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Optical properties of Yb:Y3Sc2Al3O12 crystal were investigated and compared with those from Yb:YAG crystals. Laser-diode pumped continuous-wave and passively Q-switched Yb:Y3Sc2Al3O12 lasers with Cr4+:YAG crystal as saturable absorber has been demonstrated for the first time.
The oscillation of Yb fiber laser with radial polarization is demonstrated. A converging Brewster axicon is used as the radial-polarization mode selector. So far, 39-mW output power is obtained at 460-mW launched pump power with 13.8% slope efficiency.
The photoconductivity of high Yb-concentration YAG and Y2O3 samples has been measured, confirming the occurrence of up-conversion in these materials. High intensity pumping reveals a very broad emission spectrum that exhibits avalanche behaviour.
A diode-pumped Q-switched laser oscillator with a liquid-nitrogen-cooled Yb:YAG ceramics active mirror has been demonstrated. 7.5-mJ pulse energy and 30-W average power were obtained. The maximum optical and slope efficiency were 62% and 71%, respectively.
Nd:Y2O3 ceramic materials have been synthesized using the vacuum sintering technique with the raw materials prepared by the nanocrystalline methods. The TEM measurements reveal the excellent optical quality of the ceramic with low pore volume and narrow grain boundary. The radiative spectral properties of Nd:Y2O 3 ceramic have been evaluated by fitting the Judd-Ofelt model with the absorption and...
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