Alumino-gallates de sodium-lanthanide de type alumine beta, magnetoplombite ou mixte : cristallochimie, etude spectroscopique et proprietes physiques

SIGLECNRS T Bordereau / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc

Nonlinear optical properties of Ca5(BO3)3F crystal

International audienceA high quality Ca5(BO3)3F (CBF) crystal, grown by flux method, was investigated for its non linear optical properties. This material is non hygroscopic and possesses a moderate birefringence suitable for UV light generation. On the basis of its refractive index dispersion curves, it is inferred that CBF has great potential applications as non linear optical material, notably for UV light generation at 355 and 266nm. In order to characterize its non linear optical properties, CBF samples were first cut and oriented in phase matching conditions for second harmonic generation of 1064nm. Experimental results demonstrate that CBF has the moderate NLO coefficients. The optical conversion efficiency from 1064nm to 532nm was investigated for the first time: up to 54% were achieved. Non linear deff coefficients were also estimated as well as the external angular acceptance bandwidth of SHG at 1064nm

Efficient and tunable continuous-wave diode-pumped Yb3+:Ca4GdO(BO3)3 laser

International audienceA Yb31:Ca4GdO(BO3)3 (Yb:GdCOB) crystal has been diode pumped for the first time to our knowledge. We obtained 47.5% slope efficiency at 6 °C, producing 191 mW of power at 1050 nm, with a 2.4% output coupler. Temperature does not significantly affect the laser performance: At room temperature we still obtained 180mWof power for the same cavity. We achieved tunability of the Yb:GdCOB laser from 1035 to 1088 nm with a 1.7% output coupler and 100-nm tunability with a low-transmission output coupling (T 5 0.03%

Efficient, tunable, zero-line-diode-pumped, continuous-wave Yb3+:Ca4LnO(BO3)3 (Ln=Gd,Y) lasers at room temperature, application to miniature lasers

International audienceWe demonstrate an efficient cw 976-nm-diode-pumped Yb31:Ca4GdO(BO3)3 laser. At room temperature we obtained 814 mW of power with a slope efficiency of 77% and a small-signal gain per round trip of 1.67. We also demonstrate that the Yb31:Ca4LnO(BO3)3 (Ln 5 Gd, Y) crystals are suitable for a plano-plano microchiptype cavity. With this microlaser we have obtained an average power of 300 mW, which corresponds to an optical-optical conversion efficiency of 27