With a laser-diode (LD) as the pump source, continuous-wave (cw) laser performance at 1.33 µm of Nd:CNGG and Nd:CLNGG crystals was demonstrated for the first time. The maximum power of 158 mW and 141 mW from Nd:CNGG and Nd:CLNGG lasers were obtained with the corresponding optical conversion efficiencies of 1.3% and 1.5%, and slope efficiencies of 2.0% and 2.9%, respectively. The difference between the laser performance of Nd:CNGG and Nd:CLNGG crystals was also discussed.Intensity, a.u.

Laser-diode pumped continuous-wave (cw) laser performance of a new class Nd:LuxGd1-xVO4 crystals at 1.34 μm was demonstrated for the first time to our knowledge. A maximum output power of 2.25 W was obtained at the incident pump power of 11.96 W with x = 0.14, giving the corresponding optical conversion efficiency of 18.8%. Efficient emission cross-sections of the mixed crystals were calculated for different x. The influence of Lu composition x on the variations of laser performance and emission cross-section was also discussed.

We report on the first observation of stimulated Raman scattering (SRS) effects in tetragonal crystals of SrGdGa 3 O 7 and SrLaGa 3 O 7, known as host crystals for Ln 3+ -lasant ions. All recorded Raman-induced spectral lines were identified and attributed to the promoting χ (3) -vibrational modes of these gallates. Steady-state Raman gain coefficients for first Stokes generation were estimated. A short review of known simultaneous SRS-and Ln 3+ -laser active melilite-type crystals is given as well.

This letter presents the results of stimulated Raman scattering (SRS) spectroscopy of tetragonal Y 0.4 Gd 0.6 VO 4 vanadate crystals having a partly disordered zircon-type structure. Picosecond laser pumping revealed previously unexplored χ (3) -nonlinear interactions comprising the generation of an almost two-octave spanning Stokes and anti-Stokes frequency comb, self-third harmonic generation as well as cross-cascaded processes involving four different Raman-active modes. The recorded spectral lines have been assigned to the participating molecular vibrational modes of the (VO 4 ) 3− structural units of the studied crystal. In addition, this work provides a brief review of all known SRS-active tetragonal and monoclinic vanadates of the form REVO 4 including their χ (3) -nonlinear properties and steadystate Raman gain coefficients for first Stokes generation.Keywords: stimulated Raman scattering (SRS), partly disordered tetragonal vanadate, Y 0.4 Gd 0.6 VO 4 , Raman crystal, zircon-type crystal, stokes and anti-stokes frequency comb, cross-cascaded nonlinear optical effects, many-phonon SRS, Raman frequency converter

Measurements for photorefractive dynamic properties under polarized light with different luminous intensity and wavelength at 650 nm were performed in calcium-doped strontium barium niobate crystals as a function of the time. Experimental results further validated that the different input luminous intensities influence only the saturated time and photorefractive velocity of the photorefractive crystals. Birefringence experiments suggest that an input luminous intensity oscillatory threshold should exist between 64 mW/cm(2) and 13 mW/cm(2). The dynamic change of refractive index from self-focusing to asymmetric self-defocusing was also measured and regarded as the mutual results of the nonuniform-intensity incidence and positive thermal lens effect, which was validated by a further experiment based on the Michelson interference. Also, oscillation accompanying change in the dynamic indices was analyzed and attributed to the high dielectric effect as well as asymmetric self-defocusing in this investigation.