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Related Experiment Videos

High-speed random access laser tuning.

D C Thompson1, G E Busch, C J Hewitt

  • 1Los Alamos National Laboratory, MS E548, Los Alamos, New Mexico 87545, USA. dcthomp@lanl.gov

Applied Optics
|March 6, 2008
PubMed
Summary
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A new technique uses acousto-optic modulators for rapid laser tuning (100 kHz+) and control. This electronic method offers advanced features for lasers, surpassing mechanical limitations in speed and precision.

Area of Science:

  • Optics and Photonics
  • Laser Technology
  • Acousto-Optics

Background:

  • Conventional laser tuning methods using mechanical components are limited in speed and precision.
  • Rapidly controlling laser parameters is crucial for advanced applications like lidar and spectroscopy.

Purpose of the Study:

  • To develop a novel technique for high-speed laser tuning and parameter control.
  • To demonstrate the capabilities of acousto-optic modulators for advanced laser functionalities.

Main Methods:

  • Utilized a pair of acousto-optic modulators for laser tuning and control.
  • Employed electronic control of acoustic frequency to determine the selected laser wavelength.
  • Operated modulators at a fixed Bragg angle to enhance wavelength resolution.

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Main Results:

  • Achieved laser tuning rates of 100 kHz or more.
  • Demonstrated 70 kHz tuning on a CO2 laser, accessing over 50 lines with 17% wavelength range.
  • Attained wavelength discrimination better than 1 part in 1000.
  • Integrated a compact tuner and Q-switch into a pulsed lidar system.

Conclusions:

  • The acousto-optic modulator technique enables unprecedented electronic control over laser wavelength, Q-switching, and other parameters.
  • This method significantly surpasses the speed and capabilities of traditional mechanical tuning components.
  • The developed system is suitable for high-repetition-rate pulsed laser applications, including lidar.