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Phys Rev Lett. 2010 Jun 25;104(25):253602. Epub 2010 Jun 22.

Generation and compression of chirped biphotons.

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1
Edward L. Ginzton Laboratory, Stanford University, Stanford, California 94305, USA. sensarn@stanford.edu

Abstract

We describe an experiment demonstrating the radarlike technique of "chirp and compress." Chirped biphotons are generated using a quasi-phase-matched nonlinear crystal where the phase-matched frequency varies linearly with position. Sum frequency generation is used to measure the amplitude of the biphoton wave function. As compared to a nonchirped crystal, compression and an increase in summing efficiency of a factor of 5 is observed.

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