Thermal loss mechanism in the generation of multifrequency laser emission via stimulated Raman scattering and four-wave Raman mixing studied by photothermal refraction spectroscopy |
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Authors: | Y Hirakawa T Tomooka T Imasaka |
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Institution: | (1) Department of Chemical Systems and Engineering, Graduate School of Engineering, Kyushu University, Hakozaki, Fukuoka 812-8581, Japan (Fax: +81-92/632-5209, E-mail: imasaka@cstf.kyushu-u.ac.jp), JP |
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Abstract: | The heat produced in conjunction with the processes of stimulated Raman scattering and four-wave Raman mixing in hydrogen
was measured by photothermal refraction spectroscopy. Many vibrational, rotational, and vibrationally shifted rotational Raman
lines are exclusively/simultaneously generated by changing the polarization of the laser beam and the hydrogen pressure. Thermal
loss occurs predominantly from vibrational Raman scattering, which can be ascribed to a large Raman shift frequency of 4155 cm-1 for the vibrational transition. In contrast to stimulated Raman scattering, little or no thermal loss is observable during
the process of four-wave Raman mixing.
Received: 12 April 1999 / Revised version: 12 July 1999 / Published online: 20 October 1999 |
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Keywords: | PACS: 42 65 51 70 |
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