Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Transverse coherence of photon pairs generated in spontaneous parametric
  down-conversion   Coherence properties of the down-converted beams generated in spontaneous
parametric down-conversion are investigated in detail using an iCCD camera.
Experimental results are compared with those from a theoretical model developed
for pulsed pumping with a Gaussian transverse profile. The results allow to
tailor the shape of correlation area of the signal and idler photons using
pump-field and crystal parameters. As an example, splitting of a correlation
area caused by a two-peak pump-field spectrum is experimentally studied.

37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
24
The categories of this paper are: dg-ga
3
The categories of this paper are: physics
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat