Laser detection by electronic instead of optical heterodyne using a two-frequency laser

doi:10.1007/s12200-008-0076-3

Front Optoelec Chin

2008, Vol. 1

Issue (3-4) : 237-240 https://doi.org/10.1007/s12200-008-0076-3

Research Article

Laser detection by electronic instead of optical heterodyne using a two-frequency laser

Lei LI¹(

), Changming ZHAO², Suhui YANG²

1. Shanghai Institute of Optics and Fine Mechanics; 2. School of Information Science and Technology, Beijing Institute of Technology

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Abstract

A laser ranging system using a two-frequency laser is demonstrated, and the lidar-radar concept is introduced. A laser beam carrying 100 MHz radio frequency is obtained by a monolithic nonplanar ring single-frequency oscillator and an acousto-optical modulator, which is used as the light source of the two-frequency detecting experimental setup. With the optical transmitting and collecting system, the displacement information of a target mounted on a motorized translation stage is achieved. In signal processing, the displacement is obtained by calculating the phase difference between the reference and detection signals executed by a radio-frequency lock-in amplifier. The ranging system turns the optical heterodyne into an electronic demodulation, and the repetition error is less than 3%. The system takes advantage of the signal processing technologies of radar, and meanwhile maintains the advantages of laser detection.

Keywords lidar-radar two-frequency laser beat frequency heterodyne

Corresponding Author(s): LI Lei,Email:lilei@siom.ac.cn

Issue Date: 05 September 2009

Cite this article:

Lei LI,Changming ZHAO,Suhui YANG. Laser detection by electronic instead of optical heterodyne using a two-frequency laser[J]. Front Optoelec Chin, 2008, 1(3-4): 237-240.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-008-0076-3
https://academic.hep.com.cn/foe/EN/Y2008/V1/I3-4/237

Fig0 Experimental setup of displacement detection(HWP – half-wave plate; PBS – polarized beam splitter; QWP – quarter-wave plate)

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