Trabold Barbara M, Novoa David, Abdolvand Amir, Russell Philip St J
Opt Lett. 2014 Jul 1;39(13):3736-9. doi: 10.1364/OL.39.003736.
Prism-coupling through the microstructured cladding is used to selectively excite individual higher order modes in hollow-core photonic crystal fibers (PCFs). Mode selection is achieved by varying the angle between the incoming beam and the fiber axis, in order to match the axial wavevector component to that of the desired mode. The technique allows accurate measurement of the effective indices and transmission losses of modes of arbitrary order, even those with highly complex transverse field distributions that would be extremely difficult to excite by conventional endfire coupling.
通过微结构包层的棱镜耦合用于选择性地激发空心光子晶体光纤（PCF）中的各个高阶模式。通过改变入射光束与光纤轴之间的角度来实现模式选择，以便使轴向波矢分量与所需模式的轴向波矢分量相匹配。该技术允许精确测量任意阶模式的有效折射率和传输损耗，即使是那些具有高度复杂横向场分布的模式，而这些模式通过传统的端射耦合极难激发。
