Abstract

The Doppler detection schemes, effective at high frequency instabilities of laser sources are of great interest for lidar performance. The stability of ≈ 10⁻⁹ is required to realize ≈ ± 1 m/s accuracy of wind speed [1,2]. Doppler detection schemes on the intermediate frequency opera ting at stabilities of order of 10⁻⁷ ÷ 10⁻⁶ are described here, based on the so-called tracking heterodyne [3,4] and the proper lidar synchronization.

© 1991 Optical Society of America