研究目的
Investigating mid-IR SC generation in a cascaded silica-ZBLAN-chalcogenide fiber system directly pumped with a commercially available pulsed fiber laser operating at 1.55 μm.
研究成果
The study successfully demonstrated a broadband fiber-based supercontinuum source spanning from 2 to 10 μm with 16 mW output power using cascaded ZBLAN-chalcogenide optical fibers directly pumped by a compact 1550-nm pulsed fiber laser. Numerical simulations matched the experimental results closely, providing insights into the spectral broadening mechanisms. Recommendations for optimization include using a shorter ZBLAN fiber and a chalcogenide microstructured fiber with a smaller core diameter, exploring all-fiber filtering systems, and investigating telluride-glass fibers for further spectral broadening.
研究不足
The study is limited by the transmission window of the fibers used, particularly the chalcogenide fiber's transmission window ending near 10 μm. The system also experiences significant losses due to free-space optics and coupling inefficiencies.
1：Experimental Design and Method Selection:
The study uses a cascaded silica-ZBLAN-chalcogenide fiber system pumped by a pulsed fiber laser. The methodology includes nonlinear pulse propagation simulation using the generalized nonlinear Schr?dinger equation (GNLSE) with an adaptive step size method.
2：Sample Selection and Data Sources:
The system consists of three commercially available optical fibers: a 20 cm-long single-mode silica fiber (SMF-28), a 25 m-long ZBLAN fiber, and a 9 m-long chalcogenide-glass photonic crystal fiber.
3：List of Experimental Equipment and Materials:
A compact pulsed fiber laser (90 × 70 × 15 mm3) providing 460 ps-width pulse train at 100 kHz repetition rate and at a center wavelength of 1550.6 nm, high numerical aperture aspheric lenses, a mid-IR long pass filter (LPF), and a mid-IR optical spectrometer including a monochromator (ORIEL 7240) and a highly sensitive Hg-Cd-Te detector.
4：6 nm, high numerical aperture aspheric lenses, a mid-IR long pass filter (LPF), and a mid-IR optical spectrometer including a monochromator (ORIEL 7240) and a highly sensitive Hg-Cd-Te detector.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Light coupling between each fiber was achieved using high-numerical aperture aspheric lenses. A mid-IR long pass filter (LPF) was placed between the ZBLAN and the chalcogenide fibers to reject wavelengths below 1.9 μm. The generated SC spectra were recorded using the mid-IR optical spectrometer.
5：9 μm. The generated SC spectra were recorded using the mid-IR optical spectrometer.
Data Analysis Methods:
5. Data Analysis Methods: The nonlinear pulse propagation was simulated using the GNLSE and solved numerically with the split-step Fourier method (SSFM) combined with an adaptive step size.
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