| Presentation | 1998/9/17 Homogeneity evaluation of optical-grade LiTaO_3 single crystals by line-focus-beam acoustic microscopy Tadashi Okuzawa, Jun-ichi Kushibiki, |
|---|---|
| PDF Download Page | PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | In this paper, line-focus-beam acoustic microscopy is applied to characterization of optical-grade LiTaO_3 single crystals. First of all, to evaluate crystal homogeneity quantitatively, the relationships (calibration lines) among leaky surface acoustic wave (LSAW) velocities, chemical compositions, Curie temperatures, densities, and lattice constants are investigated by using four kinds of crystals grown with the different compositions of starting materials of 48.0, 48.5, 49.0 Li_2Omol%, and congruent composition. In this investigation, it is shown that LSAW velocity propagating along Y axis on Z-cut substrate varies most sensitively with the chemical composition, with the rate of 0.032 Li_2Omol%/(m/s). Next, homogeneity of each crystal is evaluated by using the calibration lines obtained, and changes of the chemical compositions in the crystals have been successfully detected as the variations of LSAW velocities, due to the variations of the crystal growth conditions. A commercially available optical-grade crystal with congruent composition has a slight inhomogeneity of 0.45 m/s in LSAW velocity along pulling axis, which corresponds to variation of 0.015mol% in Li_2O concentration. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | optical-grade LiTaO_3 single crystal / line-focus-beam acoustic microscopy / leaky surface acoustic wave / material characterization / chemical composition / calibration line |
| Paper # | US98-46 |
| Date of Issue |
| Conference Information | |
| Committee | US |
|---|---|
| Conference Date | 1998/9/17(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Chair | |
| Vice Chair | |
| Secretary | |
| Assistant | |
| Paper Information | |
| Registration To | Ultrasonics (US) |
|---|---|
| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Homogeneity evaluation of optical-grade LiTaO_3 single crystals by line-focus-beam acoustic microscopy |
| Sub Title (in English) | |
| Keyword(1) | optical-grade LiTaO_3 single crystal |
| Keyword(2) | line-focus-beam acoustic microscopy |
| Keyword(3) | leaky surface acoustic wave |
| Keyword(4) | material characterization |
| Keyword(5) | chemical composition |
| Keyword(6) | calibration line |
| 1st Author's Name | Tadashi Okuzawa |
| 1st Author's Affiliation | Department of Electrical Engineering, Faculty of Engineering, Tohoku University() |
| 2nd Author's Name | Jun-ichi Kushibiki |
| 2nd Author's Affiliation | Department of Electrical Engineering, Faculty of Engineering, Tohoku University |
| Date | 1998/9/17 |
| Paper # | US98-46 |
| Volume (vol) | vol.98 |
| Number (no) | 270 |
| Page | pp.pp.- |
| #Pages | 8 |
| Date of Issue | |