Experimental observation on spectrum evolution of femtosecond pulses in filamentation.
We present an experimental observation on spectrum evolution of femtosecond pulses in filamentation by introducing a hollow fiber as a probe and moving it along the filament. The results show that at a particular position of the filament, the pulse spectrum from the hollow fiber expands to its maximum, which corresponds to the shortest pulse duration existing in the filament. The influence of gas pressure on the spectrum broadening is also examined.
Cao
Shiying
S
Wang
Ying
Y
Huang
Wenjie
W
Chai
Lu
L
Wang
Chingyue
C
Yang
Jianjun
J
Zhu
Xiaonong
X
Zhang
Zhigang
Z