Tightly focused NIR femtosecond laser irradiation in MgO:LN generates a photovoltaic-driven space-charge field that forms lens-shaped refractive-index modifications around laser-induced microtracks and domains; these lenses disappear on annealing due to bulk screening while domains persist.
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Up-conversion detection converts mid-IR CO absorption to visible band for cavity-free in-situ sensing, reaching 79.6 ppb sensitivity over 0.14 m path with silicon detector and single-photon level detection via SPAD.
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Formation of photoinduced space-charge field during in-bulk domain creation by femtosecond NIR laser irradiation in MgO:LN crystals
Tightly focused NIR femtosecond laser irradiation in MgO:LN generates a photovoltaic-driven space-charge field that forms lens-shaped refractive-index modifications around laser-induced microtracks and domains; these lenses disappear on annealing due to bulk screening while domains persist.
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Mid-infrared high-sensitive cavity-free in-situ CO gas sensing based on up-conversion detection
Up-conversion detection converts mid-IR CO absorption to visible band for cavity-free in-situ sensing, reaching 79.6 ppb sensitivity over 0.14 m path with silicon detector and single-photon level detection via SPAD.