Employment of anisotropic nonlinear optical waveguides, for example in combination with AFB® crystalline fiber waveguides (CFW), provides access to the design of a number of novel high power and high efficiency light sources spanning the range of wavelengths from deep ultraviolet (as short as ~200 nm) to mid-infrared (as long as about 18 μm). To our knowledge, the technique is the only generally applicable one because most often there are no compatible cladding crystals available to nonlinear optical cores, especially not with an engineer-able refractive index difference and large mode area.
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Da Li, Pengda Hong, Helmuth E. Meissner, "Waveguide structures in anisotropic nonlinear crystals," Proc. SPIE 10100, Optical Components and Materials XIV, 101000V (16 February 2017);