Intrinsic second‐order nonlinearity in chalcogenide glasses containing HgI2

Frequency conversion using nonlinear optical (NLO) crystals is widely used in advanced photonic technologies to produce coherent light in the spectral regions where the available laser sources are missing. Isotropic glasses usually do not show second order nonlinear processes like second harmonic or...

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Published in:Journal of the American Ceramic Society 2020-05, Vol.103 (5), p.3070-3075
Main Authors: Tverjanovich, Andrey, Borisov, Evgenii N., Kassem, Mohammad, Masselin, Pascal, Fontanari, Daniele, Bychkov, Eugene
Format: Article
Language:English
Subjects:
Anisotropy
Chalcogenides
Coherent light
Gallium sesquisulfide
Glass
Lithium niobates
Nonlinearity
optical materials/properties
Photonic crystals
Single crystals
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container_issue 5
container_start_page 3070
container_title Journal of the American Ceramic Society
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creator Tverjanovich, Andrey
Borisov, Evgenii N.
Kassem, Mohammad
Masselin, Pascal
Fontanari, Daniele
Bychkov, Eugene
description Frequency conversion using nonlinear optical (NLO) crystals is widely used in advanced photonic technologies to produce coherent light in the spectral regions where the available laser sources are missing. Isotropic glasses usually do not show second order nonlinear processes like second harmonic or difference frequency generation (SHG, DFG) except for temporarily induced anisotropy under external stimuli. Here, we show that a HgI2–Ga2S3–GeS2 homogeneous glass exhibits a strong intrinsic SHG response comparable with that of the well‐known NLO single crystal LiNbO3. The origin of this extremely rare phenomenon seems to be noncentrosymmetric bent HgI2 molecules embedded in a sulfide glassy host. Taking into account the unique properties of chalcogenide glasses (wide IR transmission, low phonon density, unlimited ability to be modified changing the appropriate glass properties, fiber drawing and thin layer design), the observed phenomenon opens up the possibility of creating fundamentally new devices for mid‐IR photonics.
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subjects Anisotropy
Chalcogenides
Coherent light
Gallium sesquisulfide
Glass
Lithium niobates
Nonlinearity
optical materials/properties
Photonic crystals
Single crystals
title Intrinsic second‐order nonlinearity in chalcogenide glasses containing HgI2
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