Anomalous laser-induced group velocity dispersion in fused silica.
We present 20fs(2) accuracy laser-induced group velocity dispersion (LI-GVD) measurements, resulting from propagation of a femtosecond laser pulse in 1mm of fused silica, as a function of peak intensity. For a 5.5 × 10(11) W/cm(2) peak intensity, LI-GVD values are found to vary from -3 to + 15 times the material GVD. Normal induced dispersion can be explained by the Kerr effect, but anomalous LI-GVD, found when the input pulses have negative pre-chirp, cannot. These findings have significant implications regarding self-compression and the design of femtosecond lasers.
Department of Chemistry, Michigan State University, East Lansing, MI 48824, USA.
Gennady
G
Rasskazov
Anton
A
Ryabtsev
Dmitry
D
Pestov
Bai
B
Nie
Vadim V
VV
Lozovoy
Marcos
M
Dantus
D017076:Computer-Aided Design; D004735:Energy Transfer; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007834:Lasers; D008027:Light; D012542:Scattering, Radiation; D012822:Silicon Dioxide / Q000737:chemistry* / Q000528:radiation effects*
D012822:Silicon Dioxide