In 2012 the authors developed a passive optical design that provided real-time M-square measurement of a laser or laser system but nevertheless still required calibration of the key optics within the system: a Fabry-Perot etalon pair and their spacing in order to obtain an accurate M-square result. Using existing data from the sensor along with a simple ray tracing technique, the etalon spacing can be determined with high accuracy through the deconvolution of the data from the sensor; thereby eliminating a separate time consuming calibration. The key calibration information can now be obtained in a fraction of a second without any effort on the part of the user.
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Michael Scaggs, Gil Haas, "Self-calibrating, real-time M-square measurement system," Proc. SPIE 10090, Laser Resonators, Microresonators, and Beam Control XIX, 100901Q (20 February 2017);