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Related Experiment Videos

Ultralow-threshold Raman lasing with CaF2 resonators.

Ivan S Grudinin1, Lute Maleki

  • 1Jet Propulsion Laboratory, California Institute of Technology, Pasadena 91109, USA. grudinin@caltech.edu

Optics Letters
|December 23, 2006
PubMed
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Researchers achieved ultra-low threshold Raman lasing using calcium fluoride (CaF2) whispering-gallery-mode resonators. This breakthrough offers a highly efficient new light source with potential for widespread applications.

Area of Science:

  • Photonics and Optical Engineering
  • Materials Science
  • Laser Physics

Background:

  • Raman lasing is a nonlinear optical process that generates new frequencies of light.
  • Achieving low-threshold Raman lasing is crucial for developing compact and efficient light sources.
  • Whispering-gallery-mode resonators offer high optical quality factors, beneficial for nonlinear optics.

Purpose of the Study:

  • To demonstrate efficient Raman lasing using calcium fluoride (CaF2) whispering-gallery-mode resonators.
  • To investigate the threshold power requirements for continuous-wave Raman lasing in CaF2 cavities.
  • To explore the potential of these resonators for generating higher-order Stokes components.

Main Methods:

  • Fabrication of CaF2 whispering-gallery-mode resonators with millimeter and micrometer dimensions.

Related Experiment Videos

  • Characterization of resonator optical quality factors (Q-factors).
  • Pumping the resonators with a continuous-wave laser to induce and measure Raman lasing.

    • Main Results:

    • Demonstrated continuous-wave Raman lasing with a threshold below 1 microW for a 5mm CaF2 cavity, orders of magnitude lower than existing sources.
    • Attributed the low threshold to the ultrahigh optical quality factor (Q ≈ 5x10^10) of the CaF2 resonators.
    • Observed up to fifth-order Stokes components at 160 microW and eighth-order at 1 mW pump power; a 15 microW threshold was seen in a 100 micrometer microcavity.

    Conclusions:

    • CaF2 whispering-gallery-mode resonators enable unprecedentedly low-threshold Raman lasing.
    • The ultrahigh Q-factor is key to achieving this efficiency.
    • These results pave the way for novel applications in spectroscopy, sensing, and integrated photonics.