Analysis of optical damage mechanisms in hollow-core waveguides delivering nanosecond pulses from a Q-switched Nd:YAG laser.
Analysis of optical damage mechanisms in hollow-core waveguides delivering nanosecond pulses from a Q-switched Nd:YAG laser.
复制标题
分析从 Q 开关 Nd:YAG 激光器传输纳秒脉冲的空心波导中的光学损伤机制。
DOI：
10.1364/ao.45.009160
复制
发表时间：
2006
期刊：
影响因子：
1.9
通讯作者：
D. Hand
中科院分区：
文献类型：
--
作者：
J. Parry;T. Stephens;J. Shephard;J. Jones;D. Hand
空心芯波导由内部有反射涂层的玻璃毛细管组成，与类似芯直径的阶跃折射率光纤相比，能够提供数十毫焦耳的脉冲能量，具有更好的聚焦性。我们展示了这些光纤在Nd:YAG激光的基频（1064 nm）、二频（532 nm）和三频（3555 nm）处提供高功率调q脉冲的能力，无论是在峰值功率还是光束质量方面。在峰值功率传输方面，主要限制是对反射涂层发生弯曲引起的光学损伤。分析了损伤机理和影响因素，重点分析了损伤与导模数、芯径、涂层厚度和输入偏振方向的关系。
Hollow-core waveguides consisting of a glass capillary tube with an internal reflective coating are capable of delivering pulse energies of tens of millijoules with improved focusability compared to step index fibers of similar core diameter. We demonstrate the capability of these fibers to deliver high-power Q-switched pulses at the fundamental (1064 nm), second (532 nm), and third (355 nm) harmonics of a Nd:YAG laser, both in terms of peak power and beam quality delivered. In terms of peak power delivery, the primary limitation is the occurrence of bend-induced optical damage to the reflective coating. The damage mechanism and the influential factors are analyzed, in particular, the dependence upon the number of guided modes, core diameter, coating thicknesses, and input polarization alignment.