Characterization of
periodically poled LiTaO 3 crystals by means of
spontaneous parametric down-conversion K.A. Kuznetsov1,
H.C. Guo2, Gs.Kh. Kitaeva1  , A.A. Ezhov1,
D.A. Muzychenko1, A.N. Penin1
and S.H. Tang2
| (1) |
Department of Physics, M.V.
Lomonosov Moscow State University, 119992 Moscow,
Russia |
| (2) |
Department of Physics,
National University of Singapore, Singapore, 117542,
Singapore |
Received:
20 November 2005 Revised:
31 January 2006 Published
online: 29 March 2006
Abstract We describe
the observation of quasi-phase-matched spontaneous parametric
down-conversion in eee-geometry in periodically poled
LiTaO 3 crystals. For scattered light, the
two-dimensional angular-frequency intensity distribution was
studied. Several detuning curves were recorded, corresponding
to high orders m=-2, -3, -4, -5 of quasi-phase matching. The
measured periods of domain gratings agree with the data
obtained by atomic-force microscopy for the etched crystal
surfaces. The presence of both odd and even orders indicates
that the lengths of positive and negative domains are unequal.
To determine the mean duty cycle for regular domain gratings
we propose comparing of the intensities of spontaneous
parametric down-conversion in different orders of
quasi-phase-matching.
PACS 42.65.Lm; 42.70.Mp; 81.70.Fy; 78.67.Pt;
42.65.Yj
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