Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Complete characterization of weak, ultrashort near-UV pulses by spectral
  interferometry   We present a method for a complete characterization of a femtosecond
ultraviolet pulse when a fundamental near-infrared beam is also available. Our
approach relies on generation of second harmonic from the pre-characterized
fundamental, which serves as a reference against which an unknown pulse is
measured using spectral interference (SI). The characterization apparatus is a
modified second harmonic frequency resolved optical gating setup which
additionally allows for taking SI spectrum. The presented method is linear in
the unknown field, simple and sensitive. We checked its accuracy using test
pulses generated in a thick nonlinear crystal, demonstrating the ability to
measure the phase in a broad spectral range, down to 0.1% peak spectral
intensity as well as retrieving pi leaps in the spectral phase.

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The categories of this paper are: hep-ph
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
31
The categories of this paper are: ao-sci