Yuanyuan Song, Ding Chen, Shuang Cong. Property of Entangled Photon Pairs Generated via Spontaneous Parametric Down Conversion[J]. Laser & Optoelectronics Progress, 2019, 56(4): 043002
- Laser & Optoelectronics Progress
- Vol. 56, Issue 4, 043002 (2019)
Fig. 1. Schematic of experimental device for generation of entangled photon pairs via type-II spontaneous parametric down conversion. (a) Collinear matching; (b) non-collinear matching
Fig. 2. Illustration of type-II SPDC light field
Fig. 3. Single photon spectra of signal light (s) and idle light (i) under different parameters. (a) Ω>0; (b) Ω<0; (c) D+≠0; (d) D+=0
Fig. 4. Source function graphs when continuous light used as pump. (a1) (a2) 3D and 2D plots of phase matching function; (b1) (b2) 3D and 2D plots of pumping linear function; (c1) (c2) 3D and 2D plots of combined spectral function; (d) single photon spectra
Fig. 5. 3D plots of pumping linear functions, 3D plots and 2D plots of combined spectral functions, single photon spectra under different spectral widths of pulsed laser. (a1) (b1) (c1) (d1) σp=0.5 nm; (a2) (b2) (c2) (d2) σp=2 nm; (a3) (b3) (c3) (d3) σp=5 nm
Fig. 6. 3D plots of pumping linear functions, 3D plots of phase matching functions, 3D plots and 2D plots of combined spectral functions, single photon spectra under different crystal thicknesses. (a) σp=1 nm; (b1) (c1) (d1) (e1) L=0.5 nm; (b2) (c2) (d2) (e2) L=1 mm; (b3) (c3) (d3) (e3) L=3 mm
Fig. 7. Combined two-photon spectra under different frequency correlation. (a) Non-correlation; (b) positive correlation
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Table 1. Frequency entanglement and interference visibility under different spectral widths of pulsed laser
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Table 2. Frequency entanglement and interference visibility under different crystal thicknesses
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