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Les oxoborates de calcium et de lanthanide, Ca4LnO(BO3) (Ln=Gd, Y, La) : synthèse et recherche d'angles d'accord de phase non critique pour la conversion de fréquence de longueurs d'onde laser spécifiques

Elisabeth Reino
Abstract : Visible and UV lasers are currently investigated for many applications as data storage, medicine, etc. Intracavity frequency doubling appears as a good solution. Thus, the non-linear family Ca4REO(BO3)3 (RE = rare earth, RECOB) has shown a considerable interest to produce compact visible laser. In addition, it is possible to tune the compositions of RECOB by partial substitutions in order to achieve non-critical phase matching (NCPM). In the present work, various cationic substitutions have been studied in solid solutions as Gd1-xYxCOB, Gd1-xLaxCOB, Gd1-xScxCOB (for the first time), Re1-xBixCOB (REe = Gd or Y) and (Ca1-xSrx)4GdO(BO3)3 in order to investigate their crystal growth and adjust the NCPM wavelength by composition. The wavelength range is related to neodymium doped laser materials emitting on the 4F3/2-4I9/2 transition, for example Nd:YAP (YAlO3) at 930 nm, Nd:YAG (Y3Al5O12) at 946 nm or Nd:ASL (Sr1-xNdyLax-yMgxAl11-xO19) at 900 nm. We have also demonstrated that the compositions for NCPM can be determinated from the refractive index of both lattices M1-xM'xCOB (M, M' = RE) with x = 0 or 1, using the Clausius-Mosotti relation. Two new blue laser systems, constituted of a laser crystal and a non-linear crystal optimized for type-I NCPM second harmonic generation, were achieved: a 946 nm Nd:YAG laser with Gd0.87Y0.13COB and a 900 nm Nd:ASL laser with Gd0.56Y0.44COB. Moreover, we have performed for the first time a CW laser action at 900 nm with Nd:ASL.
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Contributor : Ecole Chimie Paristech <>
Submitted on : Tuesday, February 22, 2005 - 8:00:00 AM
Last modification on : Tuesday, February 22, 2005 - 8:00:00 AM
Long-term archiving on: : Thursday, September 30, 2010 - 6:12:58 PM

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Elisabeth Reino. Les oxoborates de calcium et de lanthanide, Ca4LnO(BO3) (Ln=Gd, Y, La) : synthèse et recherche d'angles d'accord de phase non critique pour la conversion de fréquence de longueurs d'onde laser spécifiques. Chemical Sciences. Chimie ParisTech, 2002. English. ⟨pastel-00001067⟩

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