The fourth harmonic output of Ti:sapphire laser was performed using the prism-coupling technique of KBe 2BO 3F 2 (KBBF) crystal. The shortest harmonic output wavelength is 179.4nm.

• 使用KBe2 BO3 F2 (KBBF)晶体的棱镜耦合技术实现了Ti:Sapphire激光的 4倍频 ；最短输出波长已可达到 179.；4nm。