Generation of infrared photon pairs by spontaneous four-wave mixing in a CS2-filled microstructured optical fiber
Mina Afsharnia, Saher Junaid, Sina Saravi, Mario Chemnitz, Katrin Wondraczek, Thomas Pertsch, Markus A. Schmidt, Frank Setzpfandt
Abstract
Abstract We experimentally demonstrate frequency non-degenerate photon-pair generation via spontaneous four-wave mixing from a novel CS 2 -filled microstructured optical fiber. CS 2 has high nonlinearity, narrow Raman lines, a broad transmission spectrum, and also has a large index contrast with the microstructured silica fiber. We can achieve phase matching over a large spectral range by tuning the pump wavelength, allowing the generation of idler photons in the infrared region, which is suitable for applications in quantum spectroscopy. Moreover, we demonstrate a coincidence-to-accidental ratio of larger than 90 and a pair generation efficiency of about $$10^{-2}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mn>10</mml:mn> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>2</mml:mn> </mml:mrow> </mml:msup> </mml:math> per pump pulse, which shows the viability of this fiber-based platform as a photon-pair source for quantum technology applications.