The optimization of near infrared CW Gd3Ga5O12:Nd-,YAIO3:Nd- AND YVO4:Nd- microlasers
The modeling of CW GGG:Nd- (1.4237 mum), YAP:Nd- (1.34 mum), YVO4:Nd-microlasers (1.0643 mum) is carried out. At that for the each fixed value of the incident pumping power and the laser beam divergence the optimal values of the activator concentration, the active medium length and the reflectivity of the output mirror, i.e. the values that maximize the laser power, are determined.
Concentration distribution of Nd3+ In Nd:Gd3Ga5O12 crystals studied by optical absorption method
Nd:Gd3Ga5O12 crystals with different concentrations of Nd3+ were grown by Czochralski method, their absorption spectra were measured at room temperature. By using the optical absorption method, the effective distribution coefficient keff for Nd3+ in GGG was fitted to be 0.40±0.01, which is higher than that of Nd3+ in YAG. The 808nm absorption cross‐section was calculated to be 4.0±0.2×10‐20cm‐2. The lengthways and radial concentration distribution of Nd3+ in the crystals were also analyzed and discussed. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Diode-pumped Yb:GGG laser: comparison with Yb:YAG
Abstract A diode-pumped ytterbium-doped Gd 3 Ga 5 O 12 (Yb:GGG) laser is reported for the first time. We report up to 4.2 W of CW laser power when pumping on the 971 nm absorption band with a 14 W fiber-coupled diode. The easy growth and the high thermal conductivity of Yb:GGG make it a challenger of Yb:YAG for high power applications. The efficiencies of these two crystals have been compared under the same pumping conditions, and turn out to be comparable.