In the doppler wind lidar, usually every 4MHz frequency error will produce
wind error of 1m/s of 532nm laser. In the Doppler lidar system, frequency
stabilization was achieved through absorption of iodine molecules. Commands that
control the instrumental system were based on the PID algorithm and coded using VB
language. The frequency of the seed laser was locked to iodine molecular absorption
line 1109 which is close to the upper edge of the absorption range, with long-time
(>4h) frequency-locking accuracy being≤0.5MHz and long-time frequency stability
being 10-9 . The experimental result indicated that the seed frequency and the pulse
laser frequency have a deviation, which effect is called the laser chirp characteristics.
Finally chirp test system was constructed and tested the frequency offset in time. And
such frequency deviation is known as Chirp of the laser pulse. The real-time measured
frequency difference of the continuous and pulsed lights was about 10MHz, long-time
stability deviation was around 5MHz. After experimental testing technology mature,
which can monitoring the signal at long-term with corrected the wind speed.
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