Title :
Propagation of femtosecond pulses in a resonantly absorbing medium: experimental test of a new definition of group velocity
Author :
Kohmoto, T. ; Fukuda, Y. ; Kunitomo, M. ; Fukui, Y. ; Furue, S. ; Nakayama, K.
Author_Institution :
Dept. of Phys., Kobe Univ., Japan
Abstract :
Summary form only given. According to the conventional expression the group velocity of optical pulses in resonantly absorbing media can exceed the light velocity in the vacuum and even become negative. Recently a new definition of group velocity has been proposed by means of the saddle point method. We observed the propagation of femtosecond optical pulses in a dye solution and experimentally tested the new definition of the group velocity.
Keywords :
Kramers-Kronig relations; absorption coefficients; dyes; light propagation; light velocity; optical Kerr effect; refractive index; Kramers-Kronig relations; absorption coefficient; delay between arrival times; dye solution; femtosecond optical pulse propagation; group delay; group velocity definition; methanol solution; optical-Kerrgate method; refractive index; resonantly absorbing medium; saddle point method; wavelength dependence; Optical Kerr effect; Optical propagation; Optical refraction;
Conference_Titel :
Quantum Electronics and Laser Science Conference, 2002. QELS '02. Technical Digest. Summaries of Papers Presented at the
Conference_Location :
Long Beach, CA, USA
Print_ISBN :
1-55752-708-3
DOI :
10.1109/QELS.2002.1031329
