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Title

Ultrabright femtosecond source of biphotons based on a spatial mode inverter

Author(s)

Jarutis, Vygandas;  Juodkazis, Saulius;  Mizeikis, Vygantas;  Sasaki, Keiji;  Misawa, Hiroaki

Abstract

A method of enhancing the efficiency of entangled biphoton sources based on a type II femtosecond spontaneous parametric downconversion (SPDC) process is proposed and implemented experimentally. Enhancement is obtained by mode inversion of one of the SPDC output beams, which allows the beams to overlap completely, thus maximizing the number of SPDC photon pairs with optimum spatiotemporal overlap. By use of this method, biphoton count rates as high as 16 kHz from a single 0.5-mm-long β-barium borate crystal pumped by second-harmonic radiation from a Ti:sapphire laser were obtained.

Publication type

Journal article

Source

Optics Letters, Vol. 30, no. 3 (Feb 2005), pp. 317-319

Publication year

2005

FOR Code(s)

0205 Optical Physics

Keyword(s)

Biphotons;  Cameras;  Charge coupled devices;  Crystalline materials;  Light polarization;  Nonlinear optics;  Nonpolarizing beam splitters;  NPBS;  Optical beam splitters;  Phase matching;  Photons;  Pumping laser;  Second harmonic generation;  SPDC;  Spontaneous parametric downconversion;  Vectors

Publisher

Optical Society of America

ISSN

0146-9592

Publisher URL

http://dx.doi.org/10.1364/ol.30.000317

Copyright

Copyright © 2005 Optical Society of America. This paper was published in Optics Letters and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://dx.doi.org/10.1364/ol.30.000317. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.

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