2.7 μm emission properties of Er3+/Yb3+/Eu3+: SrGdGa3O7 and Er3+/Yb3+/Ho3+: SrGdGa3O7 crystals

Optical and Judd‐Ofelt spectroscopic study of Er3+‐doped strontium gadolinium gallium garnet single‐crystal

“…Second, lower phonon energy decreases multi‐phonon relaxation non‐radiative rate and results in enhancement of up‐conversion fluorescence intensity of doped rare‐earth ions. Third, the 4 I 11/2 (980 nm) manifold of Er 3+ active ions in the crystal has a longer lifetime (~0.7 milliseconds) . The longer lifetime of the manifold not only favours the 980‐nm‐upconverted emissions but also makes it possible to realize Er 3+ laser operation at 2.7 μm mid‐infrared wavelength region .…”

“…Third, the 4 I 11/2 (980 nm) manifold of Er 3+ active ions in the crystal has a longer lifetime (~0.7 milliseconds) . The longer lifetime of the manifold not only favours the 980‐nm‐upconverted emissions but also makes it possible to realize Er 3+ laser operation at 2.7 μm mid‐infrared wavelength region . Besides the Er 3+ dopant, the optical and spectroscopic properties of the Melilite type ABC 3 O 7 single‐crystals doped with other rare‐earth ions, such as Nd 3+ , Ho 3+ , Tm 3+ , Tb 3+ , Eu 3+ , have been also investigated …”

Highly efficient tunable multi-wavelength laser properties of Er3+,Yb3+,Pr3+ triple-doped BaLaGa3O7 crystal at ∼2.7 μm

“…Compared with the absorption of Er:BLGO, there is a much wider and stronger absorption band centered at 980 nm in Er/Yb:BLGO and Er/Yb/Pr:BLGO crystals owing to the overlapping absorption transition: 2 F 7/2 → 2 F 5/2 of Yb 3+ and 4 I 15/2 → 4 I 11/2 of Er 3+ . 9,10 The absorption cross-sections with peaks at 980 nm for Er 3+ ,Yb 3+ ,Pr 3+ :BLGO crystals were calculated 18 and are listed in Table 1. The absorption cross-section of Er/Yb/Pr:BLGO crystals is much larger as compared to other ABGa 3 O 7 crystals.…”

Investigation of Y2.1Er0.9(ScxGa1−x)5O12 Matrix Components on the Spectral Properties around 3.0 μm by Micro-Pulling-Down Method

“…Furthermore, Er 3+ -doped garnet crystals have tremendous potential in the mid-infrared field, because they have good thermal performance and high optical quality in this region. Among several Er 3+ -doped garnet crystals, Er:YSGG shows a lower pumping threshold and higher conversion efficiency [7][8][9][10][11][12]. In this work, our goal is to grow a series of 30% Er 3+ :Y 3 (Sc x Ga 1−x ) 5 O 12 crystals, and to explore how the proportion of Sc 3+ /Ga 3+ in the fibers can affect the fluorescence characteristics, and especially the emission wavelength at around~3.0 µm.…”