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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 5 — Mar. 11, 2013
  • pp: 5879–5890

Spectral engineering by Gaussian phase-matching for quantum photonics

P. Ben Dixon, Jeffrey H. Shapiro, and Franco N. C. Wong  »View Author Affiliations

Optics Express, Vol. 21, Issue 5, pp. 5879-5890 (2013)

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We demonstrate Gaussian-shaped phase matching of a periodically-poled potassium titanyl phosphate (PPKTP) crystal by imposing a custom duty-cycle pattern on its grating structure while keeping the grating period fixed. The PPKTP’s phase-matching characteristics are verified through optical difference-frequency generation measurements, showing good agreement with expected values based on our design parameters. Our theoretical analysis predicts that under extended phase-matching conditions the custom-poled PPKTP crystal is capable of generating heralded single photons with a spectral purity of 97%, and can reach as high as 99.5% with gentle spectral filtering, something that is highly desirable for photonic quantum information processing applications.

© 2013 OSA

OCIS Codes
(190.4410) Nonlinear optics : Nonlinear optics, parametric processes
(270.5585) Quantum optics : Quantum information and processing

ToC Category:
Quantum Optics

Original Manuscript: December 21, 2012
Revised Manuscript: February 21, 2013
Manuscript Accepted: February 21, 2013
Published: March 1, 2013

P. Ben Dixon, Jeffrey H. Shapiro, and Franco N. C. Wong, "Spectral engineering by Gaussian phase-matching for quantum photonics," Opt. Express 21, 5879-5890 (2013)

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