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Proceedings Paper

Instantaneous measurement of M2 beam propagation ratio in real-time
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Paper Abstract

A new instrument design allows the M2 beam propagation ratio to be measured in real time at the update rate of a standard CCD camera. This allows lasers from single shot to CW to be measured while the laser cavities are being adjusted. This drastically reduces the test time required for this operation. In this paper we will discuss the theory behind this innovative approach to the M2 measurement and the methods for the selection of the proper optical components for use of the system with various laser types and beam shapes. The authors will show results of numerous measurements of different lasers and laser types, including solid state diode and traditional gas lasers with M2 values from near 1 to considerably higher values, and show comparisons these results with other measurement methods. The instrument design is based on a method of simultaneous capture of the waist and several Rayleigh ranges, allowing the instantaneous fit of the ISO M2 propagation curve. The authors will discuss the important considerations necessary to generate accurate results for different laser configurations.

Paper Details

Date Published: 5 March 2008
PDF: 11 pages
Proc. SPIE 6871, Solid State Lasers XVII: Technology and Devices, 687103 (5 March 2008); doi: 10.1117/12.763661
Show Author Affiliations
Allen M. Cary, Photon Inc. (United States)
Jeffrey L. Guttman, Photon Inc. (United States)
Razvan Chirita, Photon Inc. (United States)
Derrick W. Peterman, Photon Inc. (United States)

Published in SPIE Proceedings Vol. 6871:
Solid State Lasers XVII: Technology and Devices
W. Andrew Clarkson; Norman Hodgson; Ramesh K. Shori, Editor(s)

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