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Frequency-dependent graded reflectivity mirror: characterization and laser implementation.

M Keselbrener1, S Ruschin

  • 1Department of Electrical Engineering and Physical Electronics, Faculty of Engineering, Tel Aviv University, Tel Aviv 69978, Israel.

Applied Optics
|March 8, 2008
PubMed
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We developed novel variable reflectivity mirrors using frustrated total internal reflection. These frequency-sensitive mirrors significantly reduce laser beam divergence while minimally impacting output power.

Area of Science:

  • Optics and Photonics
  • Laser Physics
  • Materials Science

Background:

  • Traditional laser resonators often employ fixed reflectivity mirrors, limiting control over beam characteristics.
  • Variable reflectivity mirrors offer potential for enhanced laser performance and mode control.
  • Frustrated total internal reflection (FTIR) and interference effects provide a basis for novel optical components.

Purpose of the Study:

  • To theoretically and experimentally investigate a new family of variable reflectivity mirrors.
  • To characterize the frequency-dependent reflectivity of these novel mirrors.
  • To evaluate the performance of these mirrors as output couplers in a Nd:YAG laser resonator.

Main Methods:

  • Theoretical modeling of frustrated total internal reflection and interference effects for mirror design.

Related Experiment Videos

  • Experimental fabrication and characterization of variable reflectivity mirrors.
  • Integration of the mirror as an output coupler in an unstable Nd:YAG laser resonator.
  • Comparison of laser performance with standard stable resonator configurations.

    • Main Results:

    • Demonstrated mirrors with significant transverse reflectivity changes (50% power reflectivity change within 8.0 GHz).
    • Observed a reduction in beam divergence by over an order of magnitude in an unstable resonator configuration.
    • Achieved only a 10% reduction in output power compared to a stable resonator.
    • Investigated laser resonator mode competition influenced by frequency-dependent mirror reflectivity.

    Conclusions:

    • The developed variable reflectivity mirrors offer a promising method for controlling laser beam divergence.
    • These frequency-sensitive mirrors enable significant improvements in beam quality with minimal power loss.
    • The findings suggest potential applications in advanced laser systems requiring precise mode control.