| Rare-earth-doped inorganic crystals and glasses as high gain media for lasers have been well studied during the past several decades.However,the high cost,hard processing and poor heat dispersion for those materials restrict their wide applications. So developing rare-earth-doped organic materials as laser media with low cost,easy processing,high performance and good heat dispersion have become a very important research area.In this paper,two Nd3+-doped organic materials as new laser media with low cost or good heat dispersion have been studied in details.Firstly,based on the advantage of low cost and easy processing for organic materials,Nd3+-doped PMMA buck with high emission cross-section and good laser performance has been studied.The single-crystal structure of Nd(TTA)3(TPPO)2 and thermal behavior of the doped PMMA were analyzed.And we also characterized the UV-Vis,PL and fluorscence decay of the media and discussed the intramolecular energy transfer mechanism of the complex.From the absorption and luminescence spectra,all the physical parameters of Nd3+ were obtained and radiative properties were discussed using Judd-Ofelt theory.All the results indicated that the polymer bulk showed good laser performance.Particularly,the stimulated emission cross-section was 2.75×10-20 cm2 at 1060nm,which is higher than that of other Nd-complex doped organic systems and some inorganic laser glasses,such as LaF3:Nd.Together with the well mechanical properties and easy processing of the polymer,the obtained material is of potential application in low cost and low power rare-earth doped plastic lasers.Secondly,on the basis of good liquidity and heat dispersion for the liquid,which can avoid pyrometric effect in the high power procedure,a novel Nd3+-doped organic liquid material as laser media was designed and studied.The objective was to obtain laser media with high repetition rate and high power.(Nd0.1Y0.9)2O3 nanoparticles were prepared by solution-combustion method and the relationship between particle size and reaction condition was studied.To overcome aggregation and sedimentation and obtain a transparent stable liquid dispersion in DMF,Y2O3:Nd nanoparticles were modified with a silane coupling agent.The obtained liquid medium was characterized by UV-Vis,PL and fluorscence decay.From the absorption and luminescence spectra,the physical parameters were obtained and radiative properties were discussed using Judd-Ofelt theory.The stimulated emission cross-section and fluorescence branching ratio of 4F3/2â†'4I((11/2) transition were 1.73×10-20 cm2 and 0.460,respectively,which can be compared with inorganic laser crystals.In addition,its emission quantum yield was 3.5%which was nearly the same with some Nd3+ doped organic media.All those results indicate obtained medium showed good laser properties.With these advantages,this material has potential applications in the ongoing search for rare-earth doped organic lasers with high repetition and high power. |
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