2020/12/09 by Xin-Yi Pan, Christian Kurtsiefer, Alexander Ling +1
Materials Science · Physics and Astronomy · #Degenerate energy levels #Luminescence Properties of Advanced Materials #Parametric statistics #Photon #Photorefractive and Nonlinear Optics #Polarization (electrochemistry) #Potassium titanyl phosphate #Random lasers and scattering media #Spontaneous emission #Spontaneous parametric down-conversion #Stimulated emission #Wavelength #physics.optics #quant-ph
paper · pdf · doi:10.1063/5.0052239
5 pages, 7 figures
arxiv created 2020/12/09 · openalex created_date 2020/12/21 · openalex publication_date 2021/07/12 · arxiv updated 2021/08/11 · openalex updated_date 2026/08/05
The temperature dependence of the refractive indices of potassium titanyl phosphate (KTP) is shown to enable quasi-phasematched type II spontaneous parametric downconversion (SPDC) with low temperature sensitivity. Calculations show the effect to be maximized for emission of photons at around 1165 nm, as well as producing similar plateaus for wavelengths throughout the telecommunications bands. We experimentally demonstrate the effect, observing temperature-insensitive degenerate emission between 20 °C and 100 °C at 1327 nm, within the telecommunications O band. This result has practical implications for the development of entangled photon sources for resource-constrained environments, and we demonstrate a simple polarization entangled source as a proof of concept.