1996 Fiscal Year Final Research Report Summary
CHARACTERIZATION OF VISIBLE,TUNABLE SOLID STATE LASER MATERIALS
| Project/Area Number |
07650049
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Applied optics/Quantum optical engineering
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| Research Institution | GIFU UNIVERSITY |
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Principal Investigator |
YAMAGA Mitsuo GIFU UNIVERSITY,FACULTY OF GENERAL EDUCATION,PROFESSOR, 教養部, 教授 (90159202)
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| Project Period (FY) |
1995 – 1996
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| Keywords | SOLID STATE LASER / TUNABLE LASER / TRANSITION METAL IONS / RARE-EARTH IONS / OXIDES / DISORDER / TITANIUM IONS / CHROMIUM IONS |
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| Research Abstract |
Transition metal ions Cr^<3+>, Ti^<3+> and rare earth ions Ce^<3+> in crystals are used as laser active ions. Since electron-phonon couplings of their ground and excited state electrons are quite different, the optical transitions feature broad absorption and emission bands, giving rise to a wide tuning range of laser oscillation. Recently, the demonstrations of optically pumped solid-state tunable lasers obtained from Cr^<3+> : LiCaAlF_6, Ti^<3+> : Al_2O_3, and Ce^<3+> : LiYF_4 crystals at room temperature were reported. In order to obtain new tunable solid state laser materials, we have examined the electronic properties of Cr^<3+>, Ti^<3+>, Ce^<3+> : CaYAlO_4 (CYA) using electron spin resonance (ESR) and optical spectroscopy.
ESR studies of Cr^<3+> in CYA show Cr^<3+> ions in sites with ordered and disordered configurations of the second nearest-neighbor Ca^<2+>/Y^<3+> ions, respectively. The polarized intensities of the ^4A_2-^4T_2 absorption band and the R_1-line fluorescence suggest that the CrO_6^<9-> octahedra undergo an angular distortion such that the magnetic z-axis of the spectrum is rotated away from the crystal c-axis.
The g tensor of Ce^<3+> in CYA was obtained to be g_<11>=2.6, g_*=1.6. The ESR results indicate that the wavefunction of the ground state of Ce^<3+> in CYA has a dominant component of |J,J_Z>=|5/2,5/2>. The absorption of Ce^<3+> in CYA was observed in the UV region (200-370nm) and the luminescence band has a peak at 490nm.
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