%A Lei LI, Changming ZHAO, Suhui YANG %T Laser detection by electronic instead of optical heterodyne using a two-frequency laser %0 Journal Article %D 2008 %J Front. Optoelectron. %J Frontiers of Optoelectronics %@ 2095-2759 %R 10.1007/s12200-008-0076-3 %P 237-240 %V 1 %N 3-4 %U {https://journal.hep.com.cn/foe/EN/10.1007/s12200-008-0076-3 %8 2008-08-05 %X

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.