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arXiv · 2606.10695

Length-dependent SWIR upconversion spectral response of noncritically phase-matched KTP crystals

Xiao-Hua Wang·Chang-Hao Min·Yin-Hai Li·Zhi-Yuan Zhou·Bao-Sen Shi
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Abstract

Noncritically phase-matched (NCPM) KTP crystals support large-aperture bulk operation, avoid spatial walk-off, and relax angular-alignment requirements, making them attractive for short-wave infrared upconversion detection. To guide crystal selection for different detection requirements, we quantitatively characterize how crystal length affects the coverage and profile of their external upconversion spectral responses. A calibrated Czerny--Turner monochromator is used to measure the responses of 0.5, 1.0, and 2.0 mm crystals and compare them with theoretical quantum-efficiency spectra calculated from the phase-matching model. With increasing crystal length, the response evolves from a broad profile with weak peak separation to a more distinct double-peak structure, accompanied by reduced coverage bandwidth. A representative pump-power measurement further yields the system-level external quantum-efficiency slope. These results clarify the trade-off between spectral coverage and wavelength selectivity for different crystal lengths and can be used to choose the crystal length for SWIR upconversion detection systems.

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Xiao-Hua Wang, Chang-Hao Min, Yin-Hai Li, Zhi-Yuan Zhou, Bao-Sen Shi. 2026-06-28. Length-dependent SWIR upconversion spectral response of noncritically phase-matched KTP crystals. https://arxiv.org/abs/2606.10695

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