Effect of heating on spectral characteristics of Er-doped laser glasses

Nikolai V. Nikonorov; Alexander K. Przhevuskii; Sergei G. Lunter

doi:10.1117/12.344504

1 April 1999 Effect of heating on spectral characteristics of Er-doped laser glasses

Nikolai V. Nikonorov, Alexander K. Przhevuskii, Sergei G. Lunter

Proceedings Volume 3622, Rare-Earth-Doped Materials and Devices III; (1999) https://doi.org/10.1117/12.344504
Event: Optoelectronics '99 - Integrated Optoelectronic Devices, 1999, San Jose, CA, United States

Abstract

The absorption and fluorescence spectra of Er-doped phosphate and silicate laser glasses were investigated in a temperature range of 20 - 300 degree(s)C. On heating, the differential spectra demonstrated variations of spectral profiles. The effects of heating for silicate and phosphate glasses are similar. The contours of the absorption and luminescence bands varied nonmonotonically with the temperature. These variations were explained by a redistribution of the populations of the Stark sublevels of the ⁴I_15/2 ground and the ⁴I_13/2 excited terms. The heating resulted in 5 - 10% decrease of oscillator strengths of spectral bands. On the base of temperature variations of spectral profiles we proposed an energy levels model, which allowed to explain the thermal variation of spectrum of Er-doped laser at 1.54 micrometers . According to this model, the transitions in two range of lasing (1534 and 1542 nm) come from two Stark sublevels of the ⁴I_13/2 excited manifold to two sublevels of the ⁴I_15/2 ground manifold. The effective energy gaps between neighboring Stark components are equal to 50 cm^-1 and 100 cm^-1 for the ⁴I_13/2 and the ⁴I_15/2 states, respectively.

Citation Download Citation

Nikolai V. Nikonorov, Alexander K. Przhevuskii, and Sergei G. Lunter "Effect of heating on spectral characteristics of Er-doped laser glasses", Proc. SPIE 3622, Rare-Earth-Doped Materials and Devices III, (1 April 1999); https://doi.org/10.1117/12.344504

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