Frequency jitter and spectral width of an injection-seeded Q-switched Nd:YAG laser for a Doppler wind lidar |
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Authors: | T Schröder C Lemmerz O Reitebuch M Wirth C Wührer R Treichel |
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Institution: | 1.Institut für Physik der Atmosph?re,Deutsches Zentrum für Luft- und Raumfahrt (DLR) e.V.,We?ling,Germany;2.EADS Astrium GmbH, Earth Observation & Science,Ottobrunn,Germany;3.EADS Astrium GmbH, Earth Observation & Science,Friedrichshafen,Germany |
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Abstract: | The design of a 50 Hz single longitudinal mode, diode-pumped and frequency-tripled Nd:YAG master oscillator power amplifier
is described, and the first measurements of output parameters are presented. The laser oscillator is injection-seeded by a
tuneable monolithic Nd:YAG ring laser and frequency stabilized by minimising the Q-switch build-up time. The laser system
will be an integral part of an airborne instrument demonstrator for a first satellite based Doppler wind lidar to measure
vertical profiles of one component of the atmospheric wind vector. This paper focuses on the investigation of the frequency
jitter and the linewidth of the laser, which are measured on a pulse-to-pulse basis. For this purpose a compact, high accuracy
beat frequency monitoring system has been developed at DLR. By operating the amplifier stage at half the repetition rate (50 Hz)
of the oscillator, we could reduce the frequency stability from 10 MHz (rms) to 1.3 MHz (rms) (over a 14 s period). We have
determined a mean linewidth of 15 MHz (FWHM) at 1064 nm. These measured laser parameters enable wind velocity measurements
in the atmosphere (0–15 km) at an accuracy of 1 to 2 m/s.
PACS 42.55.Xi; 42.60.Lh; 42.68.Wt |
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