Raman Scattering and Nd$^{3+}$ Laser Operation in NaLa(WO$_{4}$)$_{2}$

Abstract

Abstract-The continuous-wave laser operation of Nd-doped tetragonal NaLa(WO 4 ) 2 crystal is studied at room temperature by optical pumping in the spectral region overlapping AlGaAs diode laser emission. This crystal has inhomogenously broadened optical bands. From the room-temperature spectroscopic parameters determined it is found that the optimum Nd concentration for the 4 3 2 4 laser channels must be in the 3-5 at.% range. For = 11 2 and 13 2 channels ( 1 06 and 1.3 m) the most favourable polarization configuration is parallel to the crystallographic axis, while for = 9 2 little polarization dependence of the laser efficiency is predicted. Laser operation was achieved with a 3.35 at.% Nd-doped sample grown by the Czochralski method. The laser operation was tested in an hemispherical optical cavity pumped by a Ti:sapphire laser. Stimulated emission at = 1056 nm was achieved for a wide spectral pumping range, = 790-820 nm. Stimulated Raman scattering was achieved in the picosecond regime with an efficiency similar to that of monoclinic KY(WO 4 ) 2 reference compound.

Growth and characterization of single crystal fibers of Nd3+:NaLa(WO4)2

“…The average concentrations in the fibers are summarized in the table 4. The absorption spectrum (figure 9) showed absorption bands of the neodymium trivalent cation (Nd 3+ ) in the NLW host (in the single-crystalline fiber shape) in accordance with data already reported at literature for bulk crystals [4]. All of the observed transitions were identified.…”

“…Stimulated emission has been obtained with this ion incorporated in at least 100 different host materials, and a higher power level has been obtained from Nd lasers than from any other four-level material [2]. Recent spectroscopic studies of Nd 3+ :NaLa(WO 4 ) 2 crystals have shown high luminescent quantum efficiency, moderate emission cross-section and FWHM large emission in the 1.06 and 1.35µm regions, making this material a promising active host for tunable solid state laser [3][4].…”

Hydrothermal synthesis, multicolor tunable luminescence and energy transfer of Eu3+ or/and Tb3+ activated NaY(WO4)2 nanophosphors

“…Tungstates are well-known classical self-activated luminescence materials, which can effectively absorb ultraviolet (UV) and X-ray, then simultaneously migrate the absorbed energy to the doped rare-earth ions through energy transfer, and give their characteristic emissions. Therefore, they are recently considered as promising host materials for rare-earth luminescent centers because of the special properties of WO 4 2-& Guixia Liu liuguixia22@163.com group [11][12][13][14]. From the report of Huang et al [15], it was seen that tungstate host essentially showed a little weaker blue emission at room temperature compared to the absorption in excitation spectrum, owing to efficient energy transfer from WO 4 2-group to activators.…”

Spectroscopy of tetragonal Eu:NaGd(WO4)2 crystal

“…In particular, efficient laser operation with Nd 3þ [6], Yb 3þ [7,8], Tm 3þ [9,10] and Ho 3þ ions [11] has been reported. These materials have an important advantage as compared with their monoclinic counterparts where Na þ is replaced by K þ , i.e.…”