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Technical Documentation
Alignment Procedure for Littman/Metcalf (TEC-500)
1
Security Precautions ................................................................................................................ 2
1.1
Radiation Protection ............................................................................................................ 2
1.2
ESD Protection .................................................................................................................... 2
1.3
Protection of Optical Elements ............................................................................................ 2
1.4
Identification of Each Element within the Laser Head........................................................ 3
2
Collimation of the Laser Diode ............................................................................................... 5
2.1
Laser Diode Beam Propagation ........................................................................................... 5
2.2
Determining the Status of the Laser Collimation ................................................................ 6
2.3
Adjustment of the Laser Collimation .................................................................................. 7
3
Cavity Alignment ....................................................................................................................... 8
3.1
Pre-Adjustment of the Reflection Prism .............................................................................. 8
3.2
Minimizing the Laser Threshold ....................................................................................... 10
4
Mode-Hop Free Tuning .......................................................................................................... 12
4.1
Principles of Mode-Hop Free Tuning................................................................................ 12
4.2
Monitoring the Tuning Performance via Fabry Perot Interferometer ............................... 12
4.3
Monitoring the Tuning Performance via Power Monitoring ............................................. 12
4.4
Monitoring the Tuning Performance via Wavemeter ........................................................ 14
4.5
Optimizing the Tuning Performance ................................................................................. 14
5
Summary .................................................................................................................................. 16
Thank you for ordering a laser system with Sacher Lasertechnik. The provided alignment
procedure will enable you to achieve the best performance with the laser system.
Sacher Lasertechnik GmbH
Tel.:
Rudolf Breitscheid Str. 1-5
Fax:
D-35037 Marburg, Germany
Email:
Laser Cavities
+49 6421 305-0
Sacher
Lasertechnik, LLC
+49 6421 305-299
5765
Equador
contact@sacher.de
Buena Park, CA 90620, USA
Tel.:
1-714-670-7605
Way
Fax:
1-714-670-7662
Email: sales@sacher-laser.com
Page 1
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Table of Contents
Summary of Contents for Sacher Lasertechnik TEC-500
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Page 1: Table Of Contents
Monitoring the Tuning Performance via Wavemeter ............14 Optimizing the Tuning Performance ................. 14 Summary ..........................16 Thank you for ordering a laser system with Sacher Lasertechnik. The provided alignment procedure will enable you to achieve the best performance with the laser system. Page 1 Sacher Lasertechnik GmbH Tel.:... -
Page 2: Security Precautions
The optical elements within the laser head are sensitive components. A simple finger print will cause a irreversible damage. Do not touch an optical surface of any of the optical components. Page 2 Sacher Lasertechnik GmbH Tel.: +49 6421 305-0 Sacher Lasertechnik, LLC Tel.:... -
Page 3: Identification Of Each Element Within The Laser Head
Fig. 1: CAD drawing of the Littman/Metcalf laser head. The red arrow indicates laser radiation (A). Laser beam (A) is the zero order diffraction of the diffraction grating. Green arrows indicate fine adjustments screw. Black arrows indicate optical elements. Page 3 Sacher Lasertechnik GmbH Tel.: +49 6421 305-0 Sacher Lasertechnik, LLC Tel.:... - Page 4 Fig. 3 shows a photo our Littman/Metcalf type of laser head. The green arrows indicate fine adjustment screws. Contact us in case you feel uncertain on any of the described elements. Page 4 Sacher Lasertechnik GmbH Tel.: +49 6421 305-0 Sacher Lasertechnik, LLC Tel.:...
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Page 5: Collimation Of The Laser Diode
The laser radiation is indicated on the right hand side of the laser diode. The schematic indicates the beam profile of the astigmatic beam propagation. Page 5 Sacher Lasertechnik GmbH Tel.: +49 6421 305-0 Sacher Lasertechnik, LLC Tel.:... -
Page 6: Determining The Status Of The Laser Collimation
Make sure to wear eye protective glasses and a ESD protective wrist band before starting any work at the collimator. Page 6 Sacher Lasertechnik GmbH Tel.: +49 6421 305-0 Sacher Lasertechnik, LLC Tel.:... -
Page 7: Adjustment Of The Laser Collimation
1.5m distance from the collimator. The beam propagation be adjusted via rotation of the adjustment tool shown in Fig. 6. Do not rotate the adjustment screw more than +/- ¼ of a rotation. Page 7 Sacher Lasertechnik GmbH Tel.: +49 6421 305-0 Sacher Lasertechnik, LLC Tel.:... -
Page 8: Cavity Alignment
Fig. 7: Schematic view of the laser spot visible on a screen placed into the zeroth order beam of the laser head. The steps 1 to 4 describe the steps of the alignment procedure. Page 8 Sacher Lasertechnik GmbH Tel.: +49 6421 305-0 Sacher Lasertechnik, LLC Tel.:... - Page 9 Fig. 7 (4). Laser Power Cavity Alignment Fig. 8: Schematic of the dependence of the laser power as a function of the cavity alignment. Page 9 Sacher Lasertechnik GmbH Tel.: +49 6421 305-0 Sacher Lasertechnik, LLC Tel.: 1-714-670-7605 Rudolf Breitscheid Str.
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Page 10: Minimizing The Laser Threshold
B) Alternatively, you may use the internal Ramp Generator function of the laser controller together with the Current Coupling function of our laser controller for generating the laser current modulation. Page 10 Sacher Lasertechnik GmbH Tel.: +49 6421 305-0 Sacher Lasertechnik, LLC Tel.:... - Page 11 No more than 1/8 of a turn of the collimator adjustment screw will be required. Repeat step G) and H) until the maximum power is achieved. Page 11 Sacher Lasertechnik GmbH Tel.: +49 6421 305-0 Sacher Lasertechnik, LLC Tel.:...
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Page 12: Mode-Hop Free Tuning
Required items are an oscilloscope, a power meter with a monitor exit and a piezo amplifier with signal generator. A) Connect the monitor output of the power with Channel A of the oscilloscope. Page 12 Sacher Lasertechnik GmbH Tel.: +49 6421 305-0 Sacher Lasertechnik, LLC Tel.:... - Page 13 A discontinuous power change indicates a mode-hop. This method is fast and effective way of monitoring mode-hop free tuning performance during piezo scanning. Page 13 Sacher Lasertechnik GmbH Tel.: +49 6421 305-0 Sacher Lasertechnik, LLC Tel.:...
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Page 14: Monitoring The Tuning Performance Via Wavemeter
E) In case the laser shows mode-hops where the laser frequency jumps against direction of tuning, the cavity length needs to be enlarged. Page 14 Sacher Lasertechnik GmbH Tel.: +49 6421 305-0 Sacher Lasertechnik, LLC Tel.:... - Page 15 Collimator base plate screw TEC-500 side view Fig. 10: Photo of the laser cavity indicating Collimator base plate and Collimator base plate screw for changing the cavity length F) The cavity length may be adjusted via changing the position of the collimator base plate where the collimator is mounted to.
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Page 16: Summary
When contacting us please provide a technical documentation of the results obtained during the steps of the alignment procedure. This will allow us to give you an analysis of possible issues. Page 16 Sacher Lasertechnik GmbH Tel.: +49 6421 305-0 Sacher Lasertechnik, LLC Tel.:...
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