NDLI: Study of Offset Frequency Locking and Active Frequency Stabilization for Two RF-Excited Waveguide CO<sub>2</sub> Laser With Common Ground Electrode

Content Provider	IEEE Xplore Digital Library
Author	Yanchao Zhang Zhaoshuo Tian Zhenghe Sun Shiyou Fu
Copyright Year	1965
Abstract	In this paper, we designed the offset frequency locking and active frequency stabilization system for the continuous-wave (CW) and electro-optical Q-switched RF-excited waveguide CO₂ lasers to provide an ideal light source for coherent radar. The CW laser is used as a local laser, and the pulsed laser is used as a main laser, which can produce Q-switched and cavity-dumped laser synchronously. A closed-loop laser frequency control system was used to stabilize the Q-switched laser at the gain curve center frequency and to lock the two lasers at a selected heterodyne frequency. The system includes two parts: 1) pulsed laser frequency stabilization and 2) offset frequency locking. The frequency stabilization part can keep the Q-switched laser oscillating at the peak of the gain curve by measuring the pulse build-up time continuously and controlling the cavity length. The offset frequency locking circuits keep the heterodyne frequency around the selected frequency by measuring the frequency of the beat signals and controlling the CW laser cavity length. In the experiment, the long-term frequency shift of the pulse laser was measured to be less than ±16 MHz and the offset frequency fluctuation was less than ±2 MHz when the frequency control system was in a closed-loop operation.
Sponsorship	IEEE Lasers and Electro-Optics Society
Starting Page	802
Ending Page	807
Page Count	6
File Size	2103716
File Format	PDF
ISSN	00189197
Volume Number	50
Issue Number	10
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Laser stability Laser radar Waveguide lasers Frequency control Measurement by laser beam Time-frequency analysis frequency control Gas lasers laser stability
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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