Research On The Technology To Measure The Cavity Optical Loss By Resonance Method

As the ideal sensitive element of the Strap-down Inertial Navigation System. Laser gyro has the following advantages:high sensitivity, high precision, large dynamic range, which has the great research value and wide usage in military and civil fields. As the core of the laser gyro, the precision and performance of laser gyro are directly affected by the size of the loss of optical resonator. so, a high request was proposed for the research and testing of the loss of optical resonator. After the original device for testing loss being fully researched and analysed, the test device was modified and optimized systematicly and tested, analysed by experiment.A comprehensive research was processed for the measuring method of the loss of optical resonator in this paper, the factors influencing the loss of optical resonator were analysed and the evaluation methods for the loss were discussed; the principle of measuring the loss of optical resonator by resonance method was expounded detailedly and the measurement formula of resonance method was derived strictly; the pattern matching of laser cavity was analyzed carefully; the controlling principle for the cavity length of the swept laser was studied; the multi-pattern algorithm and program design of full range linearization for piezoelectric ceramic based on the hardware timing were achieved, making piezoelectric ceramic achieve linearization in the time domain, the adjustable reference voltage for piezoelectric ceramic based on the software timing was added; the curve fitting algorithm for laser pattern was achieved and the test program was written by using LabVIEW software to realize the above functions; the influence of the test on resonator loss caused by the parameter matching between the photoelectric detector and the preamplifier was analysed; a systematic optimization design was implemented for the original measuring equipment. The accuracy, repeatability, stability of the working state of the test system was raised substantially by repeated debug for the system.