Dramatic Raman Gain Suppression in the Vicinity of the Zero Dispersion Point in a Gas-Filled Hollow-Core Photonic Crystal Fiber.
Dramatic Raman Gain Suppression in the Vicinity of the Zero Dispersion Point in a Gas-Filled Hollow-Core Photonic Crystal Fiber.
复制标题
充气空心光子晶体光纤中零色散点附近的显着拉曼增益抑制。
DOI：
10.1103/physrevlett.115.243901
复制
发表时间：
2015
影响因子：
8.6
通讯作者：
P. S. Russell
中科院分区：
文献类型：
--
作者：
Sebastian T. Bauerschmidt;D. Novoa;P. S. Russell
1964年，Bloembergen和Shen预测，如果声子产生和湮灭（通过非弹性散射）的速率精确平衡，拉曼增益可以被抑制。只有当每个过程所需的动量相同时，这才是可能的，即，由泵浦-斯托克斯散射产生的声子相干波与在泵浦-反斯托克斯散射中湮灭的声子相干波相同。在大体积气体电池中，这只能在与泵轴成斜角的有限相互作用长度上实现。在这里，我们报告了一个简单的系统，提供了戏剧性的拉曼增益抑制在长共线路径长度的氢。它由一个充气的空芯光子晶体光纤，其零色散点的压力调整到接近泵浦激光波长。在一定的精确压力下，基模中斯托克斯光的受激产生被完全抑制，从而允许在高泵浦功率下探索诸如自发拉曼散射的其他弱得多的现象。
In 1964 Bloembergen and Shen predicted that Raman gain could be suppressed if the rates of phonon creation and annihilation (by inelastic scattering) exactly balance. This is only possible if the momentum required for each process is identical, i.e., phonon coherence waves created by pump-to-Stokes scattering are identical to those annihilated in pump-to-anti-Stokes scattering. In bulk gas cells, this can only be achieved over limited interaction lengths at an oblique angle to the pump axis. Here we report a simple system that provides dramatic Raman gain suppression over long collinear path lengths in hydrogen. It consists of a gas-filled hollow-core photonic crystal fiber whose zero dispersion point is pressure adjusted to lie close to the pump laser wavelength. At a certain precise pressure, stimulated generation of Stokes light in the fundamental mode is completely suppressed, allowing other much weaker phenomena such as spontaneous Raman scattering to be explored at high pump powers.