MOGlabs MSA User manual

Amplified laser system
Model MSA – internal seed
Model MOA/MOA(L)/MOA(C) – external seed
Revision 2.00

Limitation of Liability
MOG Laboratories Pty Ltd (MOGLabs) does not assume any liability aris-
ing out of the use of the information contained within this manual. This
document may contain or reference information and products protected by
copyrights or patents and does not convey any license under the patent
rights of MOGLabs, nor the rights of others. MOGLabs will not be liable
for any defect in hardware or software or loss or inadequacy of data of
any kind, or for any direct, indirect, incidental, or consequential damages
in connections with or arising out of the performance or use of any of its
products. The foregoing limitation of liability shall be equally applicable
to any service provided by MOGLabs.
Copyright
Copyright ©MOG Laboratories Pty Ltd (MOGLabs) 2017 – 2021. No
part of this publication may be reproduced, stored in a retrieval system,
or transmitted, in any form or by any means, electronic, mechanical, pho-
tocopying or otherwise, without the prior written permission of MOGLabs.
Contact
For further information, please contact:
MOG Laboratories P/L
49 University St
Carlton VIC 3053
AUSTRALIA
[phone]
[email protected]
MOGLabs USA LLC
419 14th St
Huntingdon PA 16652
USA
[phone]
www.moglabs.com

Preface
The MOGLabs optical amplifier laser system provides up to 6 W of tun-
able highly coherent optical radiation for atomic cooling, Bose-Einstein
condensation, ion trapping, and other spectroscopic applications. It re-
produces the optical spectrum of the input seed laser, maintaining the
linewidth while increasing the output power by up to 400 times (+26 dB).
It can be configured as amplifier only (MOA) or with seed laser (MSA). Con-
figurations may include input and/or output fibre coupling, and input and
output Faraday isolators. The MOGLabs DLC and LDD drivers are ideally
suited for operating the seed and amplifier components of the amplifier
system.
We hope that the MOGLabs optical amplifier system can work well for your
application. We are proud of our products and continuously improving
them. Please let us know if you have any suggestions for enhancement of
the product or this document, so that we can make life in the lab better
for all.
MOGLabs, Melbourne, Australia
www.moglabs.com
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Safety Precautions
Your safety and the safety of your colleagues depends on careful atten-
tion to proper operation of this product. Please read the following safety
information before attempting to operate. Please note several specific
and unusual cautionary notes before using the MOGLabs MSA and MOA,
in addition to the safety precautions that are standard for any electronic
equipment. The directions here apply to both MSA and MOA (amplifier-
only) configurations except where explicitly stated otherwise.
WARNING
Do not operate the amplifier above the Maximum current, unseeded
without appropriate input seed. Operation exceeding that condition
can cause fatal structural degradation of the TA diode. Refer to the
Maximum current, unseeded specified in the amplifier test report.
CAUTION
USE OF CONTROLS OR ADJUSTMENTS OR
PERFORMANCE OF PROCEDURES OTHER THAN THOSE
SPECIFIED HEREIN
MAY RESULT IN HAZARDOUS RADIATION EXPOSURE
Laser output from the MSA and MOA can be dangerous. Please ensure that
you implement the appropriate hazard minimisations for your environment,
such as laser safety goggles, beam blocks, and door interlocks. MOGLabs
takes no responsibility for safe configuration and use of the laser. Please:
•Avoid direct exposure to the output beams, both from the injection
seed input aperture and the amplified output aperture.
•Avoid looking directly into either beam.
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•Note the safety labels (examples shown in figure 1) and heed their
warnings.
•The MSA or MOA must be operated with a controller with keyswitch
interlock. The MSA must not be powered unless the keyswitch is
inserted and switched on. It should not be possible to remove the
keyswitch without turning off the power to the MSA or MOA.
•When the seed laser and amplifier are switched on, there should
be a delay of two seconds before the emission of laser radiation,
mandated by European laser safety regulations (IEC 60825-1).
WARNING Do not operate the amplifier without sufficient seed laser input. It is
important that an injection seed laser beam is coupled into the ta-
pered amplifier (TA) diode so that most of the electrical input energy
is converted to optical output rather than lost as heat, which would
damage the TA diode.
NOTE The MOGLabs MSA and MOA are designed for use in scientific re-
search laboratories. They should not be used for consumer or medical
applications.
Protection Features
The MOGLabs MSA and MOA include a number of features to protect you
and the device. They should be used with a power supply that provides
additional safety features such as key lock operation, current limit, tem-
perature limit, cable continuity and short-circuit detection, soft-start and
turn-on delay.
Protection relay When the power is off, or the temperature controller is
off, the amplifier diode is shorted via a normally-closed relay.
LEDsSeparate LED indicators illuminate when the seed laser and amplifier
diode current supplies are enabled.

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Label identification
The International Electrotechnical Commission laser safety standard IEC
60825-1:2007 mandates warning labels that provide information on the
wavelength and power of emitted laser radiation, and which show the
aperture where laser radiation is emitted. Figures 1 and 2 show examples
of these labels and their location on the MSA and MOA.
Model number: MSA003
Serial number: A41706001
Manufactured: JUNE 2017
Complies with 21 CFR 1040.10, and 1040.11 except for
deviations pursuant to Laser Notice No.50, dated 24 June 2007
MOG Laboratories Pty Ltd, 49 University St
Carlton VIC 3053, AUSTRALIA
AVOID EXPOSURE
VISIBLE AND INVISIBLE
LASER RADIATION IS
EMITTED FROM THIS APERTURE
Aperture label engraving
US FDA compliance
Warning and advisory label
Class 4
IEC 60825-1:2007
AS/NZS 2211.5:2006
VISIBLE LASER RADIATION
AVOID EYE OR SKIN EXPOSURE TO
DIRECT OR SCATTERED RADIATION
CLASS 4 LASER PRODUCT
Wavelength Max Power
665 − 675nm 600mW
Figure 1: Warning advisory and US FDA compliance labels.

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IEC 60825-1:2007
AS/NZS 2211.5:2006
VISIBLE LASER RADIATION
AVOIDEYE OR SKIN EXPOSURE TO
DIRECT OR SCATTEREDRADIATION
CLASS 4 LASER PRODUCT
Wavelength Max Power
665 − 675nm 600mW
IEC 60825-1:2007
AS/NZS 2211.5:2006
VISIBLE LASER RADIATION
AVOIDEYE OR SKIN EXPOSURE TO
DIRECT OR SCATTEREDRADIATION
CLASS 4 LASER PRODUCT
Wavelength Max Power
665 − 675nm 600mW
Emission indicators
Model number:
MSA003
Serial number:
A41706002
Manufactured:
JUNE 2017
Complies with 21 CFR 1040.10, and 1040.11 except for
deviations pursuant to Laser Notice No.50, dated24 June 2007
MOG Laboratories Pty Ltd, 49 University St
Carlton VIC 3053, AUSTRALIA
Model number: MSA003
Serial number: A41706002
Manufactured: JUNE 2017
Complies with 21 CFR 1040.10, and 1040.11 except for
deviations pursuant to Laser Notice No.50, dated 24 June 2007
MOG Laboratories Pty Ltd, 49 University St
Carlton VIC 3053, AUSTRALIA
FDA compliance
and serial number
Laser warning advisor
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Figure 2: Schematic showing location of warning labels compliant with Inter-
national Electrotechnical Commission standard IEC 60825-1:2007, and US FDA
compliance label. Emission indicator for seed laser (left) and amplifier (right).
Aperture label engraved on front and rear apertures; warning advisory label on
right hand side, compliance label left hand side near exit aperture.

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Contents
Preface i
Safety Precautions iii
1 Introduction 1
2 Safety features 5
2.1 Interlock .............................. 5
2.2 Photodiode safety cutout . . . . . . . . . . . . . . . . . . . . 5
3 First light 7
4 MSA: internal seed alignment 9
4.1 Small adjustment to seed alignment . . . . . . . . . . . . . . 9
4.2 Substantial adjustment to seed alignment . . . . . . . . . . 10
5 MOA: external seed alignment 19
5.1 Seedalignment.......................... 19
5.2 Reverse propagating TA diode beam collimation . . . . . . . 24
6 Output beam optimisation 27
6.1 Procedure for output beam optimisation . . . . . . . . . . . . 28
7 Fibre coupling 31
7.1 Fibre alignment touch-up . . . . . . . . . . . . . . . . . . . . 33
7.2 Fibre alignment procedure . . . . . . . . . . . . . . . . . . . 35
7.3 Fibre coupler collimation . . . . . . . . . . . . . . . . . . . . 38
7.4 Troubleshooting.......................... 39
8 Diode replacement 41
A Electrical connections 45
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viii Contents
A.1 Amplifier headboard: MOA,MSA ................ 45
A.2 Connectorpinouts ........................ 48
B Chassis dimensions 51