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A twin optically-pumped far-infrared CH3OH laser for plasma diagnostics |
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| Authors: | M Yamanaka Y Takeda S Tanigawa A Nishizawa N Noda J Fujita M Takai M Shimobayashi Y Hayashi T Koizumi K Nagasaka S Okajima Y Tsunawaki and A Nagashima |
| Institution: | (1) Department of Applied Physics, Osaka University, Yamada-Kami, 565 Suita, Osaka, Japan;(2) Institute of Plasma Physics, Nagoya University, 464 Nagoya, Japan;(3) Department of Electrical Engineering, Kansai University, 564 Suita, Osaka, Japan;(4) Department of Physics, Science University of Tokyo, 162 Tokyo, Japan;(5) Department of Applied Physics, Chubu Institute of Technology, 487 Kasugai, Aichi, Japan;(6) Department of Chemistry, Osaka Industrial University, 574 Daito, Osaka, Japan;(7) Tokai Research Establishment, Japan Atomic Energy Research Institute, 319-11 Naka, Ibaraki, Japan;(8) Present address: Applied Communication Divisions, Fujitsu Ltd., 1015 Kamiodanaka, 211 Kawasaki, Japan;(9) Present address: CANON Electronics Co., Inc., Chichibu, 369-18 Saitama, Japan |
| Abstract: | A twin optically-pumped far-infrared CH3OH laser has been constructed for use in plasma diagnostics. The antisymmetric doublet due to the Raman-type resonant two-photon transition is reproducibly observed at 118.8  m. With the 118.8-m line, it is obtained from the frequency separation of the anti-symmetric doublet that CH3OH absorption line center is 16±1 MHz higher than the pump 9.7-m P(36) CO2 laser line center. It is shown that the Raman-type resonant two-photon transition is useful in order to get several-MHz phase modulation for the far-infrared laser interferometer. Some preliminary performances of this twin laser for the modulated interferometer are described.This work was carried out under the collaborating research program at the Institute of Plasma Physics, Nagoya University, Nagoya 464, Japan. |
| Keywords: | optically-pumped far-infrared laser CH3OH two photon transition modulated interferometer plasma diagnostics waveguide |
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