Study on photoionization in a rubidium diode-pumped alkali laser gain medium with the optogalvanic method

被引：12
|
作者：
Ge, Lun [1 ]
Hua, Weihong [1 ]
Wang, Hongyan [1 ]
Yang, Zining [1 ]
Xu, Xiaojun [1 ]
机构：
[1] Natl Univ Def Technol, Coll Optoelect Sci & Engn, Changsha 410073, Hunan, Peoples R China
来源：
OPTICS LETTERS | 2013年 / 38卷 / 02期
基金：
中国国家自然科学基金;
关键词：
IONIZATION;
D O I：
10.1364/OL.38.000199
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We use the optogalvanic method to calculate the concentration of rubidium ions produced by photoionization in a Rb diode-pumped alkali laser gain medium. With bias voltage added across the electrodes of a rubidium hollow cathode lamp, the measured optogalvanic current is 2.3 x 10(-7) A. Further study shows that the rubidium ion concentration is proportional to the pump intensity, and the drift velocity of rubidium ions is proportional to the bias voltage. When the photoionization process reaches dynamic equilibrium, the rubidium ion concentration will not increase with growing rubidium atom density. The calculated rubidium ion concentration is 1.5 x 10(5)-10(6) according to the experiment, and the ionization degree is less than 2.4 x 10(-7). (C) 2013 Optical Society of America
引用
收藏
页码：199 / 201
页数：3
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