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Stabilized master laser system for differential absorption lidar

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Abstract

Wavelength accuracy and stability are key requirements for differential absorption lidar (DIAL). We present a control and timing design for the dual-stabilized cw master lasers in a pulsed master-oscillator power-amplifier configuration, which forms a robust low-cost water-vapor DIAL transmitter system. This design operates at 823nm for water-vapor spectroscopy using Fabry–Perot-type laser diodes. However, the techniques described could be applied to other laser technologies at other wavelengths. The system can be extended with additional off-line or side-line wavelengths. The on-line master laser is locked to the center of a water absorption line, while the beat frequency between the on-line and the off-line is locked to 16GHz using only a bandpass microwave filter and low-frequency electronics. Optical frequency stabilities of the order of 1MHz are achieved.

© 2010 Optical Society of America

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