Tunable Intracavity Coherent Up-Conversion with Giant Nonlinearity in a Polar Fluidic Medium

Area of Science:

• Photonics and Nonlinear Optics
• Materials Science
• Liquid Crystal Technology

Background:

• Photon up-conversion is crucial for various optical applications, but efficient and flexible systems remain challenging.
• Second harmonic generation (SHG) typically requires specific material symmetries and configurations.
• Existing methods often lack tunability and dynamic modulation capabilities.

Purpose of the Study:

• To demonstrate a novel microcavity-based flexible photon up-conversion system.
• To leverage the unique properties of polar nematic fluids for enhanced nonlinear optical responses.
• To explore dynamic modulation of up-converted light through external stimuli.

Main Methods:

• Utilizing a microcavity structure for coherent light generation (lasing) and frequency doubling.
• Employing a polar nematic fluidic medium doped with a laser dye for second harmonic generation (SHG).
• Investigating the nonlinear optical properties and dynamic modulation capabilities of the system.

Main Results:

• Achieved a novel microcavity-based flexible photon up-conversion system.
• Demonstrated a giant nonlinear optical response from the doped polar nematic fluid.
• Observed spectral narrowing and multiple-signal output of up-converted light.
• Showcased dynamic modulation via electric fields and temperature variations.

Conclusions:

• The developed system offers a new principle for accessible and down-scalable wavelength conversion.
• Polar nematic fluids provide a highly nonlinear optical medium suitable for up-conversion.
• The flexible and tunable nature of the system opens possibilities for advanced optical devices.