棒状光子晶体光纤种子光透镜耦合分析

本文对单透镜耦合系统进行了分析。分别模拟计算了当耦合透镜F=103.26 mm时耦合效率与透镜位置的关系,以及当透镜与光纤端面的距离为120 mm时耦合效率与透镜焦距的关系。利用单透镜耦合方式对棒状光子晶体光纤进行了耦合实验,实验所用种子源是波长λ=1030 nm的SESAM锁模固体激光器(M^2≤1.2),所用棒状光子晶体光纤的芯径D=85μm(模场直径D_(MF)=65μm),测得耦合效率约为35%~42%。由于光纤中掺杂的Yb^(3+)离子对1030 nm波长的激光有一定的吸收作用,因此实际的耦合效率应该大于测定值。

High Peak Power, Single-polarized, Sub-nanoseconds Pulses Generation of a Yb-doped Rod-type Photonic Crystal Fiber Amplifier

We report a high-peak-power, single-polarized master oscillator power amplification system employing polarization- maintaining Yb-doped rod-type photonic crystal fiber. The MOPA system comprises of a Q-switched microchip laser generating ~630ps pulses at 8.6 kHz repetition-rate and two amplification stages employing double cladding fiber and rod-type PCF respectively. The MOPA system obtains narrow spectral bandwidth, single-polarized pulses of 9W maximum output average power, corresponding to peak power of 1.7MW.