Influence of Finite Lower-level Lifetime on the Performance in CW Four level Laser

Yu Jin; Meng Hongxiang; Jieng Yu

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Influence of Finite Lower-level Lifetime on the Performance in CW Four level Laser

Article | 更新时间：2020-08-12

- Influence of Finite Lower-level Lifetime on the Performance in CW Four level Laser
- Optics and Precision Engineering Vol. 5, Issue 3, Pages: 7-11(1997)
- 作者机构：
  
  中国科学院长春光学精密机械研究所长春,130022
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：12 September 1996，
  
  Published Online：15 June 1997，
  
  Published：15 June 1997
- 稿件说明：
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余锦, 孟红祥, 荆宇. 有限的下能级寿命对四能级激光器工作特性的影响[J]. 光学精密工程, 1997,(3): 7-11

Yu Jin, Meng Hongxiang, Jieng Yu. Influence of Finite Lower-level Lifetime on the Performance in CW Four level Laser[J]. Editorial Office of Optics and Precision Engineering, 1997,(3): 7-11
余锦, 孟红祥, 荆宇. 有限的下能级寿命对四能级激光器工作特性的影响[J]. 光学精密工程, 1997,(3): 7-11 DOI：

Yu Jin, Meng Hongxiang, Jieng Yu. Influence of Finite Lower-level Lifetime on the Performance in CW Four level Laser[J]. Editorial Office of Optics and Precision Engineering, 1997,(3): 7-11 DOI：

摘要

在考虑了有限的下能级寿命和激光能级与晶格场的相互作用的基础上

对四能级激光的速率方程组进行了求解。结果表明由于这个有限寿命的存在

激光阈值升高

输出与输入之间出现了非线性。与下能级瞬时跃迁的理想情况不同

泵浦功率增大时

四能级激光器的输出趋向于一个极限值

并且

下能级寿命越长

激光器所能获得的最大输出越小。

Abstract

The rate equations for a continuous four-level laser are solved in this letter

taking into account the finite lower-level lifetime and the crystal field splitting of the laser levels. It is shown that the existence of this finite lower-level lifetime raises the threshold

nonlinearizes the in-and-out relationship and acts as an ultimate role in limiting the achievable output power for a four-level laser

instead of the ideal case of infinite achievable power while the relaxation from the lower-level is regarded as instantaneous.

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