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Stabilized master laser system for differential absorption lidar.

Alex Dinovitser1, Murray W Hamilton, Robert A Vincent

  • 1The University of Adelaide, Adelaide, SA 5005, Australia. alex.dinovitser@adelaide.edu.au

Applied Optics
|June 12, 2010
PubMed
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Accurate wavelength control is crucial for differential absorption lidar (DIAL) systems. This study presents a low-cost design for dual-stabilized master lasers, achieving 1 MHz optical frequency stability for water vapor DIAL.

Area of Science:

  • Optical Engineering
  • Spectroscopy
  • Atmospheric Science

Background:

  • Wavelength accuracy and stability are critical for differential absorption lidar (DIAL) performance.
  • Existing DIAL systems require precise laser control for reliable atmospheric measurements.
  • Water vapor DIAL systems specifically need stable laser sources operating at relevant absorption lines.

Purpose of the Study:

  • To present a control and timing design for dual-stabilized continuous-wave (cw) master lasers for a pulsed master-oscillator power-amplifier configuration.
  • To develop a robust, low-cost transmitter system for water vapor DIAL.
  • To achieve high optical frequency stability for DIAL applications.

Main Methods:

  • Utilized Fabry-Perot-type laser diodes operating at 823 nm for water vapor spectroscopy.

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  • Implemented a control system locking the on-line master laser to a water absorption line center.
  • Employed a bandpass microwave filter and low-frequency electronics to lock the beat frequency between on-line and off-line lasers to 16 GHz.

    • Main Results:

    • Achieved optical frequency stabilities on the order of 1 MHz.
    • Demonstrated a robust and low-cost water vapor DIAL transmitter system.
    • The presented techniques are adaptable to other laser technologies and wavelengths.

    Conclusions:

    • The developed control and timing design ensures high wavelength accuracy and stability for DIAL systems.
    • The system's low-cost nature and robustness make it suitable for practical water vapor monitoring.
    • The design's modularity allows for extension to additional wavelengths, enhancing its versatility.