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Related Experiment Videos

Compact, fiber-compatible, cascaded Raman laser.

Bumki Min1, Tobias J Kippenberg, Kerry J Vahala

  • 1Department of Applied Physics, California Institute of Technology, Pasadena, California 91125, USA.

Optics Letters
|September 6, 2003
PubMed
Summary

Cascaded Raman Stokes lasing was achieved in a silica microsphere resonator. This study demonstrates five distinct lasing lines with low threshold power, offering insights into nonlinear optics.

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Area of Science:

  • Photonics
  • Nonlinear Optics
  • Optical Resonators

Background:

  • Ultrahigh-Q silica microsphere resonators are crucial for nonlinear optical phenomena.
  • Tapered fiber coupling enables efficient light interaction with microresonators.
  • Raman Stokes lasing is a key process for generating new optical frequencies.

Purpose of the Study:

  • To demonstrate and analyze cascaded Raman Stokes lasing in a silica microsphere resonator.
  • To investigate the threshold power and characteristics of the generated lasing lines.
  • To validate theoretical predictions regarding Stokes lasing behavior.

Main Methods:

  • Fabrication of an ultrahigh-Q silica microsphere resonator.
  • Coupling the microsphere to a tapered optical fiber.
  • Pumping the system with a 980 nm laser source.
  • Analyzing the generated cascaded Raman Stokes lasing lines.

Main Results:

  • Successful demonstration of cascaded Raman Stokes lasing.
  • Generation of five distinct Stokes lasing lines.
  • Achieved a low threshold power of 56.4 microwatts for first-order Stokes lasing.
  • Observed distinct spectral characteristics for different Stokes orders.

Conclusions:

  • Cascaded Raman Stokes lasing is efficiently generated in silica microsphere resonators.
  • The experimental results align with theoretical predictions.
  • This work highlights the potential of microsphere resonators for nonlinear optical applications.

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