Related papers: Low-coherence interferometry with undetected mid-infrared photons in the high-gain regime

Low-coherence interferometry with undetected mid-infrared photons in the high-gain regime

URL: http://arxiv.org/abs/2509.03349v1
Date: Wed, 03 Sep 2025 14:34:59 GMT
Title: Low-coherence interferometry with undetected mid-infrared photons in the high-gain regime
Authors: Giovanni Zotti, Dmitri B. Horoshko, Mikhail I. Kolobov, Yoad Michael, Ziv Gefen, Maria V. Chekhova, Kazuki Hashimoto,
Abstract summary: We develop a high-parametric-gain SU (1,1) interferometer based on an aperiodically poled Potassium Titanyl Phosphate (apKTP) crystal.<n>The system achieves a signal-to-noise ratio as high as 40 dB and axial resolution of 30 $mu$m, with a 3 $mu$m-centered idler beam.
Score: 0.0
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: We develop a high-parametric-gain SU(1,1) interferometer based on an aperiodically poled Potassium Titanyl Phosphate (apKTP) crystal, enabling frequency-domain low-coherence interferometry with undetected mid-infrared photons. The system achieves a signal-to-noise ratio as high as 40 dB and axial resolution of 30 $\mu$m, with a 3 $\mu$m-centered idler beam. By increasing the poling-period range, we also improve the axial resolution to 17 $\mu$m, demonstrating a straightforward route to enhance the performance by working on the crystal design

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