Optical Study of SrLaGaO₄and SrLaGa₃O₇Doped with Nd³⁺and Yb³⁺

Abstract

Single crystals of SrLaeaO 4 and SrLaGa3O7 singly doped with Nd and codoped with Nd and Yb have been grown by the Czochralski method.Both the compounds form tetragonal crystals but belong to different space groups. A common feature of these matrices is a structural disorder resulting from statistical distribution of Sr"' and Lai+ ions over the lattice sites. A previous investigation of a laser diode pumped SrLaGa3O7:Nd laser revealed that inhomogeneous broadening of spectral lues of Nd 3 + was advantageous for optical pumping and did not influence adversely the extraction efficiency. The present paper deals mainly with optical properties of Yb 3+ ions which are of interest for the design of lasers pumped by a diode laser and operating near 1 /m.

Upconversion-induced ultraviolet emission in Ho3+ doped SrLaGa3O7 and SrLaGaO4 crystals

“…Whereas, the optical and laser properties of Nd 3+ , Pr 3+ , Er 3+ , Eu 3+ , Dy 3+ , Tm 3+ doped SrLaGa 3 O 7 [2,[5][6][7][8] and Nd 3+ , Eu 3+ , Yb 3+ doped SrLaGaO 4 [3,4] have been reported, the spectroscopic data on Ho 3+ doped SLG and SLO crystals have not been, to our knowledge, presented. Holmium ion has been chosen as a dopant because it shows laser action at different wavelengths, from 550 nm to 3.9 m, in a variety of hosts [9] and offers various upconversion mechanisms [10][11][12][13] which may be enhanced in SLG and SLO system because of their structural properties.…”

“…The crystal structure is built from CO 4 layers formed in the ab plane. Between the layers the divalent A cations and trivalent B cations are distributed randomly in eight coordinated sites with C s symmetry [2,3]. SrLaGaO 4 belongs to the large family of compounds of general chemical formula ABCO 4 where A = Ca, Sr, Ba; B = Y, La-Gd; C = Al, Ga. SLO crystallises in the perovskite phase with tetragonal K 2 NiF 4 structure having space group I4/mmm.…”

“…The crystal is built from CO 6 layers formed in the ab plane. Between the layers the A and B cations are distributed randomly in nine coordinated sites with C 4v symmetry [3].…”

“…The principal interest in studying rare earth doped SrLaGa 3 O 7 (SLG) and SrLaGaO 4 (SLO) crystals is due to their structural disorder and resulting strong inhomogeneous broadening of the optical transitions and due to the ability of this matrix to accept high concentrations of activator [1][2][3][4]. Whereas, the optical and laser properties of Nd 3+ , Pr 3+ , Er 3+ , Eu 3+ , Dy 3+ , Tm 3+ doped SrLaGa 3 O 7 [2,[5][6][7][8] and Nd 3+ , Eu 3+ , Yb 3+ doped SrLaGaO 4 [3,4] have been reported, the spectroscopic data on Ho 3+ doped SLG and SLO crystals have not been, to our knowledge, presented.…”

Synthesis and luminescent properties of nanoparticles GdCaAl3O7:RE3+ (RE=Eu, Tb) via the sol–gel method

“…GdCaAl 3 O 7 is one of the complex oxides in the rareearth calcium aluminate family with a general chemical formula ABC 3 O 7 (A ¼ Ca, Sr, Ba; B ¼ La, Gd, Y; C ¼ Al, Ga) belongs to the large families that have melilite structure. Structural investigations indicate that they form tetragonal crystals with space group P42 1 m. The crystal structure is built up from layers of AlO 4 5À tetrahedral and between the layers the Ca 2+ and Gd 3+ ions are distributed randomly in site of Cs symmetry [16,17].…”