Optical spectra of Tm³⁺‐doped YAl₃(BO₃)₄ single crystals

Abstract

PACS 61.72. Ji, 78.40.Ha, 78.55.Hx Flux grown YAl 3 (BO 3 ) 4 (YAB) crystals doped with Tm 3+ have been characterised by optical spectroscopy techniques. The absorption and emission spectra in the UV-VIS-NIR region have been measured at 10 and 298 K. The visible emission decay profiles have been measured at room temperature. The low temperature spectra have been used to obtain the energy level scheme of the optically active ion in YAB. The Judd-Ofelt parametrization scheme has been applied to the analysis of the room temperature absorption spectra in order to evaluate the intensity parameters, the branching ratios and the radiative lifetimes of the emitting states. These have been compared with the experimental values. Introduction Tm3+ is an attractive laser ion for operation in the visible and NIR regions [1]. Its absorption band at about 800 nm allows pumping by means of commercial laser diodes, making it suitable for the realization of compact solid state laser devices. In this paper we present the results of our investigations on Tm 3+ -doped into YAl 3 (BO 3 ) 4 (YAB), a very promising host crystal for laser ions. In fact it shows good optical, mechanical and thermal properties [2], and its high nonlinear coefficient (d eff = 1.42 pm V

Energy levels and crystal-field analysis of Tm3+ in YAl3(BO3)4 crystals

“…It is evident that in this context the detailed knowledge of the energy levels structure of the emitting center embedded in the host is of fundamental importance. The low temperature spectra of Tm 3 þ -doped YAB were reported by Cavalli et al [12], who evidenced that some of the observed multiplets present a number of features exceeding that expected from the crystal-field splitting of the levels of the active ion. This aspect was successively dealt with by Foldvari et al [13], who proposed an improved energy levels scheme based on temperature and concentration dependent high resolution measurements.…”

“…The observed manifolds have been assigned according to Refs. [12] and [13]. They are shown and commented separately.…”

Thermal and optical properties of Tm3+:SrMoO4 crystal

“…Furthermore, the 3 H 6 → 3 H 4 transition corresponds to the absorption peak at about 800 nm, which is suitable for GaAlAs laser diode pumping [4]. So Tm 3+ -doped materials have been widely investigated, such as Tm-YAG [5], Tm-KGW [6], Tm-YAB [7], Tm-YVO 4 [8], Tm-KY 3 F 10 [9]. Tm-Ca 4 GdO(BO 3 ) 3 [10].…”

Thermal and optical properties of Tm3+: Li6Gd(BO3)3 crystal: A potential candidate for 1.83μm lasers

“…For this level the maximum gain cross-section value is 1.49 Â 10 À21 cm 2 at about 1825 nm. The result at P ¼ 0.60 shows a tuning range of 1700-2000 nm, where the CO 2 and water vapor absorption band exist [24]. The Tm 3+ : Li 6 Gd (BO 3 ) 3 crystal can be used as a tunable laser material.…”