LD End Pumped High Power Single-Frequency And Frequency-Stabilized Nd: YVO₄ Laser

Laser diode end pumped solid-state laser has many advantages, including high efficiency, high frequency stability, narrow fine width, long lifetime, compact configuration, convenient for use et al, which made her a necessity in many high level quantum optics experiments.In mis thesis, we report a laser with maximum output of 4.16W, intensity fluctuation less than 0.5%(RMS) in an hour, and frequency noise less than 340KHz. The emphasis was put on the analysis of the design and configuration of the all solid-state single frequency Nd: YVO4 laser. How to realize stable efficient single-frequency operation under high pump power was analyzed both experimentally and theoretically. Our studies provide theoretic and experimental basis for improving laser power, optimizing configuration parameters for the next work. And the side-band frequency stabilization technique was systematically discussed.This thesis consists of four parts:Chapter one: Introduction. In this part, the development and prospect of laser diode end pumped solid-stats laser is briefly introducedChapter two: Design and optimization of the laser cavity. First, some principle that should be considered in building a laser cavity was discussed based on the rate equation of four-level laser model. Then, the thermal lens effect of Nd: YVO4 crystal was analyzed and estimated theoretically. The laser cavity was designed by considering the thermal lens effect and the optimal transmission was estimated. Under single frequency operation, the maximum output power of 4.16W is obtained at 1064nm with the LD pumping power of 16W. The optical-optical conversion efficiency is more than 30.5%. The slope efficiency is more than 40.2%. The intensity fluctuation is less than 0.5%(RMS) in an hour. Over 375MHz continuous frequency tuning was obtained when the cavity length was scanned by PZT.Chapter three: Sideband frequency stabilization. This chapter consists of five parts. In 3.1 the reflection characteristic of F-P cavity is presented. In 3.2 the optical-electronic modulation is introduced and the technique of how to make a resonant EOM is discussed also. In 3.3 the theory of frequency stabilization was presented systematically In 3.4 the PID technique in feed back loop is simply introduced Experiment arrangement, and experiment results of less than 340KHz frequency noise is presented in 3.5.Chapter four: Conclusion and prospects.