Self-polarization emission based on coherent combination of intracavity eigenmodes in Nd:YAG/Cr<sup>4+</sup>:YAG lasers

Kaifei Tang; Wenbin Liao; Da Lin; Bingxuan Li; Weidong Chen; Ge Zhang

doi:10.3788/COL202119.021401

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Received: Aug. 6, 2020

Accepted: Sep. 4, 2020

Posted: Dec. 14, 2020

Published Online: Jan. 4, 2021

The Author Email: Weidong Chen (Chenweidong@fjirsm.ac.cn)

DOI: 10.3788/COL202119.021401

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Kaifei Tang, Wenbin Liao, Da Lin, Bingxuan Li, Weidong Chen, Ge Zhang. Self-polarization emission based on coherent combination of intracavity eigenmodes in Nd:YAG/Cr⁴⁺:YAG lasers[J]. Chinese Optics Letters, 2021, 19(2): 021401

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Lasers, Optical Amplifiers, and Laser Optics

Chinese Optics Letters, Vol. 19, Issue 2, 021401 (2021)

Self-polarization emission based on coherent combination of intracavity eigenmodes in Nd:YAG/Cr⁴⁺:YAG lasers

Kaifei Tang^1,2, Wenbin Liao^2,3, Da Lin^2,4, Bingxuan Li^2,3, Weidong Chen^2,*, and Ge Zhang^2,3,5

Author Affiliations
¹College of Chemistry, Fuzhou University, Fuzhou 350108, China
²Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China
³Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou 350108, China
⁴University of Chinese Academy of Sciences, Beijing 100049, China
⁵Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices, Fuzhou 350108, China

Abstract

The behavior of self-polarization emission in $Nd : Y_{3} {Al}_{5} O_{12} (YAG) / {Cr}^{4 +} : YAG$ lasers has been proved in some cases. However, the degree and direction of polarization were often sensitive and unstable. We experimentally observed different beam profiles versus the angle of the polarizer relative to the polarization direction of the laser. In order to explore the polarization mechanism, the dynamics of intracavity polarized eigenmodes was analyzed theoretically. Simulative results were well consistent with our experimental observations. It indicated that the linear self-polarization emission was a composite state rather than an intrinsic state. This study contributed to the improvement of the polarization stability in $Nd : YAG / {Cr}^{4 +} : YAG$ passively Q-switched lasers.