Optical Chopper System
18488-D02 Rev G, September 24, 2012 Page 2 www.thorlabs.com
Table of Contents
ePart 1. Safety Warnings ...........................................................................................................................5
Part 2. Product Overview .........................................................................................................................6
Front Panel Description ............................................................................................................................................. 7
Rear Panel Description .............................................................................................................................................. 7
Part 3. Setup .............................................................................................................................................8
Part 4. Basic Operation ............................................................................................................................9
4.1. Internal Reference Operating Mode ...................................................................................................... 9
4.2. External Reference Mode ........................................................................................................................ 9
4.3. Reference-Out Signal ............................................................................................................................. 10
Part 5. Advanced Operating Instructions ..............................................................................................11
5.1. Internal Frequency Synthesizer ............................................................................................................ 11
Setup for Internal Reference Frequency .................................................................................................................. 11
Selecting the REFERENCE OUT signal ................................................................................................................. 11
5.2. External Reference Mode ...................................................................................................................... 11
Setup for External Reference Frequency ................................................................................................................. 11
Selecting the REFERENCE OUT signal ................................................................................................................. 11
5.3. Harmonic Reference Generation .......................................................................................................... 12
Setup for External Reference Frequency ................................................................................................................. 12
Setting the Reference Harmonic .............................................................................................................................. 12
Setting the Sub-Harmonic ........................................................................................................................................ 12
Combining the Harmonic and Sub-Harmonic Modes .............................................................................................. 12
Selecting the REFERENCE OUT signal ................................................................................................................. 12
5.4. Two-Frequency Chopping ..................................................................................................................... 12
Selecting the REFERENCE OUT signal ................................................................................................................. 12
Setting the Chopping Speed in the Two Frequency Mode ....................................................................................... 13
5.5. Two-Slot Blade ....................................................................................................................................... 13
Setup for Two-Slot Blade Reference Frequency ...................................................................................................... 13
Selecting the REFERENCE OUT signal ................................................................................................................. 14
Part 6. Remote Communications ...........................................................................................................15
6.1. Installing the USB Drivers ..................................................................................................................... 15
6.2. Command Line Interface ...................................................................................................................... 15
6.3. Commands .............................................................................................................................................. 16
6.4. Blade Indexes .......................................................................................................................................... 18
Part 7. Maintenance and Troubleshooting ...........................................................................................19
7.1. Cleaning .................................................................................................................................................. 19
7.2. Diagnostic Messages ............................................................................................................................... 19
Part 8. Fuse Replacement and Line Voltage Selection ........................................................................20
8.1. Materials Needed .................................................................................................................................... 20
8.2. Fuse Replacement and Line Voltage Selection .................................................................................... 20
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