Efficient diode-pumped Nd:KGd(WO4)2 laser grown by top nucleated floating crystal method

Polarized spectroscopic properties of Nd3+-doped KGd(WO4)2 single crystal

“…Otherwise, it is worth noting that the FWHM around 810 nm for the EJN p is broader (7 nm) though the absorption cross section is smaller. So, if its absorption coefficient is improved by increasing the dopant concentration (up to 10 at% presently [12]) or a thicker crystal is used, the polarization for the EJN p may be an alternative pump direction for diode-pumped laser operation. The difference of FWHM of the absorption line around 810 nm at room temperature for the EJN m polarization between this work and other reports (about 12 nm) [8,14] may be caused by the different crystal growth methods and dopant concentrations (1.9 at% in this work compared to 3 at% in Ref.…”

“…For the Nd 3+ :KGW crystal, the absorption cross sections for direct pump wavelength at 882 nm are favorable and the maximum absorption cross section is 9.95 Â 10 À20 cm 2 for the EJN m while the FWHM is larger than 2 nm. So, with the increase of the Nd 3+ concentration in the KGW crystal, the microchip laser performances of the Nd 3+ :KGW crystal may be improved by pumping at 882 nm, especially taking its weak concentration quenching effect into account [12].…”

“…The unit cell parameters of the KGW crystal are: a ¼ 10.652(4) Å ; b ¼ 10.374(6) Å ; c ¼ 7.582(2) Å ; b ¼ 130.80(2) Å , with Z ¼ 4 and space group C2/c [9]. The spectroscopic properties and laser potential of some rare earth ions doped KGW crystals have already been reported in the literature, which have demonstrated that they are attractive multifunctional laser media [4][5][6][7][8][9][10][11][12][13][14][15]. However, to the best of our knowledge, no detailed and complete information has been given about the polarized spectroscopic properties of the Nd 3+ -doped KGW crystals, which are important for evaluating its laser performances, designing its best laser operating conditions and comparing with other Nd 3+ laser crystals.…”

Experimental study on pulse characteristics of diode-pumped Q-switched Nd:KGW laser

“…6c shows the results of purely passive Q-switching, the pulse width was about 65.6 ns and the repetition rate 16.5 kHz. The pulse width of passive Q-switching was shorter than the 180 ns in [12]. As can be seen from Fig.…”

Crystal growth and characterization of KY(WO4)2 and KGd(WO4)2 for laser applications

“…The color of the crystals is light violet and deep violet for 1% and 3% Nd concentrations, respectively. KYW and KGW single crystals were successfully grown by Boulon et al [8] through top nucleating floating crystal method, Pujol et al [9] by the conventional top seeded method and Demidovich et al [10] by modified Czochralski method. The shape of the growing crystal decides the quality of the crystal.…”