Abstract
In this letter, an Nd3+-doped compound fluorosilicate glass was successfully fabricated with the method of melt-quenching. Under the excitation of a 808 nm laser, enhanced near-infrared photoluminescence emission at the range from 1065 to 1140 nm was observed in the glass sample. To characterize its stability and resistance to environmental effects, transmission spectra at the range of NIR-MIR were measured under different environments, including humidity and temperature. In addition, the obtained fluorosilicate glass was also developed as a microsphere resonator by using CO2 laser heating method. When the diameter of the microsphere was controlled at 61.5 μm, coupling with a tapered fiber, single-multimode lasing in the wavelength range λ1056-1071 nm was achieved with a low lasing threshold of 1.5 mW. Compared to the traditional compound tellurate and fluoride glasses, this fluorosilicate glass has higher transition temperature; means that this resonator can be pumped by higher power. Therefore, using it as the raw material, the developed microsphere resonator offers a high transition temperature and with a low lasing threshold, which are promising it for high performance sensing and detection applications.
Highlights
Optical microcavity refers to a laser resonator with a volume in the order of the light wavelength
Li et al achieved 2.0 μm lasing from a Tm3+ doped silica glass microsphere pumped by a 808 nm laser (Li et al, 2018)
As the content of Nd3+ continues to increase, the cross relaxation between Nd3+ ions becomes more and more significant and radiation-free transitions are more likely to occur due to the proximity between Nd3+ ions. This fluorosilicate glass had a phase-separated structure, and dopants were predominantly located in the F-rich area (Wang et al, 2018), that is why the concentration quenching value was as low as 0.8 mol%
Summary
Optical microcavity refers to a laser resonator with a volume in the order of the light wavelength. The first laser emission from rare-earth doped glass microsphere resonators was reported by Miura et al (1997). Li et al achieved 2.0 μm lasing from a Tm3+ doped silica glass microsphere pumped by a 808 nm laser (Li et al, 2018). Compound glasses exhibit interesting properties, such as high transmittance and low phonon energy. Fluoride glasses were widely applied in upconversion and MIR emission due to their low phonon energy. In 2000, von Klitzing demonstrated a green upconversion laser emission in an Er3+-doped fluoride glass microsphere (von Klitzing et al, 2000). Compared to silica and compound glasses, this fluorosilicate glass has both low phonon energy (Wang et al, 2018) and great stability, which is a potential material for micro-nano photonics.
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