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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 23 — Nov. 12, 2007
  • pp: 15523–15530

Versatile opto-fluidic ring resonator lasers with ultra-low threshold

Scott Lacey, Ian M. White, Yuze Sun, Siyka I. Shopova, Jay M. Cupps, Po Zhang, and Xudong Fan  »View Author Affiliations

Optics Express, Vol. 15, Issue 23, pp. 15523-15530 (2007)

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We develop a versatile integrated opto-fluidic ring resonator (OFRR) dye laser that can be operated regardless of the refractive index (RI) of the liquid. The OFRR is a micro-sized glass capillary with a wall thickness of a few micrometers. When the liquid in the core has an RI lower than that of the capillary wall (n=1.45), the capillary circular cross-section forms the ring resonator and supports the whispering gallery modes (WGMs) that interact evanescently with the gain medium in the core. When the core RI is higher than that of the wall, the WGMs exist at the core/wall interface. In both cases, the WGMs can have extremely high Q-factor (>109), providing excellent optical feedback for low-threshold lasing. In this paper, we analyze the OFRR laser for various core RI’s and then we demonstrate the R6G laser when the dye is in ethanol (n=1.36), chloroform (n=1.445), and quinoline (n=1.626). The lasing threshold of 25 nJ/mm2 is achieved, two to three orders of magnitude lower than the previous work in microfluidic lasers. We further show that the laser emission can be efficiently out-coupled via an optical waveguide in touch with the OFRR for both high and low RI liquid core, allowing for easy guiding and delivery of the laser light.

© 2007 Optical Society of America

OCIS Codes
(140.2050) Lasers and laser optics : Dye lasers
(170.4520) Medical optics and biotechnology : Optical confinement and manipulation
(230.3990) Optical devices : Micro-optical devices
(230.5750) Optical devices : Resonators

ToC Category:
Lasers and Laser Optics

Original Manuscript: October 11, 2007
Revised Manuscript: November 2, 2007
Manuscript Accepted: November 3, 2007
Published: November 8, 2007

Virtual Issues
Vol. 2, Iss. 12 Virtual Journal for Biomedical Optics

Scott Lacey, Ian M. White, Yuze Sun, Siyka I. Shopova, Jay M. Cupps, Po Zhang, and Xudong Fan, "Versatile opto-fluidic ring resonator lasers with ultra-low threshold," Opt. Express 15, 15523-15530 (2007)

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