Coherent 1.06-um cw laser radar system

Su Hui Yang; Ke Ying Wu; Chang Ming Zhao; Guang Hui Wei

doi:10.1117/12.401747

5 October 2000 Coherent 1.06-μm cw laser radar system

Su Hui Yang, Ke Ying Wu, Chang Ming Zhao, Guang Hui Wei

Proceedings Volume 4223, Instruments for Optics and Optoelectronic Inspection and Control; (2000) https://doi.org/10.1117/12.401747
Event: Optics and Optoelectronic Inspection and Control: Techniques, Applications, and Instruments, 2000, Beijing, China

Abstract

A coherent 1.06micrometers all solid state laser radar system is proposed. The system uses a LD pumped monolithic Nd:YAG ring laser as the source. Very stable output of the laser is linearly frequency modulated by an acousto-optic modulator. The wide modulation bandwidth is achieved by cascading two Bragg cells, in which each cell produces half of the total bandwidth. In order to extinguish the laser beam deflection caused by the Bragg cell, the propagation directions for the acoustic waves are arranged to be opposite in the two cells. Two single model optical fiber couplers are utilized. One is used as a beam splitter and divides the modulated laser beam into two parts: the transmitted signal beam and the local reference beam. The other coupler mixes the target-reflected signal beam with the local reference beam. The output signal form this coupler is detected by an InGaAs PIN photodiode, then analyzed by a RF electronic spectrum analyzer. The linearly frequency modulated CW ladar system can be applied for measuring both range and velocity of the target. Using this ladar system, true 3D target imaging can be achieved by additional use of a laser beam-scanning device.

Citation Download Citation

Su Hui Yang, Ke Ying Wu, Chang Ming Zhao, and Guang Hui Wei "Coherent 1.06-μm cw laser radar system", Proc. SPIE 4223, Instruments for Optics and Optoelectronic Inspection and Control, (5 October 2000); https://doi.org/10.1117/12.401747

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KEYWORDS

LIDAR

Modulation

Bragg cells

Beam splitters

Oscillators

Nd:YAG lasers

Signal detection

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