Thermal Analysis of Acousto-Optic Modulators and Its Influence on Ultra-Stable Lasers
Pengyang Zhao,
Fanchao Meng,
Junyang Xiong,
Jianjun Jia,
Lingqiang Meng,
Hongxing Qi
Affiliations
Pengyang Zhao
Taiji Laboratory for Gravitational Wave Universe, School of Physics and Photoelectronic Engineering, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China
Fanchao Meng
Taiji Laboratory for Gravitational Wave Universe, School of Physics and Photoelectronic Engineering, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China
Junyang Xiong
Taiji Laboratory for Gravitational Wave Universe, School of Physics and Photoelectronic Engineering, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China
Jianjun Jia
Taiji Laboratory for Gravitational Wave Universe, School of Physics and Photoelectronic Engineering, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China
Lingqiang Meng
Taiji Laboratory for Gravitational Wave Universe, School of Physics and Photoelectronic Engineering, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China
Hongxing Qi
Taiji Laboratory for Gravitational Wave Universe, School of Physics and Photoelectronic Engineering, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China
Acousto-optic modulators (AOMs) have been widely used in ultra-stable lasers (USLs) for optimizing its performances. A thermal theoretical model of the AOM, which is made by TeO2, was established. Based on the model, the temperature coefficients of the diffraction angle and efficiency were calculated to be 4.051 μrad/°C and 0.018%/°C. The influences of thermal effects of the AOM on USLs’ cavity coupling and frequency stability were firstly studied. A 1 °C temperature change in the AOM results in a 0.31 Hz frequency fluctuation of the laser within the USL cavity. Simulation and experimental results indicate that, to achieve USLs’ optimal performance, thermal effects of AOMs within the system must be addressed and managed.
