Light conversion in waveguides
The non-linear conversion of laser light in waveguides is accomplished, e.g., by four-wave mixing (FWM). In FWM, the light is altered in its spectral or spatial distribution by non-linear interaction with the medium. By this interaction, very broadband light distributions from the ultraviolet to the mid-infrared spectral region - so-called supercontinua - can be generated in single-mode waveguides by conversion of longitudinal modes. In multimode waveguides, however, a change in the spatial light distribution can be achieved by a conversion of transversal modes.
The transversal mode conversion is investigated in the Working Group of Optical Technologies related to its potential as a novel optical switching mechanism for future telecommunication techniques. Supercontinuum sources are used as the basis for widely tunable light sources for chemically-selective microscopy.
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