We show the possibility of generating ultraslow temporal vector optical solitons in a cold lifetime-broadened four-level tripod atomic medium under Raman excitation. We demonstrate that the two orthogonally polarized components of the low-intensity signal field can evolve into various distortion-free temporal vector optical solitons, such as bright–bright vector solitons with ultraslow group velocity. These results are produced from the balance of self- and cross-phase modulation effects and dispersion. We also show that Manakov temporal vector solitons may be realized by adjusting the corresponding self- and cross-phase modulation and dispersion effects of our system.
© 2009 Optical Society of America
Original Manuscript: October 31, 2008
Revised Manuscript: December 2, 2008
Manuscript Accepted: December 17, 2008
Published: February 17, 2009
Liu-Gang Si, Wen-Xing Yang, and Xiaoxue Yang, "Ultraslow temporal vector optical solitons in a cold four-level tripod atomic system," J. Opt. Soc. Am. B 26, 478-486 (2009)