© 2011 Thorlabs
.................................................................................................................................................. 78Hardw are Trigger
................................................................................................................................... 815 Beam Quality (M²) Measurement
......................................................................................................................................................... 81General
......................................................................................................................................................... 85M² Application recommendations
......................................................................................................................................................... 87Selecting Focal and Stage Length
......................................................................................................................................................... 89Extension Hardw are
.................................................................................................................................................. 89BC1M2 Extension Set for M² measurement
.................................................................................................................................................. 90Recommended Accessories
......................................................................................................................................................... 93Setting up
.................................................................................................................................................. 93Mechanical Setup
.................................................................................................................................................. 95Electrical Connections
........................................................................................................................................... 95Installation of USB to RS232 Converter
......................................................................................................................................................... 98M² Measurement
.................................................................................................................................................. 98Initialize
.................................................................................................................................................. 100Beam Alignment
.................................................................................................................................................. 104M² Panel
.................................................................................................................................................. 107M² Settings
.................................................................................................................................................. 111Running The Measurement
.................................................................................................................................................. 112Numerical Results
.................................................................................................................................................. 117Troubleshooting
......................................................................................................................................................... 119Divergence Measurement
.................................................................................................................................................. 119Divergence Measurement Panel
.................................................................................................................................................. 121Divergence Measurement Settings
.................................................................................................................................................. 123Running The Measurement
.................................................................................................................................................. 123Numerical Results
Part IV Computer Interface
126
................................................................................................................................... 1261 Libraries
................................................................................................................................... 1282 Sample Programs
................................................................................................................................... 1313 Thorlabs Beam Library
Part V Maintenance and Repair
132
................................................................................................................................... 1321 Version and other Information
................................................................................................................................... 1322 Warnings and Errors
................................................................................................................................... 1333 Cleaning
................................................................................................................................... 1354 Troubleshooting
Part VI Application Note
137
................................................................................................................................... 1371 Ambient Light Correction
................................................................................................................................... 1372 Coordinate systems
................................................................................................................................... 1383 Raw Data Measurements
................................................................................................................................... 1404 Ellipse (fitted)
................................................................................................................................... 1405 X-Y-Profile Measurement
................................................................................................................................... 1416 Gaussian Fit Measurement
................................................................................................................................... 1427 M² Theory
......................................................................................................................................................... 145Focal and stage length calculation
Part VII Appendix
146
................................................................................................................................... 1461 Certifications and Compliances
................................................................................................................................... 1472 Warranty
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