Low-coherence interferometry with undetected mid-infrared photons in the high-gain regime
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 μm, with a 3 μm-centered idler beam. By increasing the poling-period range, we also improve the axial resolution to 17 μm, demonstrating a straightforward route to enhance the performance by working on the crystal design.
Authors
- Yoad Michael (ORCID: https://orcid.org/0000-0003-4126-4507)
- Mikhail I. Kolobov (ORCID: https://orcid.org/0000-0001-7059-5220)
- Kazuki Hashimoto (ORCID: https://orcid.org/0009-0001-2873-7894)
- Maria V. Chekhova (ORCID: https://orcid.org/0000-0002-3399-2101)
- D. B. Horoshko (ORCID: https://orcid.org/0000-0003-2550-948X)
- G. Zotti
- Ziv Gefen
Institutions
- Technion – Israel Institute of Technology (IL)
- Friedrich-Alexander-Universität Erlangen-Nürnberg (DE)
- Crystal Research (United States) (US)
- Laboratoire de Physique des Lasers, Atomes et Molécules (FR)
- The University of Tokyo (JP)
- University of Bologna (IT)
Publication Details
- Journal
- Optics Letters
- Published
- 2025-11-12
- DOI
- https://doi.org/10.1364/ol.578129
- Primary Topic
- Photorefractive and Nonlinear Optics
- Type
- article
- Field-Weighted Citation Impact
- 0.00