Accurate high reflectivity measurement based on a novel optical feedback cavity ring-down technique

Yuan Gong; Bincheng Li; Yanling Han; Mingqiang Liu

doi:10.1117/12.804178

30 December 2008 Accurate high reflectivity measurement based on a novel optical feedback cavity ring-down technique

Yuan Gong, Bincheng Li, Yanling Han, Mingqiang Liu

Author Affiliations +

Proceedings Volume 7132, Laser-Induced Damage in Optical Materials: 2008; 71320U (2008) https://doi.org/10.1117/12.804178
Event: Boulder Damage Symposium XL Annual Symposium on Optical Materials for High Power Lasers, 2008, Boulder, Colorado, United States

Abstract

Highly reflective mirrors have been widely used in high power lasers, laser gyros, and gravitational-wave detection, etc. However, reliable measurement of high reflectivity (R>99.99%) is difficult. In this paper a novel optical feedback cavity ring-down technique (OF-CRD) by re-injecting the strong optical feedback from the ring-down cavity (RDC) into the oscillator cavity of a Fabry-Perot diode laser is developed for the ultra-high reflectivity measurement. The laser line is narrowed and occasionally in resonance with one or more ring-down cavity modes. The amplitude of the RDC output signal is enhanced by a factor of over two orders of magnitude, compared with the conventional phase-shift CRD technique. Four pairs of cavity mirrors with different reflectivity are used to investigate the sensitivity and reproducibility of the OF-CRD technique. The accuracy is greatly enhanced from about 0.003% to 0.00003% as the reflectivity of cavity mirrors increases from about 99.8% to 99.996%. A folded RDC with cavity length of 70cm is constructed by inserting a planar test mirror into the linear RDC and the reflectivity of the test mirror is statistically determined to be 99.9526±0.0004%. The OF-CRD is simple, reliable, highly-sensitive and cost efficient.

Citation Download Citation

Yuan Gong, Bincheng Li, Yanling Han, and Mingqiang Liu "Accurate high reflectivity measurement based on a novel optical feedback cavity ring-down technique", Proc. SPIE 7132, Laser-Induced Damage in Optical Materials: 2008, 71320U (30 December 2008); https://doi.org/10.1117/12.804178

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