Abstract
The distinct disperion properties of higher-order modes in optical fibers permit the nonlinear generation of radiation deeper into the ultraviolet than is possible with the fundamental mode. This is exploited using adiabatic, broadband mode convertors to couple light efficiently from an input fundamental mode and also to return the generated light to an output fundamental mode over a broad spectral range. For example, we generate visible and UV supercontinuum light in the LP(02) mode of a photonic crystal fiber from sub-ns pulses with a wavelength of 532 nm.
Highlights
The nonlinear generation of new wavelengths of light in fibers is of great interest as an object of study and as a technology supporting many applications
The distinct disperion properties of higher-order modes in optical fibers permit the nonlinear generation of radiation deeper into the ultraviolet than is possible with the fundamental mode
The glass-air photonic crystal fiber (PCF) greatly boosted the field because the extraordinary control provided over chromatic dispersion permits phase matching and group-velocity matching at short wavelengths down to the visible [1,2,3,4]
Summary
The nonlinear generation of new wavelengths of light in fibers is of great interest as an object of study and as a technology supporting many applications. The most spectacular nonlinear interaction is supercontinuum generation, converting monochromatic light into a spectrally-broad output that is intense, coherent and in a single spatial mode, like a “white laser” beam [1,3,4,5,6,7,8]. Size changes along specified air holes cause input LP01 waves to evolve into output LP02 waves and vice versa Unlike those in [18], the new mode convertors couple the LP02 mode into the original unprocessed fiber core, permitting nonlinear interactions along an indefinite fiber length. In this way we generated a supercontinuum in the LP02 mode, and coupled it back into the more-useful LP01 mode over the full octave bandwidth of the supercontinuum
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