Laser frequency locking system using orthogonally demodulated Pound–Drever–Hall method

Juan Su; Mingxing Jiao; Fei Jiang; Junhong Xing

doi:10.1117/12.2510863

7 March 2019 Laser frequency locking system using orthogonally demodulated Pound–Drever–Hall method

Juan Su, Mingxing Jiao, Fei Jiang, Junhong Xing

Proceedings Volume 11053, Tenth International Symposium on Precision Engineering Measurements and Instrumentation; 110531B (2019) https://doi.org/10.1117/12.2510863
Event: 10th International Symposium on Precision Engineering Measurements and Instrumentation (ISPEMI 2018), 2018, Kunming, China

Abstract

Based on the principle of orthogonal demodulation, a Pound-Drever-Hall laser frequency locking scheme is developed. In the orthogonal demodulation Pound-Drever-Hall system, three sine signals are generated simultaneously using a direct digital synthesizer. A 0° phase sine signal is used to drive an electro-optic modulator to produce the phase sidebands, and 180° and 270° phase sine signals are used as reference signals for phase demodulation. The phase-modulated laser beam is coupled with a reference Fabry–Pérot cavity, and the reflected beam is sent into a photo-detector, whose output is mixed with two orthogonal reference signals to obtain two orthogonal components of the error signal. Using an analogto- digital converter, the two orthogonal components are processed using orthogonal phase sensitive detection to obtain the error signal on a host computer. The Pound-Drever-Hall laser frequency discrimination and tracking system is established and investigated experimentally using the orthogonal demodulation method. A frequency discrimination curve is obtained, and it is observed that the resonant frequency of the Fabry–Pérot cavity can automatically track laser frequency variation.

Citation Download Citation

Juan Su, Mingxing Jiao, Fei Jiang, and Junhong Xing "Laser frequency locking system using orthogonally demodulated Pound–Drever–Hall method", Proc. SPIE 11053, Tenth International Symposium on Precision Engineering Measurements and Instrumentation, 110531B (7 March 2019); https://doi.org/10.1117/12.2510863

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KEYWORDS

Demodulation

Laser systems engineering

Modulation

Laser stabilization

Phase shift keying

Signal processing

Digital signal processing

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