用于产生中红外超连续谱的硫系玻璃色散研究

硫系材料由于具有较长波长的红外透光截止波段,且具有较高的线性折射率和高非线性系数,是产生中红外超连续谱激光的理想非线性介质材料。由于泵浦非线性介质一般多采用波长2 m以下的激光源,所以研究材料的色散很有意义。利用4种不同形式的方程拟合了3种硫系玻璃材料As2S3、As2Se3、Ge33As12Se55的折射率随波长的变化曲线,并计算了材料色散曲线,得到了较为理想的结果,3种材料的零色散波长分别为4.8 m、7.2 m、6.1 m。同时证明了对于硫系玻璃材料,不能只利用短波长下的折射率值拟合计算长波长下的折射率。

Dispersion study of chalcogenide glass for mid-IR supercontinuum generation

Due to a high transmission in the infrared range as well as the high linear refractive index and nonlinearity, chalcogenide glass was a good candidate for mid-infrared supercontinuum generation. Since the wavelengths of pump sources for pumping nonlinear mediums are usually less than 2 m, it is valuable to study their material dispersion. Used four different forms of equation to fit the refractive index versus wavelength curves, three different kinds of chalcogenide glass was simulated:As2S3, As2Se3 and Ge33As12Se55, also we got their material dispersion curves by the former simulation results. Their zero-dispersion wavelengths are 4.8 m, 7.2 m, 6.1 m, respectively. While proved that it is not suitable to use refractive index data at short wavelength to fit and simulate the trend at long wavelength for chalcogenide glass.