Experimental studies on the structural dependence of stimulated Raman-like scattering in solid-core photonic crystal fibers

Area of Science:

• Optics and Photonics
• Materials Science

Background:

• Photonic crystal fibers (PCFs) confine optical and acoustic fields, enhancing stimulated Raman-like scattering (SRLS).
• SRLS gain spectra in PCFs are generally core-size dependent, but the role of air channels is less understood.

Purpose of the Study:

• To systematically investigate the impact of PCF air channels on SRLS gain spectra.
• To provide design guidance for PCFs used in applications involving SRLS.

Main Methods:

• Investigated multiple PCF samples with varied core diameters and air-filling ratios.
• Analyzed the effects on gain strength, frequency shift, and multi-peak structures.

Main Results:

• Demonstrated that PCF air channels significantly impact SRLS gain strength, frequency shift, and spectral structure.
• Identified specific mechanisms through physical interpretations.

Conclusions:

• PCF air channel design is crucial for tailoring SRLS properties.
• Findings offer practical guidance for optimizing PCFs in mode-locked lasers and opto-acoustic isolators.