Preparation, Structure, and Spectroscopic Properties of Nd(3+): (La(1-x) Lu(x)) 3(Lu(1-y)Ga(y)) 2(Ga)3 O12 Crystals
Abstract
Single crystals of lanthanum lutetium gallium garnet (LLGG) were grown by the Czochralski pulling technique. X-ray diffraction and elemental analysis performed on these samples indicate that these garnets do not form with simple stoichiometry described as (La) 3Lu2(Ga)3O12 but with increased Lu concentration in the dodecahedral site and Ga occupancy in the octahedral site. Optical absorption and fluorescence spectra confirm these results, showing inhomogeneous broadening of the spectral lines of Nd3+. Various laser gain measurements were performed on (La1-xLux) 3Lu1-yGay2(Ga)3O12 crystals containing 4.3 and 1.2 atomic percent Nd3+ to determine the usefulness of this material as a laser. No optical gain was observed. To ascertain why, time-resolved, site- selection spectroscopy measurements were made to determine the effects of ion/ion interaction, and two-photon excitation spectroscopy measurements were made to determine the effects of excited state absorption. The results show the presence of very weak energy transfer between ions in nonequivalent crystal-field sites and the presence of very strong two-photon absorption transitions. Keywords: Neodymium, Crystal field theory, Rare earth, Spectra.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1988
- Accession Number
- ADA198476
Entities
People
- Dhiraj K. Sardar
- Gregory J. Quarles
- Richard C. Powell
- Susan A. Stewart
- Toomas H. Allik
Organizations
- Harry Diamond Laboratories