Cross-phase-modulation-induced spectral effects in high-efficiency picosecond fiber optical parametric oscillators

Area of Science:

• Nonlinear optics
• Fiber optics
• Quantum optics

Background:

• Fiber optical parametric oscillators (FOPOs) are crucial for generating tunable light sources.
• Understanding spectral dynamics in FOPOs is essential for optimizing their performance.
• Cross-phase modulation and walk-off are key nonlinear effects influencing spectral output.

Purpose of the Study:

• To investigate the spectral effects of cross-phase modulation and walk-off in picosecond FOPOs.
• To analyze pump-power-dependent spectral broadening and asymmetry.
• To explore methods for controlling spectral output and enhancing conversion efficiency.

Main Methods:

• Experimental setup utilizing picosecond fiber optical parametric oscillators.
• Analysis of output spectra under varying pump power and synchronization conditions.
• Cavity length tuning to influence spectral characteristics.

Main Results:

• Observed pump-power-dependent spectral broadening in the output.
• Demonstrated asymmetric spectra with redshift or blueshift based on pump synchronization.
• Achieved a blueshifted spectrum with a conversion efficiency up to 15% by adjusting cavity length.

Conclusions:

• Cross-phase modulation and walk-off significantly impact picosecond FOPO spectra.
• Spectral output can be controlled via pump synchronization and cavity length.
• Optimized cavity length provides a pathway to efficient, blueshifted spectral generation.