权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

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

微波激发燃烧激光发射火焰中的粒子数反转

基本信息

批准号：
14350408
负责人：
ITAYA Yoshinori
金额：
$ 10.94万
依托单位：
NAGOYA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14350408/
关键词：
MICROWAVE LASER COMBUSTION ENERGY CONVERSION LASER MANUFACTURING ENERGY LEVEL POPURATION INVERSION GAS RADIATION

项目摘要

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.

发展高功率、高效激光器是激光功率产业化应用的必要条件。传统激光器的激发仅依赖于电力。这种激光器不仅需要大量的电力来发射高功率，而且很难引入利用除激光发射的有效能量之外的能量的系统。这项工作的目的是开发一种由燃料和/或辅助电力的燃烧能产生的高功率激光的高效系统，用于制造。研究了陶瓷燃烧器中甲烷-空气混合物的微波强化燃烧，以检验新型激光发射的原理。结果表明假设的分子能级玻尔兹曼分布存在扰动。使用 CO_2 激光器检测到小信号增益，它代表介质中入射光束的放大水平。当燃烧区受到频率为2.45 GHz的微波照射时，两个MCT光电探测器的信号比增加，表明波长为10.6 μm的红外辐射被放大。另一方面，通过FT-IR对微波照射的火焰中的红外辐射的吸收进行光谱分析。 H_2O和CO_2分子在2.7和4.2μm波段的吸收受到微波对能级的激发作用的影响，使得处于高能级的分子总数大于热力学平衡状态。此外，拉曼光谱分析也证实了这一效果。这些事实意味着通过微波照射燃烧产生激光发射的可能性。