Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Semiclassical Analysis of Spectral Singularities and Their Applications
  in Optics   Motivated by possible applications of spectral singularities in optics, we
develop a semiclassical method of computing spectral singularities. We use this
method to examine the spectral singularities of a planar slab gain medium whose
gain coefficient varies due to the exponential decay of the intensity of
pumping beam inside the medium. For both singly- and doubly-pumped samples, we
obtain universal upper bounds on the decay constant beyond which no lasing
occurs. Furthermore, we show that the dependence of the wavelength of the
spectral singularities on the value of the decay constant is extremely mild.
This is an indication of the stability of optical spectral singularities.

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The categories of this paper are: chem-ph
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The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
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The categories of this paper are: q-alg
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The categories of this paper are: solv-int
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The categories of this paper are: stat
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The categories of this paper are: adap-org
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The categories of this paper are: econ
12
The categories of this paper are: nucl-th
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The categories of this paper are: comp-gas
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The categories of this paper are: atom-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: acc-phys
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The categories of this paper are: nlin
4
The categories of this paper are: cond-mat