High-power stable continuous-wave single-frequency Nd:YVO4 lasers
演讲课题：High-power stable continuous-wave single-frequency Nd:YVO4 lasers
Solid state continuous wave (cw) single-frequency lasers have attracted great interest due to their excellent properties of high output power, low noise and good beam quality. This kind of laseris widely used in a variety of application fields, such as cold atom physics, precise measurements, quantum optics, and so on. To suppress the mode hopping or multi-longitudinal-mode operation at a high pump power and obtain high power stable single-frequency lasers,a universal model about the sufficient condition of stable single-frequency operation is established and applied to the theoretical analysis of a high power unidirectional ring Nd:YVO4 laser at 1342 nm with energy transfer up conversion and excited stimulated absorption taken into account. After the influences of the LBO temperature and output transmission on the output characteristics and the single-frequency operation region of the laser were experimentally studied at a pump power of 50 W, a stable continuous-wave single-frequency laser with 1342 nm power of 11.3 W and 671 nm power of 0.3 W is fabricated by optimizing the transmission of output coupler and the temperature of LiB3O5 crystal. Mode-hopping-free laser operation with a power stability better than ±0.5% and a frequency fluctuation less than ±88 MHz is achieved during a given three hours. Consequently, the theoretical model can be employed as a useful tool for the design of the high power single-frequency lasers.