摘要
通过对基于轴棱锥的贝塞尔谐振腔和贝塞尔-高斯谐振腔的研究,设计了一台腔内倍频Nd:YAG纳秒近似无衍射贝塞尔绿光激光器.非稳激光器谐振腔由轴棱锥和凸面镜组成.实验采用单灯脉冲抽运激光增益介质Nd:YAG晶体,倍频晶体选用KTP.当抽运电压为350V时,由主动式直接产生纳秒近似零阶贝塞尔绿光,其脉冲宽度为55.1ns,波长为532nm,线宽为0.8nm,近似无衍射零阶贝塞尔绿光的中心光斑直径为192μm.利用Fresnel-Kirchhoff衍射积分和Fox-Li迭代法,通过数值计算得出了谐振腔的稳定场分布.实验结果与理论模拟基本符合.
An intracavity frequency-doubled Nd∶ YAG nanosecond Bessel green laser is designed in an axicon-based Bessel and Bessel-Gaussian resonator. The unstable laser resonator is composed of a refraction axicon and a convex mirror. The gain medium Nd∶ YAG rod is pumped by a single flash-lamp which is working in a pulsed mode and a KTP crystal is used for intracavity second-harmonic generation. Nanosecond Bessel green beam is generated directly from the laser by active method when pumping voltage is 350 V. The pulse with width of 55. 1 ns,central wavelength at 532 nm,spectral line width of 0. 8 nm and diameter of central spot of 192 μm is obtained. Fresnel-Kirchhoff diffraction integral and the Fox-Li algorithm is used to extract the dominant mode of the cavity and the experimental results are consistent with those of the numerical simulation.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2010年第9期6213-6218,共6页
Acta Physica Sinica
基金
国家自然科学基金(批准号:60977068)
泉州市科技重点项目(批准号:2009G4)资助的课题~~
关键词
主动式
纳秒贝塞尔光束
腔内倍频
轴棱锥
active method
nanosecond Bessel beam
intracavity frequency-doubling
axicon
