193nm ArF准分子激光器

本文报告高功率紫外光预电离ArF准分子激光器的实验研究。使用F_2+Ar+He混合气体作为工作介质,已获得ArF最大脉冲激光能量219毫焦耳,总效率0.5％左右。本器件并可输出KrF激光,最大脉冲激光能量424毫焦耳,总效率约1％。激光器是由内径为8.4cm的玻璃钢圆筒做成,长94cm。电极采用张氏均匀场型面电极,电极有效平区宽5mm,电极长80cm,两电极之间距离为2.1cm,因此激活体积为80×2.1×0.5cm~3。放电采用LC反转电路,主放电电容为平板电容,电容量分别为C_1=12nF和C_2=     

X射线预电离KrF激光器——预电离电子密度对激光输出功率的影响

本文介绍的是X射线预电离KrF激光器的输出特性。利用瞬时X射线发生器在激光气体中产生1.5×108个/厘米3电子。此法能获得1.0毫焦耳能量(电效率0.93%),比用金属丝电晕放电所获得的70毫焦耳能量要大。KrF激光起始振荡的电子密度大约为107个/厘米3,而且激光的输出能量随着电子密度的增加而增大。     

193毫微米ArF准分子激光器

本文报导改进的193毫微米ArF准分子激光器,单脉冲输出激光能量超过200毫焦耳。详细地研究了紫外光预电离对输出性能的影响。     

NOCI在308nm激光作用下的碎裂和电离研究

氯化亚硝酰(NOCl)的光化学和光谱学早在20年代就受到了人们的重视。它的紫外光解离机制以及光解产物的内能态一直是人们热衷研究的课题。近年来,人们利用ArF,KrF和低功率XeCl激光又对此进行了研究,发现在ArF,KrF激光作用下,NOCl光解生成电子激     

输出0.42焦耳的紫外光预电离KrF准分子激光器

本文报导了高功率、高效率紫外光预电离KrF(λ=248毫微米)准分子激光器的实验研究.输出最大脉冲能量超过420毫焦耳.研究了KrF激光器的激光谱和荧光谱特性以及在混合气体中掺入Ne气的影响.     

氟化氩激光器适于作辐射状角膜切除术

各种准分子激光对眼作用的研究表明193 nm ArF激光最适于作辐射状角膜切除术的切口。在角膜上作这些切口，目的是改变眼的曲率半径而减轻近视程度。伊里诺斯大学医学院的Gholam Peyman及其同事比较了XeCl、KrF和ArF准分子激光对动物眼组织的作用。三者之中ArF准分子激光输出波长最短，作的切口最精细，而光凝固作用最轻。     

重复率KrF、XeCl激光器的运转特性

本文报导一台实用的纵向流动 KrF、XICI 准分子激光器,得到单脉冲能量大于200毫焦耳,脉冲重复率10赫、平均输出功率大于1瓦的结果。     

将皮秒脉冲放大到几焦耳量级

美国的卢瑟福·阿普尔顿实验室的科学家首次将KrF准分子激光的皮秒脉冲大到几焦耳量级。     

脉冲激光能量自动打印测量装置

本文介绍了一种能够准确自动计量脉冲激光能量的自动打印测量装置，该装置的灵敏度为38.0微伏／毫焦耳。测试范围500毫焦耳到5毫焦耳，误差小于5％。     

氟化氦激光器输出3千焦耳

美国洛斯·阿拉莫斯国家实验室在对电子束泵浦的氟化氪(KrF)激光器“极光”的一次成功的试验中已把3千焦耳辐射能释放在纸靶上，其脉冲宽度为400毫微秒。     

Simultaneous multiwavelength operation of a commercial rare gas halide laser

Simultaneous dual wavelength operation of a commercial-discharge excited rare gas halide excimer laser is reported for the first time. A combined energy output in excess of 20 mJ was obtained for the 193 and 248 nm ArF and KrFB rightarrow Xtransitions oscillating simultaneously, and also for the 248 and 351 nm KrF and XeF transitions. Analysis indicates that significantly higher dual wavelength energies should be possible.     

Kinetics of proton-excited Ar-F2and Kr-F2mixtures

Mixtures of Ar and F2and of Kr and F2were excited with pulsed proton beams. Time-resolved spectra as well as time-integrated spectra were employed to study the detailed mechanism of production and quenching processes of ArF*, KrF*, Ar2F*, and Kr2F*. The kinetics of ArF*, KrF*, and XeF* lasers are discussed briefly.     

宽带高光束质量KrF激光器的实验研究

利用SBS作为相位共轭镜,对宽带KrF自由振荡激光器的光束质量进行了改善。在KrF激光能量为36mJ,脉宽为13.7ns,束散角为9.5倍衍射限的条件下,获得输出能量为20.8mJ,脉宽为4.3ns,束散角为6.4倍衍射限的高光束质量宽带KrF激光。     

ArF准分子激光器的窄线宽可调谐运转及注入放大

在一台快放电泵浦的ＡｒＦ准分子激光振荡放大系统的振荡级上采用光栅、扩束镜、光阑等腔内元件，用组合输出镜获得了线宽小于０．１ｎｍ，调谐范围～１ｎｍ的激光输出。注入到非稳腔结构的放大级，注入后放大级效率提高了约５０％，获得了平均３０ｍＪ／脉冲的高光束质量的窄线宽可调谐激光，最大单脉冲能量＞５０ｍＪ，并进行了氧气的吸收光谱实验。     

纳秒级宽带KrF激光时间脉冲整形

对纳秒级宽带KrF激光脉冲的时间整形进行了研究。采用受激布里渊散射(SBS)脉冲压缩KrF激光获得短脉冲,通过脉冲堆积获得KrF激光时间整形脉冲。利用激光放大器对整形脉冲进行放大,对KrF激光整形脉冲的形状影响较大。通过对放大前整形脉冲形状的调整,在放大后可以得到所需形状的整形脉冲,一次放大能量输出可达50 mJ,二次放大能量输出可达300 mJ。理论分析与实验结果一致。研究表明,短脉冲堆积和放大器放大的组合方案具有较强的整形能力。     

Photodissociative generation of population inversion in alkali noble gas excimer systems

Alkali noble gas excimer molecules are produced by photodissociation of alkali halogen vapor in a high-pressure noble gas atmosphere. Experimental details for NaI-Xe and CsI-Xe systems excited by 193 nm ArF or 249 nm KrF laser radiation are given, and the possibility of realizing an optically pumped alkali noble gas excimer laser is discussed.     

Laser cleanup of H2S from synthesis gas

Hydrogen sulfide at the 10 ppm level has been selectively stripped from a CO + H2synthesis gas by photolysis with an ArF laser. The sulfur in the atomic or radical form is irreversibly removed by a metal surface. Spectroscopic and quantum yield data are presented. An H2S spectroscopic selectivity less than 10⁷was measured in the 210-220 nm range, a wavelength range compatible with Raman-shifted ArF or KrF lasers. The laser purification method described here is a potential approach to achieve sulfur impurity levels greater than 0.1 ppm. This method is of potential industrial significance for extending the lifetime of syngas metal catalysts.     

New lines in the UV: SRS of excimer laser wavelengths

The UV excimer lasers ArF, KrCl, KrF, and XeCl were utilized to create new families of UV lines by multiple orders of broad-band nonresonant stimulated Raman scattering (SRS) in the media H2, D2, CH4, and LN2. Mixed-media and excited-state SRS were also studied.     

Operating characteristics of a high repetition rate miniature rare-gas halide laser

Performance characteristics of a high repetition rate rare-gas halide minilaser are reported. At 1 kHz pulse repetition frequency over 1 mJ per pulse at KrF and 0.5 mJ per pulse at XeCl wavelengths are obtained. Net small-signal gains greater than 0.3 cm^-1are observed in XeCl. The wall plug efficiency is measured to be as high as 0.25 percent.     

光栅掠入射腔对ArF激光线宽的压缩和调谐

对国内首次研制成功的ArF准分子激光器实现了窄线宽可调谐运转,提出并利用光栅掠入射腔实现了线宽小于0．020nm的窄线宽和连续调谐运转,注入到放大级实现了脉冲能量大于40mJ的窄线宽可调谐激光输出。设计利用氧气吸收光谱对处于真空紫外的ArF激光实现了波长标定和线宽的准确测量。