基于SESAM镜的全光纤皮秒激光器腔内脉冲传输特性研究  

Research on the Transmission Characteristics of the Pulse in the Cavity of All-fiber Picosecond Lasers Based on SESAM

作　　者：张小菲[1] 黄楚云[1] 李根[1] 

机构地区：[1]湖北工业大学理学院,武汉430070

出　　处：《激光杂志》2015年第8期24-27,共4页Laser Journal

摘　　要：全光纤皮秒激光器由于其结构简单、稳定性高、成本低等优点被广泛应用于通信、工业加工等领域。本论文针对一种基于半导体可饱和吸收镜(SESAM镜)和均匀光纤布拉格光栅(FBG)结构,在选定的AMP FC-SC单模光纤中(有效折射率neff=1.47,色散系数β2=2.5×10-26s2/m,非线性系数γ=0.005(W×m)-1)通过非线性薛定谔方程,传输矩阵等方法,数值研究了SESAM镜,FBG的参数对腔内脉冲传输的影响。在光栅中心波长λFBG=1064 nm,光纤长度L=10 m,纤芯直径9μm的条件下,数值结果得到在SESAM调制深度△R≥0.38,FBG耦合系数k≤0.63,长度范围为4.9 nm≤LFBG≤7.9 nm和8.1 nm≤LFBG≤11.1 nm时能够得到脉宽约为100 ps高斯分布的腔内传输脉冲。Due to the simple structure,high stability and low cost,the all-fiber picosecond laser is widely used in communications,industrial processes and other fields. In this thesis,a semiconductor Saturable mirror( SESAM) and a uniform Fiber Bragg grating( FBG) are used. In AMP FC-SC single-mode fiber( with effective index neff= 1. 47,dispersion constant coefficient β2= 2. 5 ×10-26s2/ m,nonlinear coefficient γ = 0. 005( W×m)-1) the influence of SESAM mirror and FBG on cavity pulse is studied by nonlinear Schrodinger equation,transmission matrix methods. Under the condition of center wavelength λFBG= 1064 nm,fiber length L = 10 m and core diameter is 9 μm,the numerical results show that when the modulation depth △R≥0. 38,the gating coupling coefficient k≤0. 63,the length of FBG 4. 9 nm≤LFBG≤7. 9 nm and 8. 1 nm≤LFBG≤11. 1 nm,there will be a 100 ps Gaussian pulse in transmitting the cavity.

关 键 词：皮秒激光器 SESAM镜 FBG 脉宽 

分 类 号：TN248[电子电信—物理电子学]