Generation of an ultrashort optical pulse by four-wave Raman mixing in deuterium cooled at 77 K

H. Otsuka, Zaitsu Shin-Ichi, T. Uchimura, T. Imasaka

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

When a 100-fs Ti : sapphire laser is focused into molecular deuterium cooled at 77 K, rotational stimulated Raman emission is generated based on four-wave Raman mixing. By phase locking the emission lines, the laser pulsewidth was reduced to 40 fs, when a nearly transform-limited pulse was utilized as a fundamental laser. The pulsewidth was further reduced to 20 fs, when a positively chirped pulse was employed. Computer simulation suggests that the Raman emission is strongly chirped and a train of pulses with lower intensities are formed when a chirp pulse is used as a fundamental laser.

Original languageEnglish
Pages (from-to)745-751
Number of pages7
JournalApplied Physics B: Lasers and Optics
Volume78
Issue number6
DOIs
Publication statusPublished - Apr 1 2004

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deuterium
pulses
lasers
chirp
locking
sapphire
computerized simulation

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Physics and Astronomy (miscellaneous)

Cite this

Generation of an ultrashort optical pulse by four-wave Raman mixing in deuterium cooled at 77 K. / Otsuka, H.; Shin-Ichi, Zaitsu; Uchimura, T.; Imasaka, T.

In: Applied Physics B: Lasers and Optics, Vol. 78, No. 6, 01.04.2004, p. 745-751.

Research output: Contribution to journalArticle

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AB - When a 100-fs Ti : sapphire laser is focused into molecular deuterium cooled at 77 K, rotational stimulated Raman emission is generated based on four-wave Raman mixing. By phase locking the emission lines, the laser pulsewidth was reduced to 40 fs, when a nearly transform-limited pulse was utilized as a fundamental laser. The pulsewidth was further reduced to 20 fs, when a positively chirped pulse was employed. Computer simulation suggests that the Raman emission is strongly chirped and a train of pulses with lower intensities are formed when a chirp pulse is used as a fundamental laser.

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