CAJ | 학술논문

利用Nd:YAG脉冲激光在空气中烧蚀金属Cu靶,获得等离子体光谱;采用改变离焦量的方法,研究了离焦量的变化对谱线结构及谱线强度的影响;分析了离焦量分别为1 mm、0 mm和-2 mm时,沿靶面法线方向不同空间距离处电子温度的演化规律;并对等离子体光谱的特性和产生机制进行了讨论.结果表明,谱线结构、谱线强度和等离子体的电子温度都与离焦量的变化密切相关,聚焦点在-2 mm处CuⅠ谱线相对强度出现峰值,电子温度数值最大;聚焦点在-0.5 mm和-1.0 mm附近谱线相对强度遽然降低的现象是由于等离子体的屏蔽效应造成的.
이용Nd:YAG맥충격광재공기중소식금속Cu파,획득등리자체광보;채용개변리초량적방법,연구료리초량적변화대보선결구급보선강도적영향;분석료리초량분별위1 mm、0 mm화-2 mm시,연파면법선방향불동공간거리처전자온도적연화규률;병대등리자체광보적특성화산생궤제진행료토론.결과표명,보선결구、보선강도화등리자체적전자온도도여리초량적변화밀절상관,취초점재-2 mm처CuⅠ보선상대강도출현봉치,전자온도수치최대;취초점재-0.5 mm화-1.0 mm부근보선상대강도거연강저적현상시유우등리자체적병폐효응조성적.
The plasma spectra have been measured with a pulsed Nd:YAG laser which induced plasma from a metal copper target.Varying defocusing distance the influence of the relative intensity and spectral structure in various laser focusing distances from the target is studied.Space distribution characters of electron temperature are measured with defocusing distances at 1 mm before target,0 mm on the sample surface,and 2 mm back the sample.At the same time we analyze the characteristics and mechanism of the plasma spectra.The results show that the spectral structure,spectral intensity and electron temperature prominently depend on the defocusing distances.The focusing position 2 mm back the sample surface can be found that produces the maximum of copper atom spectra intensity and the electron temperature maximum.And the phenomena that the spectral intensities fall off at the the focusing position 0.5 mm and 1.0 mm below the sample surface can be interpreted by the shielding effect.