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Proceedings Paper

Investigation on offset frequency locking system for a short-pulse laser
Author(s): Rui Yao; Qi Li; Kai Xue; Qi Wang
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Paper Abstract

Offset frequency locking is widely applied in laser detection, frequency stabilization of lasers, laser accurate measurement and laser spectroscopy. In the paper, an offset frequency locking system based on Field Programmable Gate Array (FPGA) is designed and applied for cavity-dumped CO2 waveguide laser with two channels and common electrodes. A scheme for all-digital frequency discriminator in the system is described in the paper. The frequency discriminating precision of single pulse is improved by designing a high speed counter which could count both the rising edges and falling edges of signals. The multi-pulse discrimination and the high probability mean filtering algorithm are used to further improve the discriminating precision. At the same time, the algorithm of variable step length and segmental approximation is used to improve the speed and precision of frequency modulation. The experimental results show that with the method of multi-pulse discrimination the beat frequency is stabilized within ±10MHz.

Paper Details

Date Published: 28 August 2009
PDF: 6 pages
Proc. SPIE 7382, International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging, 738228 (28 August 2009); doi: 10.1117/12.833427
Show Author Affiliations
Rui Yao, Harbin Institute of Technology (China)
Qi Li, Harbin Institute of Technology (China)
Kai Xue, Harbin Institute of Technology (China)
Qi Wang, Harbin Institute of Technology (China)

Published in SPIE Proceedings Vol. 7382:
International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging
Farzin Amzajerdian; Chun-qing Gao; Tian-yu Xie, Editor(s)

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