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12 January 2012Measurement of losses in optical components using filtered optical feedback cavity ring down technique
A filtered optical feedback cavity ring down (FOF-CRD) technique employing a continuous wave Fabry-Perot diode
laser is employed to measure the total optical losses, i.e., absorption and scattering in optical components with arbitrary
thickness. The FOF from the ring down cavity (RDC) is re-injected into the oscillator cavity of the diode laser, and the
coupling efficiency of the laser into the RDC is significantly enhanced due to the FOF effect. An optical component
having parallel optical surfaces is inserted exactly normal to the light beam in the RDC. The optical losses of the
component are obtained from the change in the ring-down time of the RDC containing the component with respect to
that of the empty RDC. The measurement results for different samples are in good agreement with conventional laser
calorimetry data. The experimental results have demonstrated that the FOF-CRD technique is simple, inexpensive and
fast for measuring optical losses of optical components used in high-power laser system.
Zhechao Qu,Bincheng Li, andYanling Han
"Measurement of losses in optical components using filtered optical feedback cavity ring down technique", Proc. SPIE 8206, Pacific Rim Laser Damage 2011: Optical Materials for High Power Lasers, 82061M (12 January 2012); https://doi.org/10.1117/12.910454
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Zhechao Qu, Bincheng Li, Yanling Han, "Measurement of losses in optical components using filtered optical feedback cavity ring down technique," Proc. SPIE 8206, Pacific Rim Laser Damage 2011: Optical Materials for High Power Lasers, 82061M (12 January 2012); https://doi.org/10.1117/12.910454