Woodward R I, Kelleher E J R, Popov S V, Taylor J R
Opt Lett. 2014 Apr 15;39(8):2330-3. doi: 10.1364/OL.39.002330.
We characterize stimulated Brillouin scattering (SBS) of visible light in small-core photonic crystal fiber (PCF). Threshold powers under 532 nm excitation agree with established theory, in contrast to measured values up to five times greater than expected for Brillouin scattering of 1550 nm light. An isolated, single-peaked signal at a Stokes shift of 33.5 GHz is observed, distinct from the multi-peaked Stokes spectra expected when small-core PCF is pumped in the infrared. This wavelength-dependence of the Brillouin threshold, and the corresponding spectrum, are explained by the acousto-optic interactions in the fiber, governed by dimensionless length scales that relate the modal area to the core size, and the pump wavelength to PCF hole pitch. Our results suggest new opportunities for exploiting SBS of visible light in small-core PCFs.
我们对小芯光子晶体光纤（PCF）中可见光的受激布里渊散射（SBS）进行了表征。532nm激发下的阈值功率与既定理论相符，这与1550nm光的布里渊散射测量值相比，高达预期值的五倍。观察到在斯托克斯频移为33.5GHz处有一个孤立的单峰信号，这与小芯PCF在红外波段泵浦时预期的多峰斯托克斯光谱不同。布里渊阈值的这种波长依赖性以及相应的光谱，是由光纤中的声光相互作用所解释的，这些相互作用由无量纲长度尺度决定，这些尺度将模式面积与纤芯尺寸、泵浦波长与PCF孔间距联系起来。我们的结果为在小芯PCF中利用可见光的SBS提供了新的机会。
