Optical component high reflectivity measurement system and measurement method

Abstract

A system and method for measuring high reflectivity of optical components, the system includes a laser light source, a photodetector, an oscilloscope, a signal generator, a first optical fiber, an optical fiber isolator, a second optical fiber, a third optical fiber, a first optical fiber coupler, The fourth optical fiber, the sample stage, the first attitude adjustment mechanism, the second attitude adjustment mechanism, the fifth optical fiber, the second optical fiber coupler and the sixth optical fiber, and the existing commonly used resonant cavity based on high reflection mirrors have high reflectivity Compared with the measurement technology, the measurement sensitivity of the present invention is increased by more than 1000 times, and the measurement system has the characteristics of compact structure, flexible layout, strong anti-interference ability and convenient measurement.

Description

technical field [0001] The invention relates to the field of high reflectivity measurement, in particular to a high reflectivity measurement system and method for an optical element. Background technique [0002] Mirrors with extremely high reflectivity (higher than 99.9%) are widely used in the fields of gravitational wave observation, laser gyroscope, high-power laser, etc. In these systems, the reflectivity of the reflective element directly determines the optical system A series of important parameters, so the accurate measurement of high reflectivity is of great significance [see literature [1] A.Abramovici, W.E.Althouse, R.W.P.Drever, Y.Gursel, S.Kawamura, F.J.Raab, et al., "Ligo -the Laser-Interferometer-Gravitational-Wave-Observatory, "Science, vol.256, pp.325-333, 1992. [2] W.W.Chow, J.Geabanacloche, L.M.Pedrotti, V.E.Sanders, W.Schleich, and M.O.Scully , "The Ring Laser Gyro," Reviews of Modern Physics, vol.57, pp.61-104, 1985.]. [0003] At present, the optical ...

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Problems solved by technology

[0012] Formula (4) is the calculation formula of the smallest detectable unit of the system [see literature: 7C.J.Wang,"Fiber LoopRingdown-a Time-Domain Sensing Technique for Multi-Function Fiber OpticSensor Platforms:Current Status and Design Perspectives,"Sensors, vol.9, pp.7595-7621, 2009.], where m, is a fixed value, it can be seen that the smallest detectable unit of the system is inversely proportional to the cavity length L. Considering that the resonant cavity of the current common measurement method is composed of cavity mirrors, the cavity length of the resonant cavity is generally about 1 meter, so The minimum detectable unit is large, and the detection sensitivity of the system is low

[0013] (2) Since the resonant cavity is composed of cavity mirrors, and the cavity mirrors need to be precisely adjusted before they can work normally, the measurement process is cumbersome, and the anti-interference ability of the system is poor

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