Spectroscopic properties and 1.5–1.6 μm laser operation of Er:Yb:YSr3(PO4)3 crystal

Preparation and systematic spectra analysis of YPO4 crystal co-doped with Er3+ and Yb3+

Continuous-wave and passively Q-switched pulse Er:Yb:Ca3NbGa3Si2O14 microlasers at 1.5–1.6 μm

An Er:Yb:Ba 3 Gd(PO 4 ) 3 crystal was grown by the Czochralski method. Spectral properties of the crystal associated with 1.5–1.6 µm laser operation were investigated, including the absorption and fluorescence spectra and the fluorescence decay at room temperature. The fluorescence quantum efficiency of the 4 I 13/2 level of Er 3+ ions and energy transfer efficiency from Yb 3+ to Er 3+ ions were calculated. A CW diode-pumped Er:Yb:Ba 3 Gd(PO 4 ) 3 laser at 1.5–1.6 µm with output power of about 73.9 mW and slope efficiency of 16.3% was achieved for the first time in the Er 3+ /Yb 3+ co-doped phosphate crystal. 

Spectral and laser properties of Er:Yb:Ba₃Gd(PO₄)₃ crystal at 1.5-1.6 m

Eye-safe 1.5–1.6 μm pulse laser passively Q-switched by a Co2+:MgAl2O4 crystal was realized in a Z-cut, 1.8 mm-thick Er:Yb:Sr3Gd2(BO3)4 crystal end-pumped by a 935 nm laser diode. A 1534 nm pulse laser with energy of 9.1 μJ, repetition frequency of 15.6 kHz, and duration of 29 ns was obtained at an absorbed pump power of 2.5 W. Polarization of the output laser beam was measured to be linear and parallel to the Y optical indicatrix axis. Benefited from a broad and flat absorption band between 920 and 950 nm, the Er:Yb:Sr3Gd2(BO3)4 crystal may be a good gain medium for 1.5–1.6 μm laser pumped by a common commercial diode laser around 940 nm.

935 nm-diode-pumped passively Q-switched Er:Yb:Sr3Gd2(BO3)4 pulse laser at 1.5–1.6 μm

An eye-safe 1.55 μm solid-state pulse laser with high repetition frequency is useful for some applications such as lidar. A high-repetition-frequency self-Q-switched 1.55 μm pulse laser was firstly demonstrated in an Er:Yb:Lu2Si2O7 crystal end-pumped by a continuous-wave 975 nm diode laser. The influences of various cavity parameters on the self-Q-switched pulse laser performance were investigated. At an absorbed pump power of 6.3 W and a pump beam diameter of 400 μm, a self-Q-switched 1.55 μm pulse laser with energy of 3.37 μJ, repetition frequency of 43 kHz, and duration of 1.04 μs was realized. When the pump beam diameter was changed to 100 μm, the repetition frequency and duration of the pulse laser increased to 230 kHz and decreased to 236 ns, respectively, while the pulse energy reduced to 1.22 μJ.

Jianhua Huang

Papers

Spectroscopic properties and 1.5–1.6 μm laser operation of Er:Yb:YSr3(PO4)3 crystal

935 nm-diode-pumped passively Q-switched Er:Yb:Sr3Gd2(BO3)4 pulse laser at 1.5–1.6 μm

Eye-safe 1.55 μm high-repetition-frequency self-Q-switched Er:Yb:Lu2Si2O7 pulse laser