射频激励增益波导CO2激光器的光强分布

提出了一种新的射频(RF)激励增益波导阵列CO2激光器技术。为了提高输出激光光束质量,增强多个波导通道之间模式的耦合,通过在上电极刻上等距离的凹槽,形成一个个并列的子电极,使增益在电极横向具有周期分布特征。同时使用表面刻有周期性凹槽的相移全反射镜,实现了远场光束的极强相干叠加。研究了其近场和远场的光强分布情况。在气压为10.0 kPa,10.7 kPa的情况下,近场为长20 mm的若干个尖峰分布,远场为中心压窄的极锐尖峰。随着时间变化,只有光强峰值变化,相对强度分布保持不变。

Radio Frequency Excited Gain Waveguide Array CO2 Laser with Compressed Single Peak Intensity Distribution

A new kind of a radio frequency(RF) excited diffusively cooled gain slab waveguide CO_2 laser was presented.In this type of laser,to improve the quality of output laser beam and enhance the mode coupling between multi-waveguide sub-channels,grooves were made on the top electrode to form a list of parallel sub-electrodes,which can produce the periodically gain distribution along the transverse direction of waveguide.A phase-shifted totally reflecting copper mirror with periodically grooves on the surface was employed and the interference superposition of far-field sub-laser-beams was obtained.The near-field and spatially compressed single peak far-field intensity distributions of output laser beam were studied at pressures of 10.0 kPa and 10.7 kPa,respectively.