Fiber laser, spontaneous emission light source and optical fiber amplifier

摘要

New fiber lasers, spontaneous emission sources, and optical fiber amplifiers are provided. Their conventional counterparts, which have a fiber doped with thulium (Tm) ions and excited by 0.67 mum or 0.8 mum pumping light, have a problem in that their characteristics are deteriorated with the elapse of time. The new fiber lasers, spontaneous emission sources, and optical fiber amplifiers use 1.2 mum light as pumping light. Alternatively, they use a pumping source for exciting the thulium from the lowest energy level ³H₆ to ³H₅ excitation level. As a more preferable configuration, they improve the emission efficiency at 2.3 mum band by disclosing Tm-doped host glass.