Ultrabright long biphoton generation with non-linear optical material

Patent metadata

Field	Value
Publication number	US-8970944-B2
Application number	US-201313866616-A
Country	US
Kind code	B2
Filing date	Apr 19, 2013
Priority date	Apr 19, 2012
Publication date	Mar 3, 2015
Grant date	Mar 3, 2015

Abstract

Improved production of entangled photon pairs (biphotons) via spontaneous parametric down conversion (SPDC) is provided. In one aspect, forward-wave SPDC is performed in a monolithic resonator (resonant for both signal and idler) having a double pass pump geometry to provide a spectrally bright source of biphotons. In another aspect, backward-wave SPDC is performed in a resonator (resonant for both signal and idler) to provide a spectrally bright source of biphotons. For either of these approaches, the biphotons can be made to have polarization entanglement by using quasi phasematching (QPM) with two QPM periods simultaneously.

First claim

The invention claimed is:

1. A biphoton source comprising:
a source of pump radiation; and
a nonlinear optical medium configured to receive the pump radiation and to provide phase-matched spontaneous parametric down-conversion (SPDC) of the pump radiation to provide co-propagating signal radiation and idler radiation;
wherein the nonlinear optical medium comprises two endfaces of the medium coated to reflect both the signal radiation and the idler radiation, and having endface…

Assignees

• Univ Leland Stanford Junior

Inventors

• Chuu Chih-Sung
• Yin Guang-Yu
• Harris Stephen E

Classifications

• G02F1/39 Primary

  Physics · mapped topic

• G02F2001/3542

  Physics · mapped topic

• G02F1/3542

  Physics · mapped topic