Nonlinear Optical Properties of Isomorphic Family of Crystals with Yttrium‐Aluminium Borate (YAB) Structure

Abstract

The second harmonics generation of Nd-laser radiation (A = 1.06 microns) of the isomorphic family of crystals with yttrium-aluminium borate (YAB) structure -RAI, (BO,), (R = Y, Sm, Eu, Gd, Dy, Er, Ho, Tu) -investigated using the powdor method and the theoretical calculation of SHG-coefficients -are reported. The rcfraction indices (for I = 5481 A) and optical sign for all studied YAB-typo crystals are determined with the help of the immersion method. All studied crystals possess PM direction and oee-interaction. The SH-intensity is of KDP order of magnitude, with reasonable correlation of experimental and theoretical data. Theoretical analysis of the contributions of different ions t o the integral d;: magnitude has shown identical signs for all ion species in YAB structure type.Es wird uber die Erzeugung der zweiten Harmonisehen dcr Nd-Laser-Strahlung (1, = 1,06 pm) der isomorphen Kristallreihe mit Yttrium-Aluminium-Borat-Struktur -RAl,(BO,), (R = Y, Sm, Eu, Gd, Dy, Er, Ho, Tu) -die nach der Pulvermethode und mit Hilfe der theoretisohen Berechnung der Koeffizienten der 2. Harmonischen untersucht wurden, berichtet. It was reported by BALLMAN (1962a) on flux growing and preliminary investigations of some crystals with yttrium-aluminium borate (YAB) structure -RA13(B03)4 whereR = Y, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Yb. The structure of this isomorphic family is similar to the structure of the carbonate mineral huntite (CaMg,(CO,),). From the whole group more details are known for the YALJBO,),: space group R 32; cell parameters: a = 9.287 A, C = 7.256 A ; optically negative; no = 1.775, n, = 1.715; density 3.70 g c 1 r 3 ; Mohs hardness 7.5. All investigated crystals showed piezoelectric activity (BALL-MANN 1962b), and it was predicted by REZ the possibility of considerable optical nonlinearity. Now we report on the investigation of second harmonics generation (SHG) of Nd-laser radiation, fulfilled on powders and tiny crystals and theoretical calculation of SHG-coefficients.Tiny crystals of the studied family were grown in the flux in the temperature range 1150-850 "C with potassium trirnolybdate as solvent (LEONYUK et al.)

Visible range optical absorption of Er 3+ ions in yttrium aluminum borate (YAB) crystals

“…Favorable physical parameters, like as the broad absorption range (down to 200 nm), large nonlinear optical coefficients, and proper refractive index dispersion for phase matching imply its detailed investigation [1]. Its huntite crystal structure (trigonal, R32), allows homogeneous, high concentration doping by rare-earth ions.…”

Optical second harmonic generation in Yttrium Aluminum Borate single crystals (theoretical simulation and experiment)

“…YAB is a non centro-symmetric crystal and as early as in 1974 it was reported to be a very effective second-harmonic generating material [3]. Furthermore, owing to its good chemical stability and possibility of substituting Y 3+ ions with other lanthanide ions, namely Nd 3+ , Yb…”

Microscopic studies on imperfections in selected YAB single crystals

“…They are suitable host materials for doping with rare-earth and other ions. The doped YAB crystals have favorable laser optical properties and they seem to be perspective for polyfunctional laser applications [1][2][3][4][5]. These applications demand high quality single crystals and intensive study is needed to reveal the reason of random as-grown imperfections that often cause quality reductions of crystals.…”