We present the diode pumping of a Nd-doped strontium and lanthanum (Nd:ASL) crystal Sr1-xLax-yNdyMgxAl12-xO19 (0.05 ≤ x ≤ 0.5; y = 0.05) for second harmonic generation around 450 nm. In order to fulfill the pumping requirements of this
crystal, we have developed a high-brightness pump source based on a tapered amplifier in an extended cavity with a
volume Bragg grating for wavelength stabilization. A pump brightness of 110 MW.cm-2sr-1 has been obtained with a
linewidth lower than 80 pm at 798 nm. This laser source has been used to pump a Nd:ASL crystal to obtain 300 mW at
906 nm and 53 mW at 453 nm by intracavity doubling with a LBO crystal.
Nd-doped strontium and lanthanum (ASL) crystals Sr1-xLax-yNdyMgxAl12-xO19 (0.05 ≤ x ≤ 0.5; y = 0.05) were grown by Czochralski pulling technique. Up to 1.67W of 900nm IR output laser power for an absorbed power of 2.53W was obtained under Ti:sapphire pumping at 792nm. Intracavity second harmonic generation experiments led to 320mW of blue laser power at 450nm with a 10mm-long BiB3O6 nonlinear crystal. Other nonlinear crystals were also evaluated such as LBO.
The study of neodymium ions emission along the channel 4F3/2->4I9/2 led us to select several materials for short laser wavelength application. The results obtained with three series of compounds are presented: ABGa3O7 (A = Ca or Sr-B = La or Gd), ABAlO4 (A = Ca or Sr-B = Y, Ln) and AMO4 (A= Ca, Sr or Ba-M = Mo or W). Crystal growth of these hosts and neodymium ions spectroscopic characterizations are presented. Among all these crystals, Nd-doped BaWO4 seems to be the most promising one for laser emission at short wavelength, combining easy crystal growth, short emission wavelength and long lifetime.
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