Patra, Pritha and Gangareddy, Jagannath and K. , Jayanthi and Chakraborty, Saswata and Keshri, Shweta R. and Bysakh, Sandip and Krishnan, N. M. Anoop and Soma, Venugopal Rao and Kalyandurg, Annapurna (2024) Reverse Polarizability of Rare Earth Ions (La3+, Gd3+, Lu3+, Y3+) in Tellurite Glasses and Glass Ceramics for Optical Limiting. ACS Applied Optical Materials, 2 (11). pp. 2262-2276. ISSN 27719855

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Abstract

All-optical modulation using inherent third-order optical nonlinearity of a medium has garnered considerable interest in photonics and optoelectronics. Herein, nonlinear optical (NLO) properties of tellurite glasses and glass ceramics (GCs) containing four different rare earths (RE = La, Gd, Lu, and Y) have been deliberated in near-infrared regions under an ultrafast regime. The La-based glass exhibits ∼10 times higher nonlinear refraction (n2) and absorption (α2) than reported NLO materials. The NLO susceptibility [χ(3)] trend in the studied glasses is La > Gd > Lu > Y, matching with RE3+ polarizability. Furthermore, Ln2Te6O15 nanocrystallite-embedded transparent GCs exhibit a larger NLO coefficient due to the enhanced local field from oxygen vacancies in crystallites. Interestingly, the trend of χ(3) in GCs follows the sequence of Y > Lu > Gd > La, precisely opposite to the glasses. This observation challenges the general polarizability approach of RE3+ ions, emphasizing that quadratic hyperpolarizability of RE3+ is pivotal for NLO properties of GCs. Among the studied matrices, Y-containing GCs showed the lowest optical limiting (OL) threshold (5.4 mJ/cm2 at 800 nm), much lower than those of the reported NLO materials, suggesting its potential as a femtosecond NIR-laser safety material. A combination of large α2 and n2 from the studied matrices indicates their advantage for harmonic generation, potentially aiding in the design of ultrafast signal processing devices.

Item Type:	Article
Subjects:	Glass > Glass Chemistry Glass
Divisions:	Glass
Depositing User:	Ms Upasana Sahu
Date Deposited:	01 Sep 2025 11:31
Last Modified:	01 Sep 2025 11:31
URI:	http://cgcri.csircentral.net/id/eprint/5784

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