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Tunable Intracavity Coherent Up‐Conversion with Giant Nonlinearity in a Polar Fluidic Medium
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Tunable Intracavity Coherent Up‐Conversion with Giant Nonlinearity in a Polar Fluidic Medium
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Journal Article
Tunable Intracavity Coherent Up‐Conversion with Giant Nonlinearity in a Polar Fluidic Medium
2024
Overview
The study has demonstrated a novel microcavity‐based flexible photon up‐conversion system using second harmonic generation (SHG) from a polar nematic fluidic medium doped with a laser dye. The idea is based on coherent light generation via stimulated emission (lasing) and simultaneous frequency doubling inside a microcavity. The polar nematic fluid equips very high even‐order optical nonlinearity due to its polar symmetry and large dipole moment along the molecular long axis. At the same time, its inherent fluidic nature allows to easily functionalize the media just by doping, in the present case, with an emissive laser dye. The demonstrated system exhibits a giant nonlinear optical response to input light, while enabling spectral narrowing and multiple‐signal output of up‐converted light, which is not attainable through the simple SH‐conversion of input light. Furthermore, the susceptibility of the liquid crystal offers dynamic modulation capabilities by an external stimulus, such as signal switching by the application of electric field or wavelength tuning through temperature variation. Such a brand‐new type of simple coherent flexible up‐conversion system must be promising as a new principle for easily accessible and down‐scalable wavelength conversion devices. The study has developed a novel microcavity‐based coherent up‐conversion system. This system provides a multitude of advantages, such as giant nonlinearity, increased efficiency, spectrum narrowing, and the generation of coherent multimode outputs, which are usually difficult to achieve in conventional SHG. Furthermore, the outputting signal can be dynamically modulated by external stimuli.
Publisher
John Wiley & Sons, Inc,John Wiley and Sons Inc,Wiley
