Fu Ling, Gu Min
Centre for Micro-Photonics, Faculty of Engineering and Industrial Sciences, Swinburne University of Technology, Hawthorn, Victoria, Australia.
Opt Lett. 2006 May 15;31(10):1471-3. doi: 10.1364/ol.31.001471.
A 1 x 2 double-clad photonic crystal fiber coupler is fabricated by the fused tapered method, showing a low excess loss of 1.1 dB and a splitting ratio of 97/3 over the entire visible and near-infrared wavelength range. In addition to the property of splitting the laser power, the double-clad feature of the coupler facilitates the separation of a near-infrared single-mode beam from a visible multimode beam, which is ideal for nonlinear optical microscopy imaging. In conjunction with a gradient-index lens, this coupler is used to construct a miniaturized microscope based on two-photon fluorescence and second-harmonic generation. Three-dimensional nonlinear optical images demonstrate potential applications of the coupler to compact all-fiber and nonlinear optical microscopy and endoscopy.
采用熔锥法制备了一种1×2双包层光子晶体光纤耦合器，在整个可见光和近红外波长范围内，其附加损耗低至1.1 dB，分光比为97/3。除了具有分光特性外，该耦合器的双包层特性有助于将近红外单模光束与可见多模光束分离，这对于非线性光学显微镜成像来说是理想的。结合梯度折射率透镜，该耦合器用于构建基于双光子荧光和二次谐波产生的小型显微镜。三维非线性光学图像展示了该耦合器在紧凑型全光纤非线性光学显微镜和内窥镜方面的潜在应用。
