Amplified spontaneous emission in slab amplifiers

Chana Goren*, Yitzhak Tzuk, Gilad Marcus, Shaul Pearl

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

Amplified spontaneous emission (ASE) occurs in media with large gain, and affects both the magnitude and the spatial distribution of the inversion. In this work we theoretically study the effect of ASE in three-dimensional, rectangular slab amplifiers, using Monte Carlo type computer simulations. We found that in one-dimensional amplifiers ASE is always larger at the edges so that the inversion has a maxima at the center of the amplifier. However, in two- and three-dimensional amplifiers, the inversion has a minimum at the center of the amplifier for low gain, and a maximum at the center of the amplifier for high gain. Thus, the inversion profile can be changed by increasing the gain from a minimum at the center, through a plateau, to a maximum at the center. A simple analytical theory was developed and agrees with these results.

Original languageAmerican English
Pages (from-to)1239-1247
Number of pages9
JournalIEEE Journal of Quantum Electronics
Volume42
Issue number12
DOIs
StatePublished - Dec 2006
Externally publishedYes

Keywords

  • Amplified spontaneous emission (ASE)
  • Slab amplifiers for high-power lasers

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