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Nonlinear optics in the VUV region utilizing autoionizing resonance of metallic atoms

利用金属原子自电离共振的 VUV 区域非线性光学

基本信息

批准号：
12440112
负责人：
NAKAJIMA Takashi
金额：
$ 9.73万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

项目摘要

We have carried out theoretical research on a new scheme for the efficient generation of VUV light, propagation dynamics of light pulses, and possible applications of the generated VUV light. Because of the space limitation, we describe here the most important achievement of our project, namely the theoretical analysis of the newly proposed fbrwave mixing scheme for the efficient generation of VUV light : it is well known that the re-absorption processes of the generated wave through frequency conversion is the most crucial limiting factor against increasing the conversion efficiency. In order to solve this essential problem, we have utilized an autoionizing state. An autoionizing resonance is always accompanied by an absorption minimum located nearby, which is due to the quantum mechanical interference via atomic coherence of an autoionizing state. Therefore, if the incident laser frequencies are tuned such that the frequency of the generated wave coincides with the transition frequen … More cy from the initial state to the absorption minimum of the final (autoionizing) state, re-absorption can be significantly suppressed. Our detailed analysis has shown that the conversion efficiency can be improved by three orders of magnitude.As for experiments, there are three important findings. First, by making use of a self-reversed absorption in an emission line of laser-induced plasma, we have developed a new method to determine the position-dependent densities of the corresponding upper and lower states, and applied it to the Al plasma. Second, we have developed a narrow-band pulsed dye-laser system, which is based on the amplification of a CW ring dye-laser by an excimer-pumped dye-laser. This narrow-band laser enables us to investigate the change of the translational velocity of laser-ablated species through optical detection. We have found that, in the time scale of a few microsecond after ablation in a buffer gas, the translational velocities of the ablated species exhibit pulsation. Less

我们对真空紫外光的高效产生新方案、光脉冲的传输动力学以及所产生的真空紫外光的可能应用进行了理论研究。由于篇幅的限制，我们在这里描述我们的项目，即新提出的fbr波混频方案的理论分析的最重要的成果，有效地产生真空紫外光：众所周知，通过频率转换产生的波的再吸收过程是最关键的限制因素对提高转换效率。为了解决这个基本问题，我们利用了自电离态。自电离共振总是伴随着一个位于附近的吸收最小值，这是由于自电离态的原子相干性引起的量子力学干涉。因此，如果调谐入射激光频率，使得所产生的波的频率与跃迁频率一致， ...更多信息 cy从初始状态到最终（自电离）状态的吸收最小值，可以显著抑制再吸收。我们的详细分析表明，转换效率可以提高三个数量级。至于实验，有三个重要的发现。首先，利用激光诱导等离子体发射谱线的自反转吸收，我们发展了一种新的方法来确定相应的上、下能级的位置依赖密度，并将其应用于Al等离子体。其次，我们开发了一种窄带脉冲染料激光系统，该系统基于准分子泵浦染料激光器对连续波环形染料激光器的放大。这种窄带激光使我们能够通过光学探测来研究激光烧蚀物种的平移速度的变化。我们发现，在缓冲气体中烧蚀后的几微秒的时间尺度内，烧蚀物种的平移速度表现出脉动。少