Abstract
Spontaneous parametric down-conversion is an essential tool for a quantum light source in the infrared region ranging 2–5 µm for the purpose of material identification, chemical analysis, and gas sensing. So far, photon pairs from the process in a nonlinear crystal have low tunability and a narrow spectral range because of the phase-matching condition. Here, we propose a novel type of spontaneous parametric down-conversion processes that overcomes these challenges, where two photon pairs are simultaneously produced in the visible and infrared regions in periodically poled stoichiometric lithium tantalite. It allows broadband and tunable generation of infrared photon pairs that can be employed as an alternative light source for quantum infrared spectroscopy.
Highlights
Spontaneous parametric down-conversion is an essential tool for a quantum light source in the infrared region ranging 2–5 μm for the purpose of material identification, chemical analysis, and gas sensing
Using the spontaneous parametric downconversion (SPDC) photon pairs whose wavelengths are in the visible and IR region, respectively, the spectral information about the IR idlers can be obtained by measuring the visible signal interferogram
The spectral window and tunability of the SPDC light source have so far been limited by the phase-matching condition, because the frequencies of the signal-idler pairs are determined by the pump wavelength, the radiation angles of the SPDC photons, and the refractive index of the nonlinear crystal
Summary
Spontaneous parametric down-conversion is an essential tool for a quantum light source in the infrared region ranging 2–5 μm for the purpose of material identification, chemical analysis, and gas sensing. Quantum infrared spectroscopy[1,2,3,4] (QIS) is an emerging method for investigating the fundamental absorption band and characterizing the properties of materials This technique employs a spontaneous parametric downconversion (SPDC) process, where one photon (pump) is split into two entangled photons (signal and idler) in a nonlinear crystal. The spectral window and tunability of the SPDC light source have so far been limited by the phase-matching condition, because the frequencies of the signal-idler pairs are determined by the pump wavelength, the radiation angles of the SPDC photons, and the refractive index of the nonlinear crystal.
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