Temperature insensitive type II quasi-phasematched spontaneous parametric downconversion

The temperature dependence of the refractive indices of potassium titanyl phosphate (KTP) are shown to enable quasi-phasematched type II spontaneous parametric downconversion (SPDC) with low temperature sensitivity. Calculations show the effect to be maximised for emission of photons at around 1165n...

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Bibliographic Details
Published in:arXiv.org 2020-12
Main Authors: Xin-Yi, Pan, Kurtsiefer, Christian, Ling, Alexander, Grieve, James A
Format: Article
Language:English
Subjects:
Emission
Low temperature
Photons
Potassium titanyl orthophosphate
Refractivity
Telecommunications
Temperature dependence
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Summary:The temperature dependence of the refractive indices of potassium titanyl phosphate (KTP) are shown to enable quasi-phasematched type II spontaneous parametric downconversion (SPDC) with low temperature sensitivity. Calculations show the effect to be maximised for emission of photons at around 1165nm, as well as producing potentially useful regions for wavelengths throughout the telecommunications bands. We demonstrate the effect experimentally, observing temperature-insensitive degenerate emission at 1326nm, within the telecommunications O band. This result has practical applications in the development of entangled photon sources for resource-constrained environments, and we demonstrate a simple polarization entangled source as a proof of concept.
ISSN:2331-8422
DOI:10.48550/arxiv.2012.05134