirectional scan mode. The laser produces a fast scan
and a slow scan during each round-trip cycle of the MEMS actuator. The SL1310V1 is optimized for unidirectional
scanning. This mode outputs laser light only during the slow scan. In bi-directional scan mode, the outputs of both
the fast scan and slow scan are provided. It is recommended to use only the slow scan because the required
signal detection bandwidth is much lower than using the fast scan. Currently, the SCAN MODE button is
disabled and unidirectional mode is used as default setting.
Indicators
The POWER ON indicator will illuminate when power is applied.
The UNI indicator turns on when the power is applied and system meets all necessary conditions for operation.
This indicator always remains on during laser operation.
The LASER ON indicator will illuminate when the laser is enabled. The LASER ON indicator will blink while the
laser is reaching steady-state conditions.
The SYS OK indicator will turn on when all necessary conditions are met for proper operation of the unit. The
laser cannot be enabled until the SYS OK indicator turns on.
The TEMP indicator will turn on under the following conditions:
1. the internal temperature of the enclosure exceeds approximately 60 °C,
2. the heat sink temperature of the laser driver exceeds a maximum temperature, or,
3. the thermo-electric cooling (TEC) system has not attained its set operating temperature – as would be the
case when turning on a cold unit.
If the laser is enabled and a temperature alarm causes the TEMP indicator to turn on, the laser and TEC system
will automatically shut down. Once the unit returns to a normal operating temperature the TEC system will
automatically restart. The laser and unidirectional scan mode must be manually re-enabled.

MEMS-VCSEL Swept Laser Chapter 4: General Operation
22797-D02, Rev B, May 13, 2014 Page 11
4.2. Laser Operation
4.2.1. Turning ON the Laser
The following turn ON procedure is required for proper operation of the laser:
1. Start the swept laser by switching on the power switch to the ON position. All the green LEDs on the front
panel turn green for about 5 seconds while the system performs a self-test as show in Figure 7.
Figure 7 Swept laser turn ON step 1: Power Switch.
The TEMP indicator will remain green until the temperature of the system is stable. Note that this can take
longer than 60 seconds if the system starts up from a very cold state.
Figure 8 Swept laser warming up.
2. Wait until the SYS OK indicator turns green, the TEMP indicator should turn off as shown in Figure 9.
Figure 9 Swept laser ready to be enabled.

MEMS-VCSEL Swept Laser Chapter 4: General Operation
22797-D02, Rev B, May 13, 2014 Page 12
3. Press the LASER ENABLE button. The LASER ON indicator will blink for about 5 seconds and then
become steady and illuminated as shown in Figure 10. If the blinking time of the LASER ON indicator is
longer than 10 seconds, please turn off the laser and call your local Thorlabs Technical Support for
assistance.
Figure 10 Swept laser enabled.
4.2.2. Turning Off the Laser
The following turn OFF procedure is required for proper shut down of the laser:
1. Press the LASER ENABLE button to disable the laser output. The LASER ON indicator will blink for about
2-3 seconds and then become steady OFF.
2. Turn the Power Switch to OFF to completely turn off the laser.
WARNING
Do not, under any circumstances, turn off a running laser by directly turning off the power switch.
The MEMS actuator inside the laser is sensitive to abrupt change of high voltage drive
signals and may cause permanent damage of device and significant repair cost
will be incurred due to this damage.
4.2.3. Daily operation
For daily operation of the laser, it is recommended that user follow above laser turn on/turn off procedures during
each usage of the laser. Do not leave the laser running unattended for longer than about half an hour. The
MEMS-VCSEL laser has a designed operating lifetime and unnecessary running of the laser may cause
shortening of meaningful product lifetime.

MEMS-VCSEL Swept Laser Chapter 4: General Operation
22797-D02, Rev B, May 13, 2014 Page 13
4.2.4. Adjusting the Polarization Controllers
Two polarization controllers are user accessible from the back panel of the laser.
Figure 11 Polarization control (PC) paddles on the back panel of the laser
PC 1A and PC 1B (PC OUT):
These are the two paddles of the polarization controller 1 on Figure 2. They control the output fiber polarization for
the BOA. The user should periodically adjust these paddles to maximize the laser output power (by monitoring the
LASER MONITOR signal on an oscilloscope) during the operation of the laser.
PC 2A and PC 2B (PC IN):
These are the two paddles of the polarization controller 2 on Figure 2. They control the input fiber polarization for
the BOA and also the polarization in laser output. These paddles do not need to be adjusted under normal
operation.

MEMS-VCSEL Swept Laser Chapter 5: Care and Maintenance
22797-D02, Rev B, May 13, 2014 Page 14
Chapter 5 Care and Maintenance
Handle the system with care during transportation and unpacking. Banging or dropping the Swept Laser can
damage the unit or lower system performance.
Attention
If the system is mishandled during shipment, the optical components may become misaligned,
which could lead to a decreased performance. If this happens, the system will need to be
realigned by qualified personnel.
If the system is dropped from a height greater than 15", it will be necessary for qualified Thorlabs’
personnel to perform an electrical security check.
Please contact Thorlabs for more information.
Below is a list of important operation information.
•Do not store or operate in a damp, closed environment.
•Do not store or operate on surfaces that are susceptible to vibrations.
•Do not expose to direct sunlight.
•Do not use solvents on or near the equipment.
•Keep away from dust, dirt, and air-borne pollutants (including cigarette smoke). The system is not
designed for outdoor use. Protect the equipment from rain, snow and humidity.
•Do not expose to mechanical and thermal extremes. Protect the equipment from rapid variation in
temperature.
•Handle all connectors, both electrical and optical, with care. Do not use unnecessary force as this may
damage the connectors.
•Handle the optical fiber with care; mechanical stress can decrease the performance and potentially
destroy the fiber. Continual bending of the optical fiber can cause damage, it is important to keep the
optical fiber patch cable as straight as possible to minimize bending.
Note, the most common cause of low signal intensity is contamination of the fiber due to dust and other pollutants.
To minimize exposure, avoid unnecessarily disconnecting the optical fiber patch cable. In addition, it is advisable
to check the fiber before making other adjustments to the optical system such as changing the focus, or optical
path length. Be sure to check the patch cord for a loose connection, and make sure that the fiber is kept as
straight as possible.
Warning
All lasers, especially laser having resonator cavities defined by mechanical tolerances, are
delicate precision instruments and they must be handled accordingly.
The swept laser is designed to withstand normal transportation and normal operation conditions.
Do not move the system while it is connected and in operation.
! !
! !

MEMS-VCSEL Swept Laser Chapter 5: Care and Maintenance
22797-D02, Rev B, May 13, 2014 Page 15
5.1. Maintenance: Optical Cleaning
Before connecting any fiber to the swept laser output, make sure the fiber is clean. A dirty fiber will lead to poor
output power, reducing the performance of the laser. Whenever using the swept source system, the following
rules of thumb for optical fiber connection should be followed.
•ALWAYS inspect and clean the fiber end before plugging it into a receptacle.
•ALWAYS cover the fiber end and any receptacles that are not in use with a fiber cap or dust protection
cover.
5.2. Service
Only trained and approved Thorlabs’ personnel should service the system. Please contact your local technical
support office.
5.3. Accessories and Customization
Though the system is easily adapted for custom interfaces, to achieve the listed specifications, this system should
only be used with accessories provided by Thorlabs. Any modification or servicing by unqualified personnel
renders the warranty null and void, leaving Thorlabs free of liability. Please contact Thorlabs for questions on
customization.
5.4 Setting and Replacing Fuses
The MEMS-VCSEL Swept Laser is shipped configured for 100 to 240 VAC operation. There is no
end-user adjustment of the line voltage. Simply select the correct AC line cord for their geographic location.
To change the power fuse, perform the following steps:
1. Remove the AC line cord if it is connected to the unit.
2. Locate the fuse tray directly below the AC line cord connection on the rear panel of the unit.
3. Carefully use a flat blade screwdriver to open the fuse tray.
4. Remove the existing fuse and install the appropriate fuse (500 mA). The replacement fuse must be a 5
mm x 20 mm, 250 VAC Type T Fuse (IEC 60127-2/III, low breaking capacity, slow blow).
5. Push the fuse tray back into place, making sure that it snaps and seats correctly.
6. Connect the appropriate line cord into the AC receptacle and plug the unit in.

MEMS-VCSEL Swept Laser Chapter 6: Specifications
22797-D02, Rev B, May 13, 2014 Page 16
Chapter 6 Specifications
Unless otherwise stated, all specs are typical.
Item # All Models
Min Typical Max Units
Central Wavelength 1285 1300 1315 nm
Tuning Range (-20 dB cut-off) > 100 nm
Coherence Length > 100 mm
Average Output Power120 25 50 mW
Duty Cycle (Unidirectional Sweep) > 65 %
Averaged Relative Intensity Noise2< 1.0 %
Ripple Noise < -46 dB
Storage/Operating Temperature 10 25 40 °C
Humidity > 85%, non-condensing environment -
Supply Voltage3100 – 240 VAC, 50/60 Hz -
Laser Classification (per IEC 60825-1) Class 1M -
Dimensions (L x W x H) 315 x 295 x 146 (12.4 x 11.6 x 5.75) mm (in)
Item # SL1310V1-10048
Min Typical Max Units
Scan Repetition Rate 99 100 101 kHz
Integrated MZI interferometer delay 46 48 50 mm
Supported OCT imaging depth range 11.5 12 12.5 mm
Item # SL1310V1-20024
Min Typical Max Units
Scan Repetition Rate 198 200 202 kHz
Integrated MZI interferometer delay 23 24 25 mm
Supported OCT imaging depth range 5.5 6 6.5 mm
Item # SL1310V1-20048
Min Typical Max Units
Scan Repetition Rate 198 200 202 kHz
Integrated MZI interferometer delay 46 48 50 mm
Supported OCT imaging depth range 11.5 12 12.5 mm
1Measured at laser output aperture
2Measured using a detector with DC to 400 MHz bandwidth, and averaged over all output wavelengths.
3Swept source has universal AC input.

MEMS-VCSEL Swept Laser Chapter 7: Troubleshooting
22797-D02, Rev B, May 13, 2014 Page 17
Chapter 7 Troubleshooting
Note, the most common cause of low signal intensity is contamination of the fiber due to dust and other pollutants.
To minimize exposure avoid unnecessarily disconnecting the optical fiber patch cable. In addition, it is advisable
to check the fiber before making other adjustments to the optical system such as changing the focus, or optical
path length. Be sure to check the patch cord for a loose connection, and make sure that the fiber is kept as
straight as possible.
Symptom Possible Cause Solution
System does not start No power is supplied to the unit Connect the power supply
Power cord is broken Change power cord
Other reason Call Thorlabs for assistance
Poor performance or no signal Fiber not connected Connect fiber patch cable
Fiber tip is dirty Clean fiber tip
Other reason Call Thorlabs for assistance
Laser turns off and temp indicator
turns on
Exhaust fan is broken. Stop system and call for service

MEMS-VCSEL Swept Laser Chapter 8: Certificate of Compliance
22797-D02, Rev B, May 13, 2014 Page 18
Chapter 8 Certificate of Compliance
Pending certification.

MEMS-VCSEL Swept Laser Chapter 9: Regulatory
22797-D02, Rev B, May 13, 2014 Page 19
Chapter 9 Regulatory
As required by the WEEE (Waste Electrical and Electronic Equipment Directive) of the European Community and
the corresponding national laws, Thorlabs offers all end users in the EC the possibility to return “end of life” units
without incurring disposal charges.
•This offer is valid for Thorlabs electrical and electronic equipment:
•Sold after August 13, 2005
•Marked correspondingly with the crossed out “wheelie bin” logo (see right)
•Sold to a company or institute within the EC
•Currently owned by a company or institute within the EC
•Still complete, not disassembled and not contaminated
As the WEEE directive applies to self-contained operational electrical and electronic products, this end of life take
back service does not refer to other Thorlabs products, such as:
•Pure OEM products, that means assemblies to be built into a unit by the user (e. g. OEM laser driver
cards)
•Components
•Mechanics and optics
•Left over parts of units disassembled by the user (PCB’s, housings etc.).
If you wish to return a Thorlabs unit for waste recovery, please contact Thorlabs or your nearest dealer for further
information.
9.1. Waste Treatment is Your Own Responsibility
If you do not return an “end of life” unit to Thorlabs, you must hand it to a company specialized in waste recovery.
Do not dispose of the unit in a litter bin or at a public waste disposal site.
9.2. Ecological Background
It is well known that WEEE pollutes the environment by releasing toxic products during decomposition. The aim of
the European RoHS directive is to reduce the content of toxic substances in electronic products in the future.
The intent of the WEEE directive is to enforce the recycling of WEEE. A controlled recycling of end of life products
will thereby avoid negative impacts on the environment.
Wheelie Bin Logo