Versatile opto-fluidic ring resonator lasers with ultra-low threshold
Versatile opto-fluidic ring resonator lasers with ultra-low threshold
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DOI：
10.1364/oe.15.015523
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发表时间：
2007-11-12
期刊：
影响因子：
3.8
通讯作者：
Fan, Xudong
中科院分区：
文献类型：
--
作者：
Lacey, Scott;White, Ian M.;Fan, Xudong
我们研制了一种多功能的集成光流控环形谐振腔（OFRR）染料激光器，它可以不受液体折射率（RI）的影响而工作。OFRR是一种壁厚为几微米的微型玻璃毛细管。当芯中的液体具有比毛细管壁的RI低的RI（n= 1.45）时，毛细管圆形横截面形成环形谐振器并且支持与芯中的增益介质渐逝地相互作用的回音壁模式（WGM）。当芯部RI高于壁部RI时，WGM存在于芯部/壁部界面。在这两种情况下，WGM可以具有极高的Q因子（> 10（9）），从而为低阈值激光发射提供优异的光学反馈。在本文中，我们分析了不同的核心RI的OFRR激光，然后我们证明了R6 G激光时，染料在乙醇（n= 1.36），氯仿（n= 1.445），喹啉（n= 1.626）。激光阈值为25 nJ/ mm（2），比微流体激光器的先前工作低两到三个数量级。我们进一步表明，激光发射可以通过与高和低RI液核的OFRR接触的光波导有效地耦合输出，从而允许容易地引导和输送激光。(c)2007年，美国光学学会。
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 (> 10(9)), 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/ mm(2) 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. (c) 2007 Optical Society of America.