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Correlated photon-pair generation in a periodically poled MgO doped stoichiometric lithium tantalate reverse proton exchanged waveguide

2011; American Institute of Physics; Volume: 99; Issue: 8 Linguagem: Inglês

10.1063/1.3628328

1520-8842

Mirko Lobino, Graham D. Marshall, Chunle Xiong, Alex S. Clark, Damien Bonneau, Chandra M. Natarajan, Michael G. Tanner, Robert H. Hadfield, S. N. Dorenbos, T. Zijlstra, Val Zwiller, Marco Marangoni, Roberta Ramponi, Mark G. Thompson, Benjamin J. Eggleton, Jeremy L. O’Brien,

Photonic and Optical Devices

We demonstrate photon-pair generation in a reverse proton exchanged waveguide fabricated on a periodically poled magnesium doped stoichiometric lithium tantalate substrate. Detected pairs are generated via a cascaded second order nonlinear process where a pump laser at wavelength of 1.55 μm is first doubled in frequency by second harmonic generation and subsequently downconverted around the same spectral region. Pairs are detected at a rate of 42/s with a coincidence to accidental ratio of 0.7. This cascaded pair generation process is similar to four-wave-mixing where two pump photons annihilate and create a correlated photon pair.