1.9-W flash-lamp-pumped solid-state 266-nm ultraviolet laser

Deep ultraviolet lasers have various applications in industries and scientific researches.For 266-nrn ultraviolet (UV) laser generation,the good beam quality of 1064-nm laser and the elimination of gray-tracking effect of KTP crystal are two key factors.Using a dynamically stable resonator design,1064-nnl laser with an average power of 52 W is realized with repetition rate of 16 kHz.The measured M2 factor characterizing the beam quality is 1.5.By the elimination of gray-tracking effect of KTP crystal,an 18-W green laser is realized with the M2 factor of 1.6.Using a BBO crystal for tire fourth harmonic generation,a 1.9-W 266-nm UV laser is achieved.