Open AccessGeneration of Entangled Photons by A Short Coherence Length Violet Diode Laser
Author(s) -
Ra'ad Subhi Abbood,
Ahmed I. Khaleel,
Shelan Kh. Tawfeeq
Publication year - 2013
Publication title -
mağallaẗ diyālá li-l-ʿulūm al-handasiyyaẗ/mağallaẗ diyālá li-l-ʻulūm al-handasiyyaẗ
Language(s) - English
Resource type - Journals
eISSN - 2616-6909
pISSN - 1999-8716
DOI - 10.24237/djes.2013.06206
Subject(s) - optics , crystal (programming language) , diode , photon , laser , wavelength , coincidence , laser diode , coherence (philosophical gambling strategy) , physics , blue laser , phase matching , materials science , optoelectronics , quantum mechanics , medicine , pathology , computer science , programming language , alternative medicine
Pumping a BBO crystal by a violet diode laser with a wavelength of (405 nm) output power of (24 mW) and a line width of (3nm) was employed to generate entangled photons with a wavelength of 810 nm by achieving type II phase matching conditions. The coincidence count rate obtained in this experiment was in the range of (18000) counts/s. Two BBO crystals with different thicknesses of (4 mm and 2 mm) were tested, where maximum count rates of about (18000) counts/s was obtained with a (5*5*2) mm BBO crystal where the short coherence time for the pumping source was tolerated by using shorter BBO crystals. Also, the effect of compensating crystal on the walk-off effect was studied. The coincidence count rates were increased by using these crystals when their optic axes were fixed in the opposite direction relative to the optic axis of the original BBO crystal