Abstract
We demonstrate a tunable wavelength-locked seed laser source with
high-frequency stability to realize the precise measurements of global atmospheric
wind field. An Nd:YAG laser at 1 064 nm is used as the master laser (ML). Its
frequency is locked to a confocal Fabry-Perot interferometer by using the
Pound-Drever-Hall method, which ensures the peak-to-peak value of its frequency
drifts less than 180 kHz over 2 h. Another Nd:YAG laser at 1 064 nm, as the slave
laser, is offset-locked to the above ML using optical phase locked loop, retaining
virtually the same absolute frequency stability as the ML. The tunable ranges of the
frequency differences between two lasers are up to 3 GHz, and the tuning step length
was an arbitrary integral multiple of 200 kHz. The researched seed laser source is
compact and robust, which can well satisfy the requirement of the Doppler wind
lidar.
© 2012 Chinese Optics Letters
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