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Low-threshold ultraviolet solid-state laser based on a Ce3+:LiCaAlF6 crystal resonator.

Thanh Le1, Steven J Schowalter, Wade Rellergert

  • 1Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91009, USA.

Optics Letters
|December 4, 2012
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Researchers developed a low-threshold solid-state ultraviolet laser using a whispering gallery mode (WGM) resonator. This novel UV laser design achieves broad bandwidth lasing with significantly reduced pump power requirements.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Laser Physics

Background:

  • Whispering gallery mode (WGM) resonators offer high quality factors (Q) and small mode volumes, ideal for low-threshold lasing.
  • Solid-state ultraviolet (UV) lasers are crucial for various applications, but achieving low thresholds remains a challenge.

Purpose of the Study:

  • To demonstrate a low-threshold solid-state UV laser utilizing a WGM resonator.
  • To investigate the lasing properties and dynamics of such a system.

Main Methods:

  • Fabrication of a UV-transparent crystalline WGM resonator using Ce3+:LiCaAlF6 material.
  • Characterization of lasing performance, including threshold intensity, bandwidth, and slope efficiency.
  • Analysis of time delay dynamics in pulsed operation.

Main Results:

  • Broad bandwidth lasing achieved between 280-330 nm.
  • Low threshold intensity of 7.5×10^9 W/m^2 and an effective slope efficiency of ~25%.
  • Realization of a LiCaAlF6 WGM resonator with a high Q factor of 2×10^7 at 370 nm.

Conclusions:

  • The WGM resonator design significantly lowers the pump power threshold compared to traditional cavities.
  • This advancement enables tunable continuous-wave and mode-locked UV laser operation.
  • The developed solid-state UV laser holds promise for advanced optical applications.