Long-wave infrared up-conversion detection based on ZnGeP2 crystal
Longwave infrared (LWIR) detection is achieved through nonlinear upconversion with a ZnGeP<sub>2</sub> crystal. The target LWIR light interacts efficiently with a 1.06 μm probe laser, converting into a near-infrared signal. This detection configuration offers the following advantages: a broad response wavelength band of 9.69-12.38 μm and a high optical-to-optical responsivity of 150-200%, attributed to the enhanced properties of a custom-fabricated ZnGeP<sub>2</sub> crystal. Theoretical interpretations of these experimental outcomes are based on coupled-wave equations. At room temperature, the system achieves a minimal detectable energy in the sub-fJ (ns pulses) range. It has the potential for wide-field imaging when designed as noncritical phase matching, owing to its large acceptance angle.
Authors
- Weifan Li (ORCID: https://orcid.org/0000-0003-1871-8355)
- Zuotao Lei (ORCID: https://orcid.org/0000-0003-2383-3999)
- Xu Guo (ORCID: https://orcid.org/0000-0001-6523-8114)
- Pengxiang Liu (ORCID: https://orcid.org/0000-0002-8626-7157)
- Qiang Fu (ORCID: https://orcid.org/0000-0001-5371-8460)
- Wei Li (ORCID: https://orcid.org/0000-0003-4258-9864)
- Liyuan Guo (ORCID: https://orcid.org/0000-0002-2187-4298)
- Feng Qi (ORCID: https://orcid.org/0009-0008-1153-9892)
Institutions
- Shenyang Institute of Automation (CN)
- Shandong University (CN)
- Chinese Academy of Sciences (CN)
- Harbin Institute of Technology (CN)
- University of Chinese Academy of Sciences (CN)
Publication Details
- Journal
- Optics Letters
- Published
- 2025-02-07
- DOI
- https://doi.org/10.1364/ol.555362
- Primary Topic
- Infrared Target Detection Methodologies
- Type
- article
- Field-Weighted Citation Impact
- 0.00