Rare Earth Ions Doped Violet And Ultraviolet Upconversion Laser Materials And Laser Manipulation Of A Bubble

In recent years, short-wavelength solid-state lasers in the ultraviolet to green spectral range have attracted much attention due to a wide range of applications including high-density optical data storage, all color displays, undersea communications, biomedicine and infrared sensors. The phenomenon of frequency upconversion by using the intrinsic energy level matching of certain-rare-earth ions, as one of the available approaches exploring short-wavelength solid-state lasers, has been investigated widely during the past two decades.Up to now, short-wavelength upconversion solid-state lasers in the visible region have been obtained. Ultraviolet and violet upconversion solid-state lasers are the next objective of the researchers. For the realization of ultraviolet and violet upconversion solid-state lasers, the maximal obstacle is the search of ultraviolet and violet upconversion laser materials. In this thesis, we try to solve this obstacle.We prepared amorphous Zn0.3 Al0.25 Pbo.3 Li0.098 Ybo.i Tmo.002 F2.354 and Zn0.3 Al0.25 Pbo.3 Li0.09 Ybo.i Er0.01 F2.37 materials by pulsed laser deposition, investigated the origins of enhancement of ultraviolet and violet upconversion and built the relations between ultraviolet (or violet) upconversion and the Judd-Ofelt parameters. In addition, ultraviolet and blue upconversion stimulated emissions from Zn0.3 Alo.25 Pb0.3 Li0.098 Yb0.1 Tm0.002 F2.354 powder were observed. These results showed the relations between UV (or violet) upconversion luminescence and the Judd-Ofeltparameters, and presented a way to obtain infrared-to-violet and ultraviolet upconversion laser materials.In addition, we realized laser manipulation of a bubble produced - by a short-pulsed laser. CW infrared laser not only precluded the collapsing of the bubble produced by a nanosecond laser but also blew it up, which was attributed the liquid-vapor phase transition induced by Marangbni effect. We believed that laser manipulation of a bubble might present a way to control the dynamic process of the bubble and clarify the origin of single-bubble luminescence.- Especially, the liquid-to-vapor phase transition of a micro system (such as a vapor bubble) could be studied by using our method.