Spectral characterization of a SPDC source with a fast broadband spectrometer

• DOI: 10.48550/arxiv.2307.06843
• Publication Date: 2024-04-01
• Authors: Brianna Farella; Gregory Medwig; Raphael A. Abrahao; Andrei Nomerotski
• Keywords: Quantum Physics; Physics - Instrumentation and Detectors; Physics; QC1-999; FOS: Physical sciences; Instrumentation and Detectors (physics.ins-det); Quantum Physics (quant-ph); 7. Clean energy; Physics - Optics; Optics (physics.optics)

Knowing the properties of single photons produced in a Spontaneous Parametric Down-Conversion (SPDC) source can be crucial for specific applications and uses. In particular, the spectral properties are of key relevance. Here, we investigate a commercial SPDC source using our fast broadband spectrometer. Our analysis is a valid method for other SPDC sources, as well as other single-photon generation techniques, thus providing a good example of how to use this spectrometer design. We calibrate the spectrometer using known lines of the argon emission spectrum. We show that the two down-converted photons from the SPDC source have different spectral properties depending on the pump power, and under which condition we measured spectrally similar down-converted photons. Finally, we were able to reconstruct and investigate the spectral information for the pump photon.