轴向张力作用下As_(2)S_(3)硫系光纤的光敏性及其在Bragg光栅刻写方面的应用  

Photosensitivity of As_(2)S_(3) Chalcogenide Fiber with Axial Tension and Its Application in Writing Bragg Gratings

作　　者：邹林儿 尚磊 杨熙飞 沈云[1] Zou Liner;Shang Lei;Yang Xifei;Shen Yun(School of Physics and Materials Science,Nanchang University,Nanchang 330031,Jiangxi,China)

机构地区：[1]南昌大学物理与材料学院,江西南昌330031

出　　处：《中国激光》2023年第14期178-184,共7页Chinese Journal of Lasers

基　　金：国家自然科学基金(62165008,61465008);江西省自然科学基金(20212ACB201007)。

摘　　要：为进一步提高硫系光纤的光敏性,基于光纤法布里-珀罗标准具原理研究了As_(2)S_(3)硫系光纤在轴向张力作用下的光敏性,结果表明施加轴向张力能显著提高其光敏性。与未施加轴向压力相比,在第一快过程中,光致折射率负变化幅度减小,经历的时间可缩短至数十秒;在第二慢过程中,光致折射率变化Δn加快朝正方向恢复,在一定张力作用下光致折射率变化Δn出现正增长,Δn增长幅度可达到5.41×10^(-3)。基于这一显著光敏性刻写了As_(2)S_(3)硫系光纤Bragg光栅,在70~110 s的短曝光时间内,光栅透射深度平均值达到了9.46 dB,且光栅光谱质量良好。本研究为制备高反射率硫系光纤光栅提供了新思路和新途径。Objective Among the many photonic devices,the Bragg grating of chalcogenide glass fibers is important.As a linear device,it can be applied to infrared sensors.In nonlinear optical applications,it can achieve all-optical signal processing.In addition,it is necessary to apply Bragg grating with high reflectivity to obtain efficient integrated chalcogenide glass fiber lasers,such as the distributed feedback Brillouin lasers.For chalcogenide glass fibers,it is complex to write Bragg gratings,mainly because the cladding and core components of chalcogenide glass fibers are similar;thus,both show photosensitivity,resulting in the weak photosensitivity of the fiber core.In our previous study,near-bandgap light close to the absorption edge of the material was selected to irradiate the chalcogenide glass fiber.The fiber core showed high photosensitivity,which solved the weak photosensitivity caused by sub-bandgap light far from the absorption edge of the material.However,when the fiber is used to write a Bragg grating,the depth of the grating transmission peak is not extended and cannot satisfy the actual usage requirements.This requires methods to further improve the photosensitivity of chalcogenide fibers.Therefore,this study extensively investigated the photosensitivity of chalcogenide optical fibers in tension applied in the axial direction to improve the photosensitivity of chalcogenide fibers and provide a new approach to writing gratings with high reflectivity.The findings provide new ideas and approaches for preparing chalcogenide grating photonic devices and will promote the development of chalcogenide photonics.Methods The photosensitivity of chalcogenide optical fibers was determined by measuring the change in the refractive index of the fiber core based on the Fabry-Perot(FP) etalon principle.In this experimental device,an optical fiber clamp with a slider was designed to apply tension,and a continuous dual-frequency Nd∶YAG laser with a working wavelength of 532 nm was used as the illumination source.After th

关 键 词：光纤光学 硫系玻璃光纤 张力 光敏性 光纤光栅 

分 类 号：TN253[电子电信—物理电子学]