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Journals and Conferences
We demonstrated not only high-efficiency laser generation from polycrystalline Nd:YAG ceramics for the first time, but succeeded in fabrication of high-functional ceramic lasers such as composite, fiber, micro-sphere, and single crystal by sintering method etc.
Resonantly pumped Er(3+):Sc(2)O(3) laser operation is achieved with a quantum defect (QD) of 1.5% at liquid nitrogen temperature. The laser, in-line pumped at 1535 nm, operated at 1558 nm with a slope efficiency of over 45%. This is believed to be the lowest QD eye-safe laser ever reported. CW output of over 3.3 W was obtained in this first experiment.
The thermal-birefringence effect in Nd(3+) -doped YAG ceramics has been investigated. The amount of depolarization induced by thermal birefringence in Nd:YAG ceramics is nearly the same as that in (111)-cut single crystals at the same Nd(3+) concentration. However, depolarization becomes larger as the Nd(3+) concentration increases, even at the same… (More)
We report what is believed to be the first laser operation based on Ho3+-doped Y2O3. The Ho3+:Y2O3 ceramic was resonantly diode-pumped at ~1.93 µm to produce up to 2.5 W of continuous wave (CW) output power at ~2.12 µm. The laser had a slope efficiency of ~35% with respect to absorbed power and a beam propagation factor of M2 ~1.1. We have measured the… (More)
Spatial modulation of a laser beam with a transverse size of the order of one grain size is experimentally found at thermal depolarization in Nd:YAG ceramics. This effect, which was theoretically predicted earlier, is typical for ceramics only, with no analogs either in glasses or in single crystals.
Ceramic composite laser gain media having layer by layer and clad-core structure were fabricated successfully for the first time by advanced ceramic processing. Advanced ceramic technology provides to direct formation of composite having complex structure.
We report the first demonstration of polycrystalline, Nd-doped YAG ceramics with almost perfect pore-free structure and Nd-doped single crystal by advanced ceramic processing. We obtain optical slope efficiencies of 57% with these microchip ceramics lasers.
We have proposed an optical design by tailoring a spectral profile in a ceramic composite of layer-by-layer type Nd:Y<sub>3</sub>Al<sub>5</sub>O<sub>12</sub>/Nd:Y<sub>3</sub>ScAl<sub>4</sub>O<sub>12</sub>. The composite ceramics with enough optical properties to amplify the stimulated emission were fabricated by the sintering method with solid state… (More)
We have developed successfully centimeters long Nd:YAG ceramic fibers by using an advanced ceramic technology. Laser oscillation was performed for the first time with the centimeters long Nd:YAG ceramic fibers.
In this work, we fabricated the all-ceramic composite with layer-by-layer of Nd:Y/sub 3/ScAl/sub 4/O/sub 12/ (YSAG) and Nd:Y/sub 3/Al/sub 5/O/sub 12/ (YAG). We found that the tuning of the pumping wavelength made the spectral profile of fluorescence from the composite ceramics more even than that from single-layered Nd:Y/sub 3/Sc/sub x/Al/sub 5-x/O/sub 12/… (More)