Laser detection by electronic instead of optical heterodyne using a two-frequency laser |
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Authors: | Lei LI Changming ZHAO Suhui YANG |
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Affiliation: | 1. Shanghai Institute of Optics and Fine Mechanics, Shanghai 201800, China 2. School of Information Science and Technology, Beijing Institute of Technology, Beijing 100081, China |
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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. |
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Keywords: | lidar-radar two-frequency laser beat frequency heterodyne |
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