Flat-plateau supercontinuum generation in liquid absorptive medium by femtosecond filamentation.
We have studied filamentation and supercontinuum generation by focusing the intense femtosecond laser pulses into an absorptive medium (CuSO(4) aqueous solution). A broad spectrum from 350 to 950 nm with a flat plateau spanning approximately from 450 to 700 nm with a flatness of 9% is obtained without any additional filters. The results indicate that the absorptive medium not only suppresses the strong surplus femtosecond laser signal but also flattens the supercontinuum spectrum efficiently.
Wang
Li
L
Department of Physics and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China.
Fan
Ya-Xian
YX
Yan
Zhen-Dong
ZD
Wang
Hui-Tian
HT
Wang
Zhen-Lin
ZL