Growth and optical characterization of a new stoichiometric monoclinic laser crystal KYb(WO/sub 4/)/sub 2/

Polarized spectroscopic characterization and energy transfer of Tm3+-, Ho3+-BaLaGa3O7: new promising 2.0 µm laser crystals

“…Fluorescence decay curves for the 3 F 4 → 3 H 6 (Tm 3+ ) and 5 I 7 → 5 I 8 (Ho 3+ ) are shown in figures 3 and 4. In order to reduce the effect of radiation trapping on the measurement [22], the lifetime measurement was carried out with a fine powdered [23] Tm 3+ , Ho 3+ -BaLaGa 3 O 7 crystal immersed in liquid methylsilicone, which was used to provide refractive index matching to avoid total internal reflection so as to minimize the reabsorption in the particles. The fluorescence lifetimes τ f of 3 F 4 (Tm 3+ ) are 4.35 ms and 3.17 ms in the Tm 3+ -BLGO and Tm 3+ /Ho 3+ -BLGO crystal, respectively.…”

Thermal expansion of monoclinic KYbxY1-x(WO4)2 laser crystals

“…In addition, the Stokes shift between pump and lasing wavelengths (laser quantum defect) for these Yb-doped crystals is very small, ~5% [8], which determines the low heat dissipation in the laser active medium. These properties of KYb x Y 1-x (WO 4 ) 2 crystals allow to obtain high generation e ciencies in different lasing modes (cw, Qswitching, mode locking, regenerative ampli cation, planar waveguide lasers [9][10][11][12][13]) as well as high output power and pulse duration ~100 fs under direct diode pumping in passive mode-locked lasers using SESAM.…”

Giant optical gain in rare-earth-ion-doped thin films and waveguides

“…Furthermore, the active ions are incorporated in lattice sites with large ion separation, permitting larger dopant concentrations without introducing significant spectroscopic quenching effects [9]. Very large dopant concentrations, reaching the stoichiometric composition [10] KYb(WO 4 ) 2 , can be incorporated in these materials. Combination with a long excited-state lifetime, tight pump and signal light confinement, and excellent pump-mode overlap with the active region allows us to achieve extremely large excitation densities.…”