POPURATION INVERSION IN FLAME EXCITED BY MICROWAVE FOR COMBUSTION DERIVED LASER EMISSION
| Project/Area Number |
14350408
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
化学工学一般
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| Research Institution | NAGOYA UNIVERSITY |
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Principal Investigator |
ITAYA Yoshinori NAGOYA UNIV., DEPT.CHEM.ENG., ASSOC.PROF., 工学研究科, 助教授 (50176278)
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| Co-Investigator(Kenkyū-buntansha) |
KOBAYASHI Jun NAGOYA UNIV., CENTER FOR COOPERATIVE RESEARCH IN ADVANCED SCI. & TECH., RES.ASSOC., 先端技術共同研究センター, 助手 (60314035)
KOBAYASHI Nobusuke NAGOYA UNIV., DEPT.CHEM.ENG., RES.ASSOC., 工学研究科, 助手 (30345920)
MORI Shigekatsu NAGOYA UNIV., CENTER FOR COOPERATIVE RESEARCH IN ADVANCED SCI. & TECH., PROF., 先端技術共同研究センター, 教授 (90024306)
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| Project Period (FY) |
2002 – 2003
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| Project Status |
Completed (Fiscal Year 2003)
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| Budget Amount *help |
¥17,100,000 (Direct Cost: ¥17,100,000)
Fiscal Year 2003: ¥5,500,000 (Direct Cost: ¥5,500,000)
Fiscal Year 2002: ¥11,600,000 (Direct Cost: ¥11,600,000)
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| Keywords | MICROWAVE / LASER / COMBUSTION / ENERGY CONVERSION / LASER MANUFACTURING / ENERGY LEVEL / POPURATION INVERSION / GAS RADIATION |
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| Research Abstract |
Development of high power and high efficient laser is necessary for introducing industrial applications of laser power. Excitation of the conventional lasers is dependent of only electric power. Such lasers don't only require huge electricity in order to emit a high power, but also it is difficult to introduce a system utilizing energy except for the effective energy for laser emission. The objective of this work is to develop the efficient system of a high power laser derived by combustion energy of fuels and/or auxiliary electricity for manufacturing.
Microwave enhanced combustion of methane-air mixture in a ceramic burner is studied to examine the principle of a new laser emission. The results suggest perturbation of the assumed Boltzmann distribution of molecular energy levels. A small signal gain, which represents the level of amplification of an incident beam in a medium, was detected using a CO_2 laser. An increase in the signal ratio of two MCT photodetectors when the combustion zone was irradiated by microwave of 2.45 GHz in the frequency indicates amplification of infrared radiation at 10.6 μm in wavelength. On the other hand, absorption of infrared radiation in the flame irradiated by microwave was analyzed spectroscopically by the FT-IR. The absorption in 2.7 and 4.2 μm bands of H_2O and CO_2 molecules was influenced by the effect of excitation to energy levels by microwave so that the population of molecules at upper energy levels than the grand level becomes greater than a thermo-dynamic equilibrium state. In addition, this effect was confirmed by Raman spectroscopic analysis as well. These facts imply the possibility of combustion derived laser emission by irradiation of microwave.
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Report
(3 results)
Research Products
(3 results)
