Near infrared broadband and visible upconversion emissions of erbium ions in oxyfluoride glasses for optical amplifier applications

• Published in: Optics and laser technology Vol. 127; p. 106167
• Main Authors: Kummara, Venkata Krishnaiah, Neelima, G., Ravi, N., Nanda Kumar Reddy, Nallabala, Satish Kumar Reddy, H., Dwaraka Viswanath, C.S., Lenine, D., Surekha, G., Padma Suvarna, R., Yuvaraj, C., Venkatramu, V.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01-07-2020; Elsevier BV
• Subjects: Barium fluorides; Broadband; Chemical composition; Decay curves; Emission; Erbium; Erbium ions; Erbium oxide; Excitation; Fluorescence; Glass; Ion concentration; Lasers; Lasers and amplifiers; Optical band gap; Optical gain bandwidth; Optical properties; Oxyfluorides; Oxyfluoro-phosphate glasses; Phosphorus pentoxide; Semiconductor lasers; Stimulated emission; Titanium dioxide; Upconversion; Decay curves; Optical band gap; Optical gain bandwidth; Erbium ions; Oxyfluoro-phosphate glasses; Lasers and amplifiers
• ISSN: 0030-3992; 1879-2545
• DOI: 10.1016/j.optlastec.2020.106167

Gain cross-section spectra of Er3+-doped PCfBfTiEr20 glass for the 4I13/2 → 4I15/2 transition.
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•Erbium (Er3+)-doped oxyfluoride (PCfBfTiEr) glasses have been synthesized.•Judd-Ofelt (JO) phenomenological intensity parameters (Ω2, Ω4, Ω6) have been estimated.•Intense eye-safe emission at 1534 nm has been obtained under 980 nm laser excitation.•High emission cross-section and bandwidth product were obtained for PCfBfTiEr2.0 glass.
Optical and visible upconversion properties of erbium (Er3+)-doped oxyfluoro-titania-phosphate glasses (PCfBfTiEr) with the chemical composition of P2O5–CaF2–BaF2–TiO2–Er2O3 have been explored. An intense emission at 1.53 µm of Er3+-doped PCfBfTiEr1.0 glass was obtained upon excitation of 980 nm diode laser. In addition, green and red visible upconversion emissions were obtained upon the optical excitation of Er3+ ions doped PCfBfTiEr glasses at 980 nm diode laser. Upconversion emission intensities and population densities of respective levels were tuned with the variation of Er3+ ion concentration. Fluorescence decay curves of the 4I13/2 level of PCfBfTiEr glasses were obtained upon 980 nm laser excitation in the pulsed mode and revealed a mono-exponential behavior. The stimulated emission cross-section (σem), full width at half maximum (FWHM) and gain bandwidth product (σem × FWHM) were found to be 9.3 × 10−21 cm2, 95.61 nm and 889.2 cm−2 nm for PCfBfTiEr2.0 glass, respectively. These results recommend that the Er3+ ions doped PCfBfTiEr glasses may possibly be worthy for the laser and optical amplification applications at 1.53 µm.