Research on heterodyne detection of a mode-locked pulse laser based on an acousto-optic frequency shift
Applied Optics, Vol. 49, Issue 20, pp. 4018-4023 (2010)
http://dx.doi.org/10.1364/AO.49.004018
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Abstract
Heterodyne detection research is carried out on a mode-locked pulse laser using an acousto-optic frequency shifter (AOFS). Theoretical calculation and numerical simulation of the beat frequency of the mode-locked pulse were carried out, and the results show that the frequency offset can be calculated according to the beat period of the pulse waveform, and the offset is the frequency difference between the two adjacent longitudinal modes. Experiments were implemented with a self-built mode-locked laser using an AOFS to simulate the frequency shift of the detection laser induced by the object, the coherent beat frequency of the signal light and local oscillation light that were observed on the surface of the detector. The beat frequency wave was processed by filtering to obtain the frequency shift of the signal light. The experimental results are in good agreement with the numerical simulation.
© 2010 Optical Society of America
OCIS Codes
(040.2840) Detectors : Heterodyne
(070.1060) Fourier optics and signal processing : Acousto-optical signal processing
(140.3580) Lasers and laser optics : Lasers, solid-state
(140.4050) Lasers and laser optics : Mode-locked lasers
ToC Category:
Detectors
History
Original Manuscript: April 7, 2010
Revised Manuscript: June 15, 2010
Manuscript Accepted: June 23, 2010
Published: July 9, 2010
Citation
Yan Bai, Deming Ren, Weijiang Zhao, Liming Qian, Zhenlei Chen, and Yan Liu, "Research on heterodyne detection of a mode-locked pulse laser based on an acousto-optic frequency shift," Appl. Opt. 49, 4018-4023 (2010)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-49-20-4018
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