Exploration of Advanced Ceramic Gain Media with Broadband for the Application to High Energy Laser
OSAKA INST OF TECHNOLOGY OHMIYA INFORMATION AND COMMUNICATION ENGINEERING
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Practical laser generation from polycrystalline ceramic materials has become available furthermore, it is expected that ceramic laser technology will completely surpass the conventional glass and single crystal laser technologies in the future. In this work, we fabricated advanced ceramic gain media for broadband such as CLNGG Ca3LixNb1.5-xGa3.5-2xO12, CLNTGG Ca3LiNbTaGa5O12 and YSAG Y3Sc1Al4O12, and investigated their spectroscopic properties such as emission spectrum and fluorescence lifetime. Among them, we screened the best candidate compositions for high energy laser and developed into high optical quality ceramic gain media. Nd doped Y3ScxAl5-xO12 x 0 to 2 ceramics was confirmed as one of the candidates for high energy laser with broadband. A composite structure with three compositions in Nd doped Y3ScxAl5-xO12 x 0 to 2 ceramics was successfully fabricated for the first time to obtain a broadband spectrum. The emission spectrum of multi-layered YSAG composite was more than 5 times broader compared to that of 1at NdYAG. The laser oscillation test showed that multi-layered composite made of NdYSAG ceramics reached laser grade optical quality. Based upon the results of this work, we will apply advanced ceramic materials for high energy laser application in the future.
- Lasers and Masers
- Ceramics, Refractories and Glass