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High-speed acousto-optic shutter with no optical frequency shift.

W J Schwenger1, J M Higbie

  • 1Martin A. Fisher School of Physics, Brandeis University, Waltham, Massachusetts 02453, USA.

The Review of Scientific Instruments
|September 4, 2012
PubMed
Summary
This summary is machine-generated.

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This study introduces a novel acousto-optic shutter that rapidly switches laser power without altering the laser frequency. This advancement simplifies optical systems by eliminating the need for frequency compensation, offering a more efficient solution for laser beam control.

Area of Science:

  • Optics and Photonics
  • Laser Technology

Background:

  • Acousto-optic modulators (AOMs) are standard for high-speed laser beam control.
  • Acousto-optic modulators typically induce a frequency shift in the laser beam, complicating system design.
  • Compensating for this frequency shift requires additional optical components and complexity.

Purpose of the Study:

  • To develop a method for rapid laser power switching using acousto-optic modulation.
  • To eliminate the undesirable frequency shift associated with conventional acousto-optic modulators.
  • To provide a simplified and efficient solution for laser beam modulation.

Main Methods:

  • Implementation of a novel acousto-optic shutter design.
  • Utilizing acoustic waves to modulate laser power.

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  • Characterization of switching time, extinction ratio, and efficiency.

    • Main Results:

    • Demonstrated rapid laser power switching with a switching time of approximately 25 ns.
    • Achieved a high extinction ratio of 46 dB, ensuring effective beam blocking.
    • Obtained efficiency comparable to conventional double-pass acousto-optic modulator setups.

    Conclusions:

    • The developed acousto-optic shutter provides effective laser power switching without frequency shift.
    • This method offers a simplified approach for laser systems requiring rapid modulation.
    • The technology presents a viable alternative to conventional acousto-optic modulators for specific applications.