射频激励增益波导CO_2激光器的光强分布

Radio Frequency Excited Gain Waveguide Array CO_2 Laser with Compressed Single Peak Intensity Distribution

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。

A new kind of a radio frequency （RF） excited diffusively cooled gain slab waveguide CO2 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.