All normal dispersion supercontinuum generation in a liquid-core fiber under noninstantaneous nonlinearity

Area of Science:

• Nonlinear optics
• Optofluidics
• Fiber optics

Background:

• Liquid-core fibers offer unique nonlinear optical properties.
• Nonlinearities in liquids include instantaneous and non-instantaneous effects.
• The impact of non-instantaneous nonlinearity in normal dispersion regimes is understudied.

Purpose of the Study:

• To numerically simulate pulse evolution in liquid-core fibers with normal dispersion and high non-instantaneous nonlinearity.
• To investigate the effects of non-instantaneous nonlinearity on self-phase modulation and supercontinuum generation.
• To explore the influence of non-instantaneous nonlinearity on spectral properties and coherence.

Main Methods:

• Numerical simulation of pulse propagation.
• Modeling of liquid-core fiber dynamics.
• Analysis of spectral broadening and coherence properties.

Main Results:

• Non-instantaneous nonlinearity causes narrow bandwidth and asymmetric self-phase modulation spectra.
• Enhanced simulated Raman scattering (SRS) observed even at low input power.
• Octave-spanning supercontinuum generation achieved, but coherence is significantly reduced by SRS.
• Non-instantaneous nonlinearity impacts pulse broadening in normal dispersion.

Conclusions:

• Non-instantaneous nonlinearity plays a crucial role in pulse evolution within liquid-core fibers under normal dispersion.
• Understanding these effects is vital for optimizing supercontinuum generation and developing optofluidic devices.
• Results provide insights into light-liquid interactions for lasers and sensors.