中国物理B ›› 2015, Vol. 24 ›› Issue (4): 43201-043201.doi: 10.1088/1674-1056/24/4/043201

• ATOMIC AND MOLECULAR PHYSICS • 上一篇    下一篇

Theoretical study of amplified spontaneous emission intensity and bandwidth reduction in polymer

A. Hariri, S. Sarikhani   

  1. Laser and Optics Research School, North Kargar Avenue, P. O. Box 11365-8486, Tehran, Iran
  • 收稿日期:2014-07-09 修回日期:2014-11-08 出版日期:2015-04-05 发布日期:2015-04-05

Theoretical study of amplified spontaneous emission intensity and bandwidth reduction in polymer

A. Hariri, S. Sarikhani   

  1. Laser and Optics Research School, North Kargar Avenue, P. O. Box 11365-8486, Tehran, Iran
  • Received:2014-07-09 Revised:2014-11-08 Online:2015-04-05 Published:2015-04-05
  • Contact: A. Hariri E-mail:akbar_hariri@yahoo.com

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摘要：

Amplified spontaneous emission (ASE), including intensity and bandwidth, in a typical example of BuEH-PPV is calculated. For this purpose, the intensity rate equation is used to explain the reported experimental measurements of a BuEH-PPV sample pumped at different pump intensities from Ip=0.61 MW/cm2 to 5.2 MW/cm2. Both homogeneously and inhomogeneously broadened transition lines along with a model based on the geometrically dependent gain coefficient (GDGC) are examined and it is confirmed that for the reported measurements the homogeneously broadened line is responsible for the light-matter interaction. The calculation explains the frequency spectrum of the ASE output intensity extracted from the sample at different pump intensities, unsaturated and saturated gain coefficients, and ASE bandwidth reduction along the propagation direction. Both analytical and numerical calculations for verifying the GDGC model are presented in this paper. Although the introduced model has shown its potential for explaining the ASE behavior in a specific sample it can be universally used for the ASE study in different active media.

关键词: amplified spontaneous emission, bandwidth reduction, polymers, gain coefficient

Abstract:

Amplified spontaneous emission (ASE), including intensity and bandwidth, in a typical example of BuEH-PPV is calculated. For this purpose, the intensity rate equation is used to explain the reported experimental measurements of a BuEH-PPV sample pumped at different pump intensities from Ip=0.61 MW/cm2 to 5.2 MW/cm2. Both homogeneously and inhomogeneously broadened transition lines along with a model based on the geometrically dependent gain coefficient (GDGC) are examined and it is confirmed that for the reported measurements the homogeneously broadened line is responsible for the light-matter interaction. The calculation explains the frequency spectrum of the ASE output intensity extracted from the sample at different pump intensities, unsaturated and saturated gain coefficients, and ASE bandwidth reduction along the propagation direction. Both analytical and numerical calculations for verifying the GDGC model are presented in this paper. Although the introduced model has shown its potential for explaining the ASE behavior in a specific sample it can be universally used for the ASE study in different active media.

Key words: amplified spontaneous emission, bandwidth reduction, polymers, gain coefficient

中图分类号:  (Fluorescence, phosphorescence (including quenching))

  • 32.50.+d
32.70.Jz (Line shapes, widths, and shifts) 32.80.-t (Photoionization and excitation)