Coherence length tunable solid-state lasers based on Fabry-Perot etalon

A coherence length tunable solid-state laser based on Fabry-Perot (F-P) etalon with high stability is constructed. Principles of the coherence length tuning method by rotating the F-P etalon are theoretically analyzed and experimentally verified. By using Nd:YAG as the gain medium, an all-solid-state 1064 nm laser with 375 mW output power, 0.37% high power stability(RMS), high beam quality, and tunable coherence lengths from 9.37 cm to 20.05 cm is achieved. This method could be extended to multiband center wavelengths for their tuning of coherence length.