Mid-infrared supercontinuum generation in a suspended-core As2S3 chalcogenide microstructured optical fiber

Area of Science:

• Materials Science
• Optical Engineering
• Nonlinear Optics

Background:

• Supercontinuum (SC) generation is crucial for various spectroscopic applications.
• Chalcogenide microstructured optical fibers (MOFs) offer unique nonlinear properties for light manipulation.
• Understanding SC generation dynamics in these fibers is essential for optimizing performance.

Purpose of the Study:

• To demonstrate and investigate supercontinuum (SC) generation in a suspended-core As(2)S(3) chalcogenide MOF.
• To analyze the influence of fiber length, pump peak power, and pump wavelength on SC characteristics.
• To validate experimental findings through numerical simulations.

Main Methods:

• Experimental generation of SC in suspended-core As(2)S(3) MOF with varying fiber lengths (1.3-40 cm).
• Systematic variation of pump peak power (0.24-1.32 kW) and pump wavelength (2200-2600 nm).
• Numerical simulation of SC generation using the generalized nonlinear Schrödinger equation.

Main Results:

• Continuous SC generation extending beyond 4 μm was achieved with shorter fibers (1.3 and 2.4 cm).
• Longer fibers (20 and 40 cm) exhibited discontinuous SC ranges due to material absorption.
• SC broadening correlated with increased pump peak power and pump wavelength shifts.
• Experimental results showed good agreement with numerical simulations.

Conclusions:

• Suspended-core As(2)S(3) MOFs are effective for broadband SC generation.
• Fiber length is a critical parameter determining SC continuity and spectral range.
• Optimizing pump parameters and fiber design can tailor SC properties for specific applications.