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Proceedings Paper

Dual-frequency multifunction lidar
Author(s): Rosemary Diaz; Sze-Chun Chan; Jia-Ming Liu
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Paper Abstract

The design and performance of a multifunction continuous wave dual-frequency lidar system is presented. The system is based on the use of the nonlinear dynamics of an optically injected semiconductor laser. Under proper operating conditions, the laser emits a dual-frequency beam with a broadly tunable microwave separation. The two optical lines are coherently locked to each other using an external microwave synthesizer, resulting in a stable microwave beat frequency. The lidar system is capable of simultaneous velocity and range measurement of remote targets. The velocity is measured from the Doppler shift of the microwave beat frequency. The stability of the microwave beat frequency enables accurate measurement of low velocities. In addition, the stable locking enables long-range measurements because of the long microwave coherence length. Ranging is accomplished by extracting the time-of-flight information carried on the residual microwave phase noise. We demonstrate preliminary measurements of velocities as low as 26 &mgr;m/s and range measurements of 7.95 km with 2 % accuracy.

Paper Details

Date Published: 12 February 2007
PDF: 10 pages
Proc. SPIE 6457, Free-Space Laser Communication Technologies XIX and Atmospheric Propagation of Electromagnetic Waves, 64570O (12 February 2007); doi: 10.1117/12.699822
Show Author Affiliations
Rosemary Diaz, Univ. of California, Los Angeles (United States)
Sze-Chun Chan, Univ. of California, Los Angeles (United States)
Jia-Ming Liu, Univ. of California, Los Angeles (United States)


Published in SPIE Proceedings Vol. 6457:
Free-Space Laser Communication Technologies XIX and Atmospheric Propagation of Electromagnetic Waves
Steve Mecherle; Olga Korotkova, Editor(s)

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