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- Title
Design of ultra-broadband and highly coherent MIR supercontinuum generation using a photonic crystal fiber.
- Authors
Khamis, M. A.; Al-Abbasi, Ziad Qais
- Abstract
This study proposed a new PCF design to extend the SC generation beyond the long wavelength edge of the MIR molecular fingerprint region. The proposed design was made of AsSe2 glass as a background material whose has a significant nonlinear refractive index at 11 × 10−18 m2 W−1. The proposed PCF design was consist of five layers of circular air holes arranged in a triangular lattice of pitch size (Λ = 2 µm). The air hole diameters of the first layer were different in size with other layers to give more flexibility in the control of the chromatic dispersion. The geometrical parameters of the PCF design are modified to achieve the anomalous dispersion regime. We applied the Finite Difference Method to compute the linear and nonlinear parameters of the proposed PCF structure including dispersion, loss, effective mode area and the Kerr nonlinearity. The Nonlinear Schrödinger Equation is numerically solved by using Split-Step Fourier method to evaluate MIR SC generation. The simulated results showed that by using only 4 cm of the suggested PCF design pumped with 3 kW peak power and 330 fs pulses at 8 μm wavelength in the anomalous dispersion regime is enough to generate coherent MIR SC covering from 5 to 21 μm. This is to the authors' knowledge longer MIR SC wavelength can be generated from PCF design under abnormal dispersion profile.
- Subjects
SUPERCONTINUUM generation; PHOTONIC crystal fibers; OPTICAL dispersion; NONLINEAR Schrodinger equation; FINITE difference method; DNA fingerprinting; SEPARATION of variables
- Publication
Optical & Quantum Electronics, 2024, Vol 56, Issue 5, p1
- ISSN
0306-8919
- Publication type
Article
- DOI
10.1007/s11082-024-06390-y