摘要
多通道表面放电在光泵浦XeF(C-A)激光时具有能量沉积效率高、可获得大面积均匀放电、激活体积大以及增益均匀等优点。本文通过研制一单模块多通道放电装置，对其泵浦源特性进行了研究。
介绍了多通道表面放电泵浦源的设计，并对相关的触发机理进行了理论分析。建立了参数的诊断及测量系统，用两种方法实验研究了泵浦源的同步及均匀放电，实现了多通道的同步，抖动小于40ns；研究了各种因素对同步的影响，得到了泵浦源多通道同步及均匀放电适当的实验条件：氮氩混合气体总气压约1～1.5atm，气分比为N_2：Ar=3：7，充电电压大于15kV，触发电压大于30kV，前沿约10ns。实验研究了不同条件下泵浦源电路参数的变化规律。对XeF_2的光解离以及解离波和XeF(C-A)激光的形成机理进行了简要描述，实验拍摄了通道不同单位长度沉积功率情况下的解离波图像，计算了解离波发展速度及等离子体亮度温度，对其真空紫外辐射能力做出了评估。
The multichannel surface discharge applied for optical pumping XeF(C-A) laser has the advantages of high energy deposited efficiency , capability for large area uniform discharge , large active volume ,and uniform gain. The characteristics of pumping source are studied by developing a multichannel surface discharge model in this paper.
The design of the pumping source with multichannel surface discharge is introduced, and the trigger principle is analyzed theoretically. The system of parameter diagnostic and measurement has been set up. The discharge synchronism and uniformity of pumping source have been studied experimentally in two methods. The result of jitter time smaller than 40ns is
obtained. By studying different kinds of factors which affected the synchronization, the suitable experimental conditions for the operation of the pumping source have been obtained, and these conditions may be thought as the voltage of higher than 15kV, the pressure of 1-1.5 atm in the case of N2:Ar=3:7, the trigger voltage of higher than 30kV with the risetime
about 10ns. The discharge parameters of the pumping source as a function of different experimental conditions have been studied. The principle of photodissociation Xe?2 and the form of photodissociation wave (PDW) and the mechanism of XeF(C-A) laser have been described . The PDW photographs have been acquired under different deposited power in each channel. The
velocity of PDW and the plasma brightness temperature have been calculated, and the radiation level in VUV has been estimated.
引文
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