Abstract

Photon pair sources have wide ranging applications in a variety of quantum photonic experiments and protocols. Many of these protocols require well controlled spectral correlations between the two output photons. However, due to low cross-sections, measuring the joint spectral properties of photon pair sources has historically been a challenging and time-consuming task. Here, we present an approach for the real-time measurement of the joint spectral properties of a fiber-based four wave mixing source. We seed the four wave mixing process using a broadband chirped pulse, studying the stimulated process to extract information regarding the spontaneous process. In addition, we compare stimulated emission measurements with the spontaneous process to confirm the technique’s validity. Joint spectral measurements have taken many hours historically and several minutes with recent techniques. Here, measurements have been demonstrated in 5–30 s depending on resolution, offering substantial improvement. Additional benefits of this approach include flexible resolution, large measurement bandwidth, and reduced experimental overhead.

© 2018 Optical Society of America

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Supplementary Material (2)

NameDescription
» Visualization 1       Video showing the speed at which JSI slices are acquired. For the level of resolution shown here, the measurement takes 5 s. This measurement was performed with an Ocean Optics USB2000+ spectrometer.
» Visualization 2       Video showing a higher resolution JSI acquisition with a measurement time of 22 s. This measurement was performed with the Acton SP2300 spectrometer and ProEM EMCCD camera.

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