• Journal of the Korean Physical Society
• /
• v.73 no.11
• /
• pp.1650-1656
• /
• 2018

Photons generated via spontaneous parametric down-conversion (SPDC) have broad spectrums and suffer from dispersive broadening of the temporal wave packets when they are transmitted through dispersive media. In this paper we theoretically and experimentally study the detailed amount of the temporal broadening of the two-photon wave packets generated via both type-I and type-II SPDC with ${\beta}-BaB_2O_4$ of various lengths, by transmitting them through optical fibers. We interpret the results with respect to the spectral properties of the two-photon wave packets. We believe that our results will contribute to implementing protocols involving long-range distributions of photon pairs.

• Korean Journal of Optics and Photonics
• /
• v.32 no.1
• /
• pp.29-33
• /
• 2021

We have experimentally simulated the violation of the Leggett-Garg inequality (LGI) using a heralded-single-photon source via spontaneous parametric down-conversion (SPDC) in a periodically poled potassium titanyl phosphate (PPKTP) crystal. We measured the polarization fringe as a function of the angle of the linear polarization of the photons, and analyzed the LGI according to n measurement. Simulation results for LGI based on the polarization of the heralded single photon were in good agreement with theoretical calculations.

• Proceedings of the Optical Society of Korea Conference
• /
• 2001.08a
• /
• pp.196-197
• /
• 2001

• Korean Journal of Optics and Photonics
• /
• v.12 no.6
• /
• pp.431-436
• /
• 2001

The effect of decorrelation on the coincidence is investigated with correlated photons produced by parametric down-conversion process. The degree of correlation between photon pairs is adjusted by changing the polarization dependent transmissivities of thin glass plate\ulcorner in front of two detectors. It was found that the single counts of each detectors are proportional to the transmissivity and the coincidence is proportional to the product of transmissivities of the glasses in front of two detectors.

• Korean Journal of Optics and Photonics
• /
• v.14 no.6
• /
• pp.573-577
• /
• 2003

We report an effect of photon pairs on single-photon detection rates, while Hong-Ou-Handel's two-photon interference experiment is performed with photons produced in noncollinear type-I parametric down-conversion. Photon pairing behavior or spatial bunching is measured and shown to cause a decrease in the single photon counting rate. Such a dip is found to result from the fact that the single-photon timing resolution of photodetectors is much longer compared to the time interval between the two photons incident on the single-photon detector.

• Current Optics and Photonics
• /
• v.2 no.6
• /
• pp.606-611
• /
• 2018

Measurement of the nonlinear optical coefficients is not an easy task since it requires complicated experimental setup and analysis. We suggest an easy way to estimate the relative nonlinear optical tensor components by direct measurement of the output powers of the second harmonic generation and spontaneous parametric down conversion experiments. The experiments were done in quasi-phase-matched type-0 as well as type-1 interactions at similar pump wavelengths in a 5% MgO-doped periodically poled $LiNbO_3$ crystal to obtain the ratio of the nonlinear optical tensor components $d_{33}/d_{31}$ in each experiment. The obtained ratios were then compared with the previously ascertained values [J. Opt. Soc. Am. B, 14, 2268-2294 (1997)].

• Proceedings of the Optical Society of Korea Conference
• /
• 2009.02a
• /
• pp.197-198
• /
• 2009

• Proceedings of the Optical Society of Korea Conference
• /
• 2001.08a
• /
• pp.194-195
• /
• 2001

• Proceedings of the Optical Society of Korea Conference
• /
• 2009.10a
• /
• pp.86-87
• /
• 2009

• Proceedings of the Optical Society of Korea Conference
• /
• 2007.02a
• /
• pp.351-352
• /
• 2007