超快激光在Yb:YAG内刻写双线型光波导的研究  

Study on Writing of Double Line Waveguide in Yb···YAG with Ultrafast Laser

作　　者：唐文龙[1,2] 宋琼阁 徐庆安[3] 刘欣[1,2] 程光华[1] 

机构地区：[1]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,陕西西安710119 [2]中国科学院大学,北京100049 [3]北京控制工程研究所,北京100190

出　　处：《光学学报》2014年第12期347-352,共6页Acta Optica Sinica

基　　金：国家自然科学基金(61223007;61378019);陕西省自然科学基金(Y235I41D04)

摘　　要：研究了使用钛宝石放大器输出的重复频率为50kHz、中心波长为775nm、脉冲宽度为160fs的超快激光在掺镱钇铝石榴石(Yb…YAG)中刻写双线型光波导的过程。发现了波导具有偏振导光现象,偏振态平行于双线方向的激光可以导通,偏振态垂直于双线方向的激光不能导通。详细分析了双线间距、刻写速度和激光脉冲能量对波导形成的影响,在双线间距为30μm、刻写速度为400μm/s、脉冲能量为5.0μJ的条件下写入的光波导导光特性良好。利用近场模重建了该波导折射率二维分布,波导区域折射率相对于基质改变量的最大值为1.8×10-4,且该波导在940nm半导体激光抽运激励下,获得了1030.5nm的连续激光输出,激光功率为4.7mW。The writing of double line waveguide in Yb^3＋ doped yttrium aluminum garnet （ YU： YAG） crystal is stualea by using titanium sapphire laser with the pulse width of 160 fs, central wavelength of 775 nm and repetition frequency of 50 kHz. The phenomenon of polarization guiding is discovered in the waveguide. The laser with polarization parallel to the direction of double line can be guided, but the laser with polarization perpendicular to the direction of double line cannot be guided. The effects of written parameters, such as double line separation, laser pulse energy and writing speed, on the formation of the waveguide are analyzed. Experimental results show that the waveguide has the good property of guiding under the writing conditions of double line separation of 30 tLm, writing speed of 400 μm/s and pulse energy of 5. 0 μJ. Bivariate distribution of the waveguide refractive index is reconstructed by near-field mode and the maximum refractive index change is 1.8 × 10 4. A continuous waveguide laser with a wavelength of 1030.5 nm is obtained and the output power is 4.7 mW.

关 键 词：超快激光 集成光学 掺镱钇铝石榴石晶体 光波导 波导激光 

分 类 号：TN249[电子电信—物理电子学] TN25