Stimulated Raman scattering and four-wave Raman mixing seeded by a supercontinuum generated in dibromomethane using picosecond and femtosecond laser sources |
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Authors: | Hiroyuki Kawano Tomonori Mori Yasuyuki Hirakawa Totaro Imasaka |
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Institution: | Department of Chemical Science and Technology, Faculty of Engineering, Kyushu University, Hakozaki, Fukuoka 812, Japan |
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Abstract: | Stimulated Raman emission from liquid dibromomethane (vibrational Raman shift frequency, 588 cm−1) is introduced into hydrogen gas (rotational Raman shift frequency, 587 cm−1) as a seed beam, in order to generate numerous rotational lines by four-wave Raman mixing. Unexpectedly, a supercontinuum, which is generated by self-phase modulation in dibromomethane, acted as a seed beam to exclusively generate vibrational lines; the rotational lines are generated only when the supercontinuum is minimal. The former is explained by a competition between the high-gain vibrational and low-gain rotational Raman effects when strongly seeded by a supercontinuum. The latter is explained by stimulated Raman gain under the seed effect exclusively to the first-Stokes rotational line. |
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Keywords: | Raman scattering Dibromomethane Hydrogen gas |
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