15 October 2015 Compensation system for FM-to-AM effects in high-power laser system
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Proceedings Volume 9671, AOPC 2015: Advances in Laser Technology and Applications; 96711F (2015) https://doi.org/10.1117/12.2199901
Event: Applied Optics and Photonics China (AOPC2015), 2015, Beijing, China
Abstract
In the high-power laser facility, frequency modulation to amplitude modulation (FM-to-AM) effects has seriously affected the power balance between beams and restricted the laser flux levels of safe operation in the system. For FM-to- AM effects produced by gain-narrowing effects, according to the amplifier gain-narrowing function model, after simulating and analyzing the properties of FM-to-AM effects, a corresponding compensation function is designed. Using sinusoidal compensation function, with the use of a birefringent crystal and liquid crystal modulator, adjusting the crystal angle in the range of 45 °, the center wavelength could be reduced in the magnitude of the range from 0 to 30dBm. By changing the voltage of the liquid crystal, the center wavelength could be adjusted within 1051.5-1054.5nm freely. For the regenerative amplifier with the gain of 70dB and input center wavelength of 1053nm and bandwidth of 0.7nm, the output FM-to-AM magnitude could be controlled within ~11% by this compensation system.
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Zuiyu Chen, Zuiyu Chen, Youen Jiang, Youen Jiang, Jiangfeng Wang, Jiangfeng Wang, Wei Fan, Wei Fan, Xuechun Li, Xuechun Li, } "Compensation system for FM-to-AM effects in high-power laser system", Proc. SPIE 9671, AOPC 2015: Advances in Laser Technology and Applications, 96711F (15 October 2015); doi: 10.1117/12.2199901; https://doi.org/10.1117/12.2199901
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