Amplified Spontaneous Emission in Slab Amplifiers

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...

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Bibliographic Details
Published in:IEEE journal of quantum electronics 2006-12, Vol.42 (12), p.1239-1247
Main Authors: Goren, C., Tzuk, Y., Marcus, G., Pearl, S.
Format: Article
Language:English
Subjects:
Amplification
Amplified spontaneous emission (ASE)
Amplifiers
Computer simulation
Distributed amplifiers
Doped-insulator lasers and other solid state lasers
Doping
Exact sciences and technology
Fiber lasers
Fundamental areas of phenomenology (including applications)
Gain
Inversions
Laser noise
Laser optical systems: design and operation
Lasers
Monte Carlo methods
Optical amplifiers
Optics
Physics
Pump lasers
Resonators, cavities, amplifiers, arrays, and rings
slab amplifiers for high-power lasers
Slabs
Spontaneous emission
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Summary: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
ISSN:0018-9197
1558-1713
DOI:10.1109/JQE.2006.884580