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New Vanadium Acid Lutetium Gadolinium Doped Mirror Series Of Crystal Growth, Characterization And Laser Performance

Posted on:2007-03-13Degree:MasterType:Thesis
Country:ChinaCandidate:Y ChengFull Text:PDF
GTID:2208360185982548Subject:Materials science
Abstract/Summary:PDF Full Text Request
High power laser diode pump solid-state lasers(DPSSL) advance rapidly due to the development of high power laser diode(LD) and optimizing design of DPSSL since the 80th of 20 century. Because it combines semiconductor with solid, the DPSSL possess the merits of both semiconductor and solid. DPSSL have been found important applications in the fields of material processing, optical communications, control and guide, laser measurement, laser medical treatment, laser chemistry and laser nuclear fusion. It is a very pivotal factor for the DPSSL to search for laser materials that are suitable for LD pumping, therefore, the upsurge for exploring new laser crystal materials is rising.Nd3+-doped laser crystal materials are investigated widely. Nd3+-doped vanadates laser crystal such as Nd:YVO4, Nd:GdVO4, Nd:LuVO4 have higher absorption coefficient, larger emission cross section and wider absorption band. Those excellent optical and laser properties make them applied widely in middle and small lasers. Nd:YVO4 crystal has been commercial, which is one of laser medium with a wide variety of applications. The conductivity of Nd:GdVO4 (11.7W/m·K) is comparable to that of YAG. Thus, Nd:GdVO4 crystal is potential high power LD pumping laser material.Among all kinds of Rare-earth ions, Yb3+ is another doped ion which has been researched widely. As a 4f13 ion, Yb3+ is a very simply energy level structure. The electronic structure of ytterbium has only two states, namely the ground state (F7/2) and the excited state (F5/2), This simple electronic structure of Yb3+ ion make it possess such spectroscopic advantages as no excited-state absorption, no up-conversation and negligible nonradiative relaxation rate between the two states. And most of the crystals with high concentration of Yb3+ ions have no luminescence quenching, but the concentration of Yb3+ ions in crystals can be so very high that the laser devices can be powerful compact. The ways of exciting Yb3+ ions are either directly by using the InGaAs diode-lasers emitting in the 900-1000nm regions, or by energy transfer from excited Nd3+ ions, which have been studied in many matrices The Nd-Yb system has two advantages that they usually have a far higher absorption coefficient and they can be pumped by the AlGaAs diode-lasers which are more convenient and powerful than InGaAs diode-lasers. In 1993, Stuttgart university demonstrate the foreground that Yb3+ are optimization active ion for high power oxide...
Keywords/Search Tags:Yb:LuVO4 crystal, Yb3+:GdxLu1-xVO4 crystal, crystal growth, thermal properties, optical properties, laser properties
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