Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Lowering the lasing threshold of distributed feedback lasers with loss   We study laser generation in 1D distributed feedback lasers with amplifying
and lossy layers. We show that when the lasing frequency differs from the
transition frequencies of the amplifying medium, loss induced lasing may occur
due to the broadening of the resonator mode with increasing loss in the
absorbing layers. This broadening leads to a shift in the lasing frequency
towards the transition frequency. As a result, the cavity mode interaction with
the amplifying medium is enhanced, and the lasing threshold is lowered.

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The categories of this paper are: hep-lat
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The categories of this paper are: solv-int
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The categories of this paper are: patt-sol
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The categories of this paper are: acc-phys
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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: econ
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The categories of this paper are: cmp-lg
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The categories of this paper are: alg-geom
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The categories of this paper are: chem-ph
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The categories of this paper are: stat
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The categories of this paper are: supr-con
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The categories of this paper are: nucl-th
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The categories of this paper are: nlin
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The categories of this paper are: gr-qc
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The categories of this paper are: math-ph