飞秒激光在掺Nd^(3+)光热敏折变玻璃中写入光波导  

Nd^(3+):Photo-thermo-refractive Glass Waveguides Written by Femtosecond Laser

作　　者：张泽宇 安海涛 王旭[2] 谢英武 张华 刘青[3] 陈立功 杨波 ZHANG Ze-yu;AN Hai-tao;WANG Xu;XIE Ying-wu;ZHANG Hua;LIU Qing;CHEN Li-gong;YANG Bo(Xi'an Institute of Modern Control Technology,Xi'an710065,China;State Key Laboratory of Transient Optics and Photonics,Xi'an Institute of Optics and Precision Mechanics,Chinese Academy of Sciences,Xi'an710119,China;Zhejiang Wanli University,Ningbo,Zhejiang 315100,China)

机构地区：[1]西安现代控制技术研究所,西安710065 [2]中国科学院西安光学精密机械研究所瞬态光学与光子技术国家重点实验室,西安710119 [3]浙江万里学院,浙江宁波315100

出　　处：《光子学报》2019年第3期9-16,共8页Acta Photonica Sinica

基　　金：国家自然科学基金(No.61775236);浙江省自然科学基金(No.LY14F050002)~~

摘　　要：利用中心波长1 028nm、重复频率50kHz、脉冲宽度220fs的超短脉冲激光在掺Nd^(3+)光热敏折变玻璃中刻写双线型和压低包层管状波导.研究了激光功率、波导双线间距、管状波导直径对近场模式的影响,得到了两组导光模式较优的波导.利用波导的近场模式强度分布重构了其折射率分布图,得到两类波导最大的折射率增加量分别为+7.0×10^(-4)和+5.5×10^(-4).利用散射法测得双线型波导的传输损耗为1.29dB/cm;通过测量插入损耗得到压低包层管状波导的传输损耗小于1.95dB/cm.利用飞秒激光在掺Nd^(3+)光热敏折变玻璃中直接写入光波导,在集成光学器件上具有广阔的应用前景.ZHANGZe-yu[1];AN Hai-tao[1];WANGXu[2];XIEYing-wu[1];ZHANG Hua[1];LIU Qing[3];CHENLi-gong[1];YANGBo[1]Femtosecond laser with central wavelength of 1028 nm, repetition rate of 50 kHz and pulse width of 220 fs is used to write double line and tubular depressed cladding waveguides in Nd^3+ doped photo-thermo-refractive glass. The influences of laser power, double line separation and diameters of tubular depressed cladding waveguide on the near-field modes of waveguides are investigated, and the waveguides with better guiding mode are obtained. Refractive index profile is reconstructed by intensity distribution of the near-field mode, the largest positive refractive index change for these two types of waveguides is +7.0×10^-4 and +5.5×10^-4 , respectively. By using the scattering technique, the propagation loss of double line waveguide is about 1.29 dB/cm. The loss of tubular depressed cladding waveguide is less than 1.95 dB/cm by testing the insert loss. Therefore, waveguides inscribed directly by femtosecond laser in Nd^3+ doped photo-thermo-refractive glass are promising candidates for the development of integrated optical device.

关 键 词：集成光学 双线型波导 压低包层管状波导 飞秒激光光刻 掺Nd^3+光热敏折变玻璃 

分 类 号：TN249[电子电信—物理电子学]