Journal
OPTICS EXPRESS
Volume 22, Issue 5, Pages 5913-5926Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.22.005913
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Funding
- foundation for Fundamental Research on Matter (FOM)
- Netherlands Organisation for Scientific (NWO)
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We explore spatial correlations created by stimulated pair emission in frequency degenerate parametric down-conversion from a periodically poled KTP crystal pumped by similar to 2 ps duration laser pulses. The ratio of stimulated pairs over spontaneous pairs reaches as high 0.8 in the experiment. This ratio is a direct measure of the total number of modes relevant to the down-conversion process. We identify a universal curve for this ratio that accounts for the effect of the focused pump, introducing a coherence diameter r(0) related to the diffraction limited size of the pump beam in the far-field. Measurements of the spatial correlations of the PDC light for longer crystals and tight focusing conditions show that the description given in terms of a universal curve is surprisingly robust and breaks down only for a laser beam focussed to a waist smaller than 40 mu m in a 2 mm long PPKTP crystal. (C) 2014 Optical Society of America
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