Judd-Ofelt analysis and mid-infrared emission properties of Ho³⁺-Yb³⁺co-doped tellurite oxy-halide glasses

Abstract

ABCTRACT 2.0μm emission properties of Ho 3+ -Yb 3+ co-doped tellurite oxy-halide glass exited by 980nm LD is reported. Mid-infrared transmittance property of glass was investigated by Fouriertransform infrared (FTIR) spectrometer. The Judd-Ofelt intensity parameters Ω = 2,4,6 , spontaneous radiative transition probabilities, branching ratios and radiative lifetime of Ho 3+ were calculated according to the absorption spectra by using Judd-Ofelt theory. The absorption, emission cross-sections and gain coefficient of Ho 3+ : 5 I 7 → 5 I 8 are calculated based on the McCumber and Reciprocity theories. Results indicate that the maximum 2.0μm emission intensity of Ho 3+ was achieved at 0.15mol% Ho 2 O 3 and 1.5mol% Yb 2 O 3 concentrations in tellurite oxy-halide glass. The maximum absorption and stimulated emission cross-section of Ho 3+ near 1944nm are 6.37 × 10 at 2.0μm and 10.94 × 10 , respectively. The results suggest Ho 3+ -Yb 3+ co-doped tellurite oxy-halide glass is a good candidate for efficient 2.0μm laser.

Advances in Near-Infrared Luminescent Materials without Cr3+: Crystal Structure Design, Luminescence Properties, and Applications

“…216−219 The Judd−Ofelt theory offers intrinsic analysis of the f-f transition. The experimental oscillator strength (f exp ) of the f-f transition is expressed in the following equation: 220,221…”

“…The Judd–Ofelt theory offers intrinsic analysis of the f-f transition. The experimental oscillator strength ( f exp ) of the f-f transition is expressed in the following equation: , where m (0.91093897 × 10 –27 g) and e (4.803242 × 10 –10 esu) are the charge of the electron, c (2.99792458 × 1010 cm/s) is the velocity of light in a vacuum, N (ion/cm 3 ) is the concentration of doped trivalent lanthanide ions, ∫ 0 D (λ) d y is the integrated absorption coefficient that is calculated from the area of absorption peaks. Generally, the experimental oscillator strength includes an electric-dipole contribution and magnetic-dipole contribution that are the defined theoretical oscillator strength ( f cal ).…”

Two micrometer fluorescence emission and energy transfer in Yb3+/Ho3+ co‐doped lead silicate glass

“…[23]. The term U ðtÞ is the reduced matrix element of the tensor operators, which is independent of the host materials.…”

“…The value used in this work for Ho 3+ is quoted from Ref. [23]. The root-meansquare deviation d rms between the measured (f exp ) and the calculated (f cal ) oscillator strengths can be expressed as follows: 24…”