An efficient broad-band mid-wave IR fiber optic light source: design and performance simulation.

Area of Science:

• Optics and Photonics
• Materials Science
• Nonlinear Optics

Background:

• Mid-wave infrared (MWIR) light sources are crucial for various applications.
• Generating broadband light in the MWIR often faces limitations in efficiency and spectral range.
• Degenerate four-wave mixing (D-FWM) is a promising nonlinear optical process for light generation.

Purpose of the Study:

• To design and demonstrate a novel fiber-based light source for the MWIR spectrum.
• To exploit degenerate four-wave mixing (D-FWM) in a highly nonlinear chalcogenide microstructured optical fiber (MOF).
• To achieve a broad bandwidth (BW) light source by precisely tailoring the fiber's dispersion profile.

Main Methods:

• Utilizing a meter-long, highly nonlinear chalcogenide MOF with a tailored dispersion profile.
• Employing an Erbium (Er3+)-doped ZBLAN fiber laser emitting at 2.8 μm as the pump source (5 W average power).
• Investigating the D-FWM process to generate broadband emission in the MWIR region.

Main Results:

• Achieved a superior D-FWM bandwidth (BW) through precise tailoring of the fiber's dispersion profile.
• Realized positive quartic dispersion at the pump wavelength, enhancing the FWM process.
• Obtained an amplification factor as high as 25 dB in the 3 - 3.9 μm spectral range.
• Demonstrated an average power conversion efficiency exceeding 32%.

Conclusions:

• The designed fiber-based light source effectively utilizes D-FWM in chalcogenide MOFs for broadband MWIR generation.
• Precise control over the fiber's dispersion profile is key to achieving broad bandwidths and high efficiencies.
• This technology offers a promising solution for efficient and powerful MWIR light generation.