Laser operation of diode-pumped Er,Yb co-doped YAG ceramics at 1.6 μm

Spectra and diode-pumped continuous-wave 1.55 µm laser of Er:Yb:Ca3NbGa3Si2O14 crystal

The polarized spectra associated with 1.55 µm lasing in an Er:Yb:Ca₃NbGa₃Si₂O₁₄ crystal were investigated at room temperature. The crystal had a large absorption cross section of 3.60 × 10^-20 cm² at 978 nm, long fluorescence lifetime of 5.81 ms for the ⁴I_13/2 multiplet of Er³⁺, and broad emission band at 1.55 µm with full width at half-maximum of 60 nm. End-pumped by a 975 nm diode laser, a 1555 nm continuous-wave microlaser with a maximum output power of 0.4 W and a slope efficiency of 10.6% was demonstrated in a c-cut, 2.5-mm-thick crystal. Combining with natures of the long fluorescence lifetime and the broad emission band, the Er:Yb:Ca₃NbGa₃Si₂O₁₄ crystal with a good thermal performance may be a promising gain medium for high-energy pulse and broadly tunable lasers around 1.55 µm.

Efficient 1620 nm continuous-wave laser operation of Czochralski grown Er:Yb:Lu2Si2O7 crystal

Efficient continuous-wave diode-pumped laser operation of Czochralski grown Er:Yb:Lu₂Si₂O₇ crystal is reported. Polarized absorption and emission spectra, fluorescence lifetimes, and energy transfer efficiency from Yb³⁺ to Er³⁺ were determined. A maximal output power of 522 mW was achieved at 1620 nm with slope efficiency of 15.8% and absorbed pump threshold of 470 mW. Among the Er³⁺ and Yb³⁺ co-doped materials with long fluorescence lifetimes of the upper level ⁴I_13/2, which are candidates for gain media of pulsed laser around 1.55 μm with high energy, comprehensive performance of the Er:Yb:Lu₂Si₂O₇ crystal is the best till now.

Efficient continuous-wave diode-pumped Er3+:Yb3+:LaMgB5O10 laser with sapphire cooling at 1.57 μm

Efficient 1.57 μm continuous-wave laser was demonstrated in an X-cut, 2.0 mm-thick Er³⁺:Yb³⁺:LaMgB₅O₁₀ crystal with sapphire cooling end-pumped by a 976 nm laser diode. In a plano-concave cavity, a laser with a maximum output power of 0.61 W and a slope efficiency of 23% was realized at an absorbed pump power of 4.0 W. A continuous-wave 1566 nm micro-laser with a maximum output power of 0.47 W and a slope efficiency of 16% was also obtained. The lasers were totally linear polarization parallel to the crystalline Z axis. The results show that the Er³⁺:Yb³⁺:LaMgB₅O₁₀ crystal with high thermal conductivity may be a good gain medium for laser around 1.55 μm.

High yield multispectral upconversion emission in Y2Te4O11:Er:Yb nanocrystals on green and NIR excitations

Detailed synthesis, structural, thermal and radiative properties of Er and Er:Yb codoped Y₂Te₄O₁₁ nanocrystals were discussed.

Diode-pumped 1.5-1.6 μm laser operation in Er³⁺ doped YbAl₃(BO₃)₄ microchip

Er3+ doped YbAl3(BO3)4 crystal with large absorption coefficient of 184 cm(-1) at pump wavelength of 976 nm is a promising microchip gain medium of 1.5-1.6 μm laser. End-pumped by a 976 nm diode laser, 1.5-1.6 μm continuous-wave laser with maximum output power of 220 mW and slope efficiency of 8.1% was obtained at incident pump power of 4.54 W in a c-cut 200-μm-thick Er:YbAl3(BO3)4 microchip. When a Co2+:Mg0.4Al2.4O4 crystal was used as the saturable absorber, 1521 nm passively Q-switched pulse laser with about 0.19 μJ energy, 265 ns duration, and 96 kHz repetition rate was realized.

Diode-pumped passively Q-switched Er3+:Yb3+:Sr3Lu2(BO3)4 laser at 1534 nm

End-pumped by a 970 nm diode laser, 1534 nm pulse laser with about 16 μJ energy, 48 ns duration, and 21 kHz repetition rate was obtained at absorbed pump power of 11.8 W in a Z-cut 1.08-mm-thick Er(3+):Yb(3+):Sr(3)Lu(2)(BO(3))(4) crystal passively Q-switched by a Co(2+):Mg(0.4)Al(2.4)O(4) crystal. The effects of absorbed pump power and resonator cavity length on output performances of the pulse laser were investigated. Compared with that of the Er(3+):Yb(3+):LuAl(3)(BO(3))(4) laser in a similar experimental condition, higher pulse energy realized in the Er(3+):Yb(3+):Sr(3)Lu(2)(BO(3))(4) crystal may be originated from its smaller stimulated-emission cross section at 1534 nm and longer fluorescence lifetime of the (4)I(13/2) upper laser level of Er(3+) ions.