Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Phase Sensitive Amplifier Based on Ultrashort Pump Pulses   We demonstrate a narrow band phase sensitive amplifier in the pump degenerate
configuration which employs ps pump pulses. Control of the amplifier bandwidth
is achieved via changes of the pump spectral width. A phase sensitive gain
between -6 and 6 decibels, with an overall system gain of 28dB was
demonstrated.

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The categories of this paper are: q-alg
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The categories of this paper are: math
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The categories of this paper are: chem-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: hep-lat
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The categories of this paper are: adap-org
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The categories of this paper are: alg-geom
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The categories of this paper are: chao-dyn
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The categories of this paper are: patt-sol
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-th
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The categories of this paper are: nucl-th
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The categories of this paper are: econ
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The categories of this paper are: astro-ph
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The categories of this paper are: q-fin
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The categories of this paper are: comp-gas