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POPURATION INVERSION IN FLAME EXCITED BY MICROWAVE FOR COMBUSTION DERIVED LASER EMISSION

Research Project

Project/Area Number 14350408
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 化学工学一般
Research InstitutionNAGOYA UNIVERSITY

Principal Investigator

ITAYA Yoshinori  NAGOYA UNIV., DEPT.CHEM.ENG., ASSOC.PROF., 工学研究科, 助教授 (50176278)

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)
Project Period (FY) 2002 – 2003
Project Status Completed (Fiscal Year 2003)
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)
KeywordsMICROWAVE / LASER / COMBUSTION / ENERGY CONVERSION / LASER MANUFACTURING / ENERGY LEVEL / POPURATION INVERSION / GAS RADIATION
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.

Report

(3 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • Research Products

    (3 results)

All Other

All Publications (3 results)

  • [Publications] 板谷義紀, 内山茂, E.F.Cabrido, 羽多野重信, 森滋勝: "導電性粒子流動層の乱反射を利用したマイクロ波電界強度の均一化効果"化学工学論文集. 29. 339-344 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] YOSHINORI ITAYA, SHIGERU UCHIYAMA, ERWIN F.CABRIDO, SHIGENOBU HATANO, SHIGEKATSU MORI: "UNIFORMITY OF MICROWAVE FIELD INTENSITY BY RANDUM REFLECTION IN A FLUIDIZED BED OF ELECTRICALLY CONDUCTIVE BEADS"KAGAKU KOGAKU RONBUNSHU. 29-3. 33-344 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 板谷義紀, 内山茂, E.F.Cabrido, 羽多野重信, 森滋勝: "導電性粒子流動層の乱反射を利用したマイクロ波電界強度の均一化効果"化学工学論文集. 29・3. 339-334 (2003)

    • Related Report
      2003 Annual Research Report

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Published: 2002-04-01   Modified: 2016-04-21  

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