Chaitanya A G N, Saini Than Singh, Kumar Ajeet, Sinha Ravindra Kumar
Appl Opt. 2016 Dec 20;55(36):10138-10145. doi: 10.1364/AO.55.010138.
In this paper, we report design and numerical analysis of a GeAsSe based chalcogenide glass graded-index photonic crystal fiber structure for mid-IR ultra broadband supercontinuum generation. The proposed dispersion engineered photonic crystal fiber offers a zero dispersion wavelength at a pump wavelength of 2.8 μm. To simulate the supercontinuum generation spectrum, the orders of dispersion coefficient up to the ninth order are considered. Simulated results indicate that an ultra broadband supercontinuum spectrum spanning 1-16 μm has been achieved using a 10 mm long photonic crystal fiber structure pumped with 50 fs secant hyperbolic pulses of 3 kW at a -30 dB spectral intensity level. To the best of our knowledge, this is the first time such broad supercontinuum spectrum has been reported. This ultra broadband mid-IR supercontinuum spectrum is applicable in many diverse fields, including medical, defense, metrology, and spectroscopy.
在本文中，我们报告了一种基于GeAsSe的硫系玻璃渐变折射率光子晶体光纤结构的设计与数值分析，用于中红外超宽带超连续谱的产生。所提出的色散工程光子晶体光纤在2.8μm的泵浦波长处提供零色散波长。为了模拟超连续谱的产生光谱，考虑了高达九阶的色散系数阶数。模拟结果表明，使用10mm长的光子晶体光纤结构，以3kW的50fs双曲正割脉冲在-30dB光谱强度水平下泵浦，已实现了覆盖1-16μm的超宽带超连续谱。据我们所知 , 这是首次报道如此宽的超连续谱。这种超宽带中红外超连续谱适用于许多不同领域，包括医疗、国防、计量学和光谱学。
