电子束泵浦百焦耳级准分子激光实验研究

Experimental Study on 100 J Level of Excimer Laser Pumped by REB

利用“闪光二号”相对论电子束加速器研制了百焦耳级ＸｅＣｌ和ＫｒＦ准分子激光器，激光器激活体积２４ｌ，输出口径２０×２０ｃｍ２，泵浦功率密度１．５～２．０ＭＷ／ｃｍ３。ＸｅＣｌ激光器最大能量１３６Ｊ，波长３０８ｎｍ，脉宽５０～１００ｎｓ，峰值功率１．５ＧＷ，采用虚共焦非稳腔技术，束散角达１．３ｍｒａｄ；ＫｒＦ激光最大能量１５７Ｊ，波长２４８ｎｍ，脉宽８０～１００ｎｓ，峰值功率２ＧＷ。

A 100 J level of XeCl and KrF excimer lasers pumped by an intense relativstic electron beam (REB) accelarator Flash Ⅱ has been developed. The laser cell has an effective excitation volume of 24 liters and a 20×20 cm 2 aperture. The pump power density ranges between 1.5-2.0 MW/cm 3. The maximum output energy of 136 J with the pulsewidth of 50-100 ns and peak power of 1.5 GW is obtained for the XeCl (308 nm) laser. The divergence angle is 1.3 mrad by using the positive confocal unstable resonator technique. In KrF (248 nm) laser case, the maximum output energy is 157 J with pulsewidth of 80-100 ns and peak power of 2 GW.