Chinese Optics Letters, 2023, 21 (11): 111401, Published Online: Nov. 13, 2023  

Nd:YAG linearly polarized laser based on polarization eigenmodes

Jing Wang 1,2Kaifei Tang 1Bingxuan Li 1,2,3,*Ge Zhang 1,2,3,**
Author Affiliations
1 Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China
2 University of Chinese Academy of Sciences, Beijing 100049, China
3 Fujian Science and Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou 350108, China
In this paper, the frequency difference of the eigen polarization modes of the Nd:YAG crystal laser at different polarization ratios is experimentally studied, and to the best of our knowledge, the correlation between the frequency difference of the eigenmodes and the output polarization degree is reported for the first time. Combined with the analysis of the polarization beam profile, it is proved that the polarized laser produced by the isotropic crystal is due to the frequency locking of the eigen polarization modes. The weak birefringence in the crystal causes the round-trip phase difference of the orthogonal polarization modes, which leads to the frequency difference between the polarization modes. By the adjustment of the cavity mirror, the anisotropic loss will interact with the round-trip phase difference. The eigen polarization modes can reach frequency degeneration, and then be coherently combined to produce linearly polarized laser output. This work provides a useful reference for understanding the physical mechanism of polarized lasers realized by isotropic crystals.

Jing Wang, Kaifei Tang, Bingxuan Li, Ge Zhang. Nd:YAG linearly polarized laser based on polarization eigenmodes[J]. Chinese Optics Letters, 2023, 21(11): 111401.

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