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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 11 — Jun. 2, 2014
  • pp: 12944–12961

Wavelength conversion of incoherent light by sum-frequency generation

Shin Arahira and Hitoshi Murai  »View Author Affiliations

Optics Express, Vol. 22, Issue 11, pp. 12944-12961 (2014)

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In this paper, we reveal that some kinds of optical nonlinearities are further enhanced when incoherent light, instead of a laser, is used as a pump light. This idea was confirmed both theoretically and experimentally in the case of sum-frequency generation (SFG) using the optical second nonlinearity. The conversion efficiency of the SFG with incoherent light pumping increased as the bandwidth of the incoherent pump light decreased, finally reaching twice the conversion efficiency of conventional second harmonic generation (SHG) by laser pumping. This method dramatically relaxes the severe requirements of phase matching in the nonlinear optical process. The conversion efficiency became less sensitive to misalignment of the wavelength of pump light and also of device operation temperature when the bandwidth of the incoherent pump light was sufficiently broad, although the improvement of the conversion efficiency had an inverse relationship with the insensitivity to the phase-matching condition. The temperature tuning range was enhanced by more than two orders of magnitude in comparison with the conventional SHG method. As an example of a promising application of this new idea, we performed the generation of quantum entangled photon-pairs using cascaded optical nonlinearities (SFG and the subsequent spontaneous parametric down conversion) in a single periodically poled LiNbO3 waveguide device, in which the incoherent light was used as the pump source for both the parametric processes. We have achieved high fidelity exceeding 99% in quantum-state tomography experiments.

© 2014 Optical Society of America

OCIS Codes
(190.2620) Nonlinear optics : Harmonic generation and mixing
(230.4320) Optical devices : Nonlinear optical devices
(270.4180) Quantum optics : Multiphoton processes
(190.4975) Nonlinear optics : Parametric processes
(270.5565) Quantum optics : Quantum communications

ToC Category:
Nonlinear Optics

Original Manuscript: March 11, 2014
Revised Manuscript: April 20, 2014
Manuscript Accepted: May 13, 2014
Published: May 21, 2014

Shin Arahira and Hitoshi Murai, "Wavelength conversion of incoherent light by sum-frequency generation," Opt. Express 22, 12944-12961 (2014)

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