Near-infrared imaging via upconversion in Er3+:CaF2 crystal with dual wavelength excitation
Yugo Akabe,
Keito Shinohara,
Marilou Cadatal-Raduban
et al.
Abstract:We propose a system for imaging 1510 nm near-infrared (NIR) wavelength via upconversion (UC) luminescence in an Er3+-doped CaF2 crystal. Er3+ ions are excited from the ground to the excited state levels by an 800-nm pre-excitation wavelength, followed by the promotion of these ions to a higher energy level by the NIR excitation wavelength. Relaxation of these excited ions gives rise to 540 nm UC luminescence in the visible region, enabling the detection of the 1510 nm NIR wavelength. Using this UC scheme, 1510… Show more
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