High-power ultraviolet 278-nm laser from fourth-harmonic generation of an Nd:YAG amplifier in CsB
3
O
5
crystal
He Miao
1, 2, 3
, Yang Feng
1, 2, †
, Dong Cheng
1, 2, 3
, Wang Zhi-Chao
1, 2
, Yuan Lei
1, 2
, Xu Yi-Ting
1, ‡
, Zhang Guo-Chun
2
, Wang Zhi-Min
1, 2
, Bo Yong
1, 2
, Peng Qin-Jun
1, 2
, Cui Da-Fu
1
, Wu Yi-Cheng
2
, Xu Zu-Yan
1, 2
Measured spectrum of the UV laser.