12 May 2006 Spectroscopic properties and laser operation of RE3+-ion doped garnet materials
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Abstract
There has been considerable interest in the trivalent rare earth-ion-doped ceramic laser materials because of its numerous advantages over melt growth methods, including faster production times, solid solution allowing the fabrication of multi-phase transition materials, highly homogeneous materials and the ability to engineer profiles and structures before sintering. Much progress has been made in improving the optical quality from ceramics, as well as exploring new materials. Successfully developed concentrated Nd:YAG ceramics was opened the way for drastic heat reduction by directly upper laser level pumping. In this present, after the spectroscopic investigation of rare-earth doped garnet materials includes ceramics, we report about the heat generation properties with the radiative quantum efficiency. Lately developed RE3+-ion-doped disordered laser ceramic materials, Y3ScxAl5-xO12, which are a solid solution of YAG and Y3Sc2Al3O12 (YSAG), have been interested in because of its compositional tuning of parameter x. The disordered Y3ScAl4O12 (YAG/YSAG) ceramics exhibit relatively low minimum pump intensity (Imin) and broad emission bandwidth. The value of Imin in the Yb:Y3ScAl4O12 ceramics was found to be 2/3 compared with the Yb:YAG single crystal under 970nm zero-line pumping. Efficient laser oscillation of 72% slope efficiency was obtained for input power. Next, we have demonstrated passively mode-locked Yb:Y3ScAl4O12 disordered ceramic laser by using a semiconductor saturable-absorber mirror. Pulses as short as 280 fs having an average power of 62 mW at 1035.8 nm was obtained. As a conclusion, the possibility of tailored fluorescence spectral profile in layer-by-layer type ceramic composite will be discussed.
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Takunori Taira, Yoichi Sato, Jiro Saikawa, Akio Ikesue, "Spectroscopic properties and laser operation of RE3+-ion doped garnet materials", Proc. SPIE 6216, Laser Source and System Technology for Defense and Security II, 62160J (12 May 2006); doi: 10.1117/12.668220; https://doi.org/10.1117/12.668220
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