| 摘要 |
An upconversion active gain medium including a crystal host doped with two groups of active ions capable of producing either blue or ultraviolet lasing radiation at room temperature from single band infrared pumping radiation that is continuous or quasi-continuous is disclosed. An upconversion micro-laser incorporating a chip of said upconversion active gain medium, an optical cavity for resonating at least said lasing radiation and a small size pumping source is disclosed too. The pumping radiation energy is applied to the crystal host by means of a beam or a set of beams of said pumping radiation to be absorbed by sensitizer ions and provide the energy transfer to the activator ions. The crystal host is made of a new class of materials the composition thereof being arranged to be compatible with the preferable upconversion mechanism for increasing efficiency and providing stability and reproducibility of the micro-laser parameters. Said crystal host may be arranged to produce said lasing radiation at one of the wavelengths preferably using additionally a red or an infrared exciting radiation having been produced also by said crystal host itself during the upconversion process. Besides, a structure of the crystal host may be arranged to produce said lasing radiation being polarized. |
