Frontiers of Optoelectronics, Volume. 1, Issue 3, 237(2008)

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

Lei LI1、*, Changming ZHAO2, and Suhui YANG2
Author Affiliations
  • 1Shanghai Institute of Optics and Fine Mechanics, Shanghai 201800, China
  • 2School of Information Science and Technology, Beijing Institute of Technology, Beijing 100081, China
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    Alaser ranging system using a two-frequency laser is demonstrated, and the lidar-radar concept is introduced. A laser beamcarrying 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.

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

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    Paper Information

    Received: --

    Accepted: --

    Published Online: Nov. 6, 2012

    The Author Email: LI Lei (lilei@siom.ac.cn)

    DOI:10.1007/s12200-008-0076-3

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