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

fYear

2002

fDate

19-24 May 2002

Firstpage

214

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/QELS.2002.1031329

Filename

1031329