Erbium-Ion-Doped Bismuth Borate Glasses for High Optical Gain NIR Fiber Laser Applications

Author:

Prasanth M.,Ravi NirlakallaORCID,Thyagarajan K.

Abstract

The study focused on investigating the thermal, structural, and luminescent properties of bismuth borate glasses doped with erbium (Er3+) ions and modified with Gd2O3, K2O, and Li2O (BBGKL: Erx) aiming for fiber lasers. Two glass transition temperatures were observed at 381 (Tg1) and 471 K (Tg2) for BBGKL glass. O1s de-convolution spectrum bridging oxygens for BBGKL glass, including B-O, Bi-O, Li2O, and K2O, were discovered by XPS. Both the photoluminescence (PL) 4I13/24I15/2 NIR and the absorption bands from the UV-visible-NIR spectrum were found to occur at 1531 nm for BBGKL: Er. The luminescence quenching was not noticed up to 3.0 mol% of Er3+ ion concentration. The BBGKL: Er0.5 glass has a remarkable connection between its absorbance and emission cross-sections of 0.77 and 0.82 × 10−20 cm2, respectively. The longest lifetime of green emission for the 4S3/24I15/2 transition was found for BBGKL: Er2.0 glass at 10.6 μs and 1531 nm NIR emission for the 4I13/24I15/2 transition of BBGKL: Er0.5 glass was 0.77 ms. In the 1413–1728 nm NIR band region for BBGKL:Er3.0, high optical gain cross-section G(λ) was promising for the population inversion at γ = 0.6. These findings suggested that the BBGKL: Er0.5 glass would prove helpful in NIR fiber laser applications.

Publisher

The Electrochemical Society

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