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Frequency jitter and spectral width of an injection-seeded Q-switched Nd:YAG laser for a Doppler wind lidar

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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.

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Authors and Affiliations

  1. Institut für Physik der Atmosphäre, Deutsches Zentrum für Luft- und Raumfahrt (DLR) e.V., 82234, Weßling, Germany

    T. Schröder, C. Lemmerz, O. Reitebuch & M. Wirth

  2. EADS Astrium GmbH, Earth Observation & Science, Ludwig-Bölkow-Allee, 85821, Ottobrunn, Germany

    C. Wührer

  3. EADS Astrium GmbH, Earth Observation & Science, 88039, Friedrichshafen, Germany

    R. Treichel

Authors
  1. T. Schröder
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  2. C. Lemmerz
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  3. O. Reitebuch
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  4. M. Wirth
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  5. C. Wührer
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  6. R. Treichel
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Corresponding author

Correspondence to O. Reitebuch.

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PACS

42.55.Xi; 42.60.Lh; 42.68.Wt

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Schröder, T., Lemmerz, C., Reitebuch, O. et al. Frequency jitter and spectral width of an injection-seeded Q-switched Nd:YAG laser for a Doppler wind lidar. Appl. Phys. B 87, 437–444 (2007). https://doi.org/10.1007/s00340-007-2627-5

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  • DOI: https://doi.org/10.1007/s00340-007-2627-5

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