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Observation of the Hong-Ou-Mandel Dip by Using Type-I Spontaneous Parametric Down Conversion Light with a Low-Cost Coincidence Circuit
New Phys.: Sae Mulli 2017; 67: 1528~1533
Published online December 29, 2017;
© 2017 New Physics: Sae Mulli.

Sung-Wook HAN1, Munkhbaatar PUREVDOR2,3, Hyung-Nam NOH4, Heonoh KIM5, Myung-Whun KIM*1,2

1 Department of Physics, Chonbuk National University, Jeonju 54896, Korea
2 Institute of Photonics and Information Technology, Chonbuk National University, Jeonju 54896, Korea 
3 Department of Physics and Electronics, National University of Mongolia, Ulaanbaatar 210646, Mongolia
4 True System Co. LTD., Sungnam 13516, Korea
5 Department of Physics, Busan National University, Busan 46241, Korea
Correspondence to:
Received September 29, 2017; Revised October 13, 2017; Accepted October 13, 2017.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
We fabricated a photon pair source by using a type-I spontaneous parameter down conversion generated by injecting a 405 nm continuous wave laser into a $\beta$-barium borate single crystal. We designed a single-photon interferometer and a Hong-Ou-Mandel interferometer by using a low-cost, homemade, transistor transistor logic-positive emitter coupled logic (TTL-PECL) coincidence circuit. The single-photon interferometer experiment confirmed that the light source had photon characteristics. The Hong-Ou-Mandel interferometer experiment showed a dip signal when the path difference between the interfering photons was close to zero. Analysis of the interfering signal confirmed that the coherence time between the photon pair was about 187 fs.
PACS numbers: 07.60.Ly, 07.50.-e, 42.25.Hz, 42.50.-p, 42.50.Ar
Keywords: Spontaneous parametric down conversion, Hong-Ou-Mandel interferometer, Coincidence circuit

April 2018, 68 (4)
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