Abstract
A universal model about the sufficient condition of stable single-longitudinal-mode (SLM) operation is established and applied to the theoretical analysis of a high power unidirectional ring Nd:YVO4 laser at 1342 nm with energy transfer upconversion and excited stimulated absorption taken into account. A stable continuous-wave SLM 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.
Highlights
Solid state continuous wave single-longitudinal-mode (SLM) lasers have attracted great interest due to their excellent properties of high output power, low noise and good beam quality
The sufficient conditions of stable SLM operation for cw all-solid-state lasers are investigated theoretically, especially for high power 1342 nm lasers with energy transfer upconversion (ETU) and excited stimulated absorption (ESA) taken into account
We have presented a universal model about the sufficient condition of stable SLM operation for a high power unidirectional ring laser
Summary
Solid state continuous wave (cw) single-longitudinal-mode (SLM) lasers have attracted great interest due to their excellent properties of high output power, low noise and good beam quality. This kind of laser is widely used in a variety of application fields, such as cold atom physics, precise measurements, quantum optics, and so on [1,2,3]. It is known that introducing nonlinear loss via ICSHG is an effective approach to suppress mode hopping and improve the stability of a SLM laser [12,13,14], but how to suppress MLM operation at a high pump power and obtain high power stable SLM lasers was seldom investigated, especially for 1342 nm lasers, to the best of our knowledge
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