Laser properties of the diode-pumped Nd~(3+)-doped La_2CaB10O19 crystal

摘要

We have determined the angular distribution of the fluorescence at 1051 nm wavelength of the Nd~(3+)-doped monoclinic La_2CaB_(10)O_(19) crystal, originating from Nd~(3+) ions located in the regular La~(3+) sites, for extraordinary polarization in the XZ principal plane. We have found that the highest emission intensity does not occurs the Z-axis direction but in a -7.1° around the Y=b-axis rotated direction. With a one-pump cavity we obtained simultaneous lasing at 1051 and 1069 nm in X and Z-polarizations from Nd~(3+) ions located in La~(3+) and Ca_(2+) sites, respectively. In the active Q-switch regime the two laser pulses are always simultaneous. With a two-pump setup based on an optical bifurcated fiber we obtained also simultaneous lasing at 1051 and 1069 nm. The relative power of the two laser channels is tuneable with the help of a beam-splitter. An adequate value of the relative pump power of the two channels leads to simultaneous pulses in the active Q-switch regime.