驱动场相位扩散对三能级梯型系统无反转激光的影响

朱孟正; 赵春然; 张峰; 尹新国; 戴建明

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驱动场相位扩散对三能级梯型系统无反转激光的影响

论文 | 更新时间：2020-08-11

- 驱动场相位扩散对三能级梯型系统无反转激光的影响
- The Influence of Driving-field Phase Diffusion on Lasing without Inversion in a Cascade System
- 发光学报 2007年28卷第3期页码：302-306
- 作者机构：
  
  淮北煤炭师范学院, 物理系,安徽淮北,235000
- 作者简介：
- 基金信息：
  
  安徽省科技创新团队项目(2006KJ003TD)();安徽省高等学校青年教师科研基金(2005jq1133)资助项目()
- DOI：
  中图分类号： O431.2;O432.1+2
- 收稿日期：2006-10-29，
  
  修回日期：2006-12-27，
  
  纸质出版日期：2007-05-20
- 稿件说明：
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朱孟正, 赵春然, 张峰, 尹新国, 戴建明. 驱动场相位扩散对三能级梯型系统无反转激光的影响[J]. 发光学报, 2007,28(3): 302-306

ZHU Meng-zheng, ZHAO Chun-ran, ZHANG Feng, YIN Xin-guo, DAI Jian-ming. The Influence of Driving-field Phase Diffusion on Lasing without Inversion in a Cascade System[J]. Chinese Journal of Luminescence, 2007,28(3): 302-306
朱孟正, 赵春然, 张峰, 尹新国, 戴建明. 驱动场相位扩散对三能级梯型系统无反转激光的影响[J]. 发光学报, 2007,28(3): 302-306 DOI：

ZHU Meng-zheng, ZHAO Chun-ran, ZHANG Feng, YIN Xin-guo, DAI Jian-ming. The Influence of Driving-field Phase Diffusion on Lasing without Inversion in a Cascade System[J]. Chinese Journal of Luminescence, 2007,28(3): 302-306 DOI：

摘要

在旋波、慢变振幅近似下

求解考虑了驱动场相位扩散后的系统密度矩阵运动方程

并给出了这个三能级梯型系统稳态线性解析解.利用得到的稳态线性解析解分析驱动场相位扩散是如何影响该系统输出无反转激光的.对稳态线性解析解数值计算的结果显示:由于驱动场相位扩散会导致无反转激光增益减小;即使由于驱动场相位扩散引起的线宽足够大

在该系统中仍能够获得无反转激光;线宽往往是破坏无反转激光产生和折射率的提高;因驱动场相位扩散导致无反转激光增益的减小

并不是总能够通过增大驱动场的Rabi频率得到补偿.

Abstract

The influence of driving field phase fluctuation on lasing without population inversion in a three-level cascade system was studied. In the rotating wave and slowly varying envelope approximations

the density-matrix motion equations for the three-level cascade system

considered the influence of driving-field phase diffusion is solved

and the exact linear analytical solutions of the three-level cascade system with the driving field having the phase fluctuation in the steady state are obtained. The dependence of LWI gain

dispersion and the populations on the probe field detuning and the strengths of coherent pumping

respectively

are examined and simulated numerically. It was shown from the results of numerical calculation about the steady-state solutions of three-level cascade system that the gain of lasing without population inversion will be decreased due to driving-field phase-fluctuation. The effect can be compensated by increased driving-field intensities. However

the effect that LWI gain is decreased due to driving-field phase-fluctuation can not be always compensated by increased driving field Rabi frequency. Lasing without population inversion is still obtained even if the linewidth due to driving-field phase-fluctuation is large enough. The pre-sence of the linewidth prevents the cascade system from obtaining a high refractive index along with zero absorption. The cascade system can still exhibit a larger refractive index and zero absorption at the lesser linewidth. The linewidth tends to destroy lasing without population inversion and refractive index enhancement. There is no population inversion for the lasing transition and for the driving transition under the given condition. And the condition without population inversion has nothing to do with the variety of linewidth in the steady-state analytical solutions. That is to say

there is not possibility for the cascade system that a change from lasing with population inversion to lasing without population inversion can occur with the linewidth increasing or with the Rabi frequency of driving-field increasing. The conclusion is very different from that obtained in other inversionless lasing system.

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references

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