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Ultraviolet single-frequency coupled optofluidic ring resonator dye laser.

Xin Tu1, Xiang Wu, Ming Li

  • 1Key Lab for Micro and Nanophotonic Structures (Ministry of Education), Department of Optical Science and Engineering, School of Information Science and Engineering, Fudan University, Shanghai 200433, China.

Optics Express
|October 6, 2012
PubMed
Summary

Researchers achieved ultraviolet single-frequency lasing in a novel coupled optofluidic ring resonator (COFRR) dye laser. This breakthrough enables efficient, narrow-beam laser emission at 386.75 nm.

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Area of Science:

  • Optics and Photonics
  • Laser Physics
  • Microfluidics

Background:

  • Whispering gallery modes (WGMs) are crucial for laser operation in micro-resonators.
  • Optofluidic lasers offer tunable and compact laser sources.

Purpose of the Study:

  • To demonstrate ultraviolet single-frequency lasing using a coupled optofluidic ring resonator (COFRR) dye laser.
  • To characterize the lasing performance, including wavelength, threshold, and beam properties.

Main Methods:

  • Fabrication of a COFRR comprising a microfluidic ring resonator and a cylindrical resonator.
  • Coupling of WGMs between the two resonators to achieve single-frequency emission.
  • Characterization of laser output at 386.75 nm.

Main Results:

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  • Achieved ultraviolet single-frequency lasing at 386.75 nm.
  • Observed a low pump threshold of 5.9 μJ/mm.
  • Attained a side-mode-suppression ratio (SMSR) of approximately 20 dB.
  • Demonstrated directional laser emission with a divergence of 10.5°.

Conclusions:

  • The COFRR design enables efficient ultraviolet single-frequency lasing.
  • The device exhibits favorable characteristics for applications requiring narrow-linewidth, directional UV light sources.