摘要
以Ge_(12)As_(24)Se_(64)(Ge-As-Se)和Ge_(10)As_(24)S_(66)(Ge-As-S)玻璃分别作为纤芯和包层材料,研制一种具有脊形芯的保偏硫系玻璃光纤,用于产生线偏振中红外超连续谱(MIR SC)。利用有限元法模拟了脊形芯光纤的群速色散特性并确定了纤芯的几何尺寸,采用挤压法结合多级棒管法制备了该光纤。制备的光纤在2.9~5.5μm波长的典型损耗约为4 dB/m,偏振消光比为19.4 dB~19.6 dB。采用中心波长为3.7μm、脉冲宽度为170 fs、重复频率为100 kHz、平均功率为40 mW的激光抽运长度为12 cm的光纤,获得了光谱范围为2~9.5μm、平均功率约为4 mW的超连续谱,偏振消光比约为19.2 dB。研究结果表明,脊形芯Ge-As-Se/Ge-As-S硫系玻璃光纤是一种有潜力产生线偏振中红外宽带超连续谱的非线性介质。
A polarization-maintaining chalcogenide glass fiber with a ridged core was designed and fabricated using Ge_(12)As_(24)Se_(64)(Ge-As-Se)glass as the core material and Ge_(10)As_(24)S_(66)(Ge-As-S)glass as the cladding material for generating linearly polarized mid-infrared supercontinuum(MIR SC).The ridged core fiber’s group velocity dispersion was simulated using the finite element method,and the ridged core’s geometrical size was determined.A multiple-stage rod-in-tube process paired with an extrusion technique was used to fabricate the fiber.The fabricated fiber exhibits a typical transmission loss of approximately 4 dB/m and a polarization extinction ratio of 19.4 dB-19.6 dB in the 2.9-5.5-μm spectral range.SC ranging from 2 to 9.5μm with an average power of approximately 4 mW was generated when the fiber with a length of 12 cm was pumped by laser with a central wavelength of 3.7μm,a pulse width of 170 fs,the repetition rate of 100 kHz,and average power of 40 mW.The SC has a measured polarization extinction ratio of 19.2 dB.These results indicate that the Ge-As-Se/Ge-As-S fiber with a ridged core is a promising nonlinear medium for generating linearly polarized broadband MIR SC.
作者
田康振
李耀程
任和
祁思胜
孟帅
张鸣杰
冯宪
杨志勇
Tian Kangzhen;Li Yaocheng;Ren He;Qi Sisheng;Meng Shuai;Zhang Mingjie;Feng Xian;Yang Zhiyong(Jiangsu Key Laboratory of Advanced Laser Materials and Devices,School of Physics and Electronic Engineering,Jiangsu Normal University,Xuzhou,Jiangsu 221116,China)
出处
《激光与光电子学进展》
CSCD
北大核心
2021年第21期33-38,共6页
Laser & Optoelectronics Progress
基金
国家自然科学基金(61805109,61575086)。
关键词
光纤光学
硫系玻璃
超连续谱
偏振消光比
fiber optics
chalcogenide glass
supercontinuum spectrum
polarization extinction ratio
