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Study of elementary processes for the lower laser level of the copper vapor laser

铜蒸气激光器低激光能级基本工艺研究

基本信息

批准号：
05452196
负责人：
GOTO Toshio
金额：
$ 4.42万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05452196/
关键词：
Cu metastable atoms diffusion coefficient electron collisional de-excitation saturated absorption spectroscopy copper vapor laser laser absorption spectroscopy 銅原子拡散定数

项目摘要

In the powerful and highly efficient copper vapor laser, the lower levels of the laser transitions are metastable states. The detailed knowledge of their relaxation processes is therefore of practical importance to improve the laser performance. In this study the diffusion and electron-collisional de-excitation processes for the metastable copper atoms were investigated, which determine the lifetime of the metastable atoms in the discharge.Copper vapor was produced in a discharge tube with a copper hollow cathode by cathodic sputtering. The diffusion coefficients for metastable copper atoms in Ne and Ar were determined from their density decay in the afterglow measured by using laser absorption spectroscopy. The diffusion coefficients for ground-state copper atoms in He, Ne, Ar were also determined by using absorption spectroscopy with a copper hollow cathode lamp used as a light source. It was found that the diffusion coefficients for the metastable and the ground-state copper atoms w … More ere essentially of the same magnitude, contrary to a reported result.A new method was developed to determine the lifetimes of metastable atoms in a steady-state discharge. The method is based on saturated absorption spectroscopy, in which a strong pump laser beam excites metastable atoms and a weak probe beam measures the reduction of their population due to the pump beam ; the analysis of the results with the aid of rate equations enables one to determine the lifetime of the metastable atoms. As was demonstated by experiments, the long lifetime of metastable atoms prevents the pump beam from causing hole burning in the velocity distribution of the atoms through collisional mixing of the populations with different velocities ; this allows one to use the rate-equation analysis. The obtained lifetime of the metastable copper atoms decreased with increasing discharge current. This indicates that their lifetime is mainly determined by electron-collisional destruction rather than by diffusion. This method of determining metastable-atom lifetime can be combined with electron density and temperature measurements to yield de-excitation rate constant for metastable atoms. Less

在高功率、高效率的铜蒸气激光器中，激光跃迁的低能级是亚稳态。因此，详细了解它们的弛豫过程对于提高激光性能具有重要的实际意义。本文研究了亚稳态铜原子的扩散和电子碰撞退激过程，这些过程决定了亚稳态铜原子在放电中的寿命。用激光吸收光谱法测量了亚稳态铜原子在氖和氩中的余辉密度衰减，确定了亚稳态铜原子在氖和氩中的扩散系数。用铜空心阴极灯作光源，用吸收光谱法测定了基态铜原子在He、Ne、Ar中的扩散系数。结果表明，亚稳态铜原子和基态铜原子的扩散系数随温度的升高而增大， ...更多信息提出了一种新的方法来确定稳态放电中亚稳态原子的寿命。该方法是基于饱和吸收光谱，其中强泵浦激光束激发亚稳原子和弱探测光束测量减少其人口由于泵浦光束;分析的结果与援助的速率方程使一个确定的寿命的亚稳原子。正如实验所证明的那样，亚稳态原子的长寿命防止泵浦光束通过具有不同速度的粒子群的碰撞混合在原子的速度分布中引起烧孔;这允许使用速率方程分析。亚稳态铜原子的寿命随放电电流的增加而降低。这表明它们的寿命主要由电子碰撞破坏而不是扩散决定。这种确定亚稳原子寿命的方法可以与电子密度和温度测量相结合，以产生亚稳原子的去激发速率常数。少