| Original Articles |
|
|
|
|
Utraviolet Lasing from ZnO Single Crystal at Room Temperature
|
| XIANG Wang-Hua1;ZHANG Gui-Zhong1;SUN Yi2;WANG Gang2;John. B. Ketterson2 |
| 1College of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin 300072
2Department of Physics and Astronomy, Northwestern University, Evanston, IL60208 USA |
|
| Cite this article: |
|
XIANG Wang-Hua, ZHANG Gui-Zhong, SUN Yi et al 2003 Chin. Phys. Lett. 20 296-297 |
|
|
|
Abstract We experimentally studied ultraviolet photoluminescence (PL) from ZnO (0001) single crystal at room temperature. The PL spectra taken from the sample edge show spectral width narrowing; lifetime shortening (100 ps) and super linear intensity increase with pumping power, while the PL spectra taken from the sample surface only show broad spontaneous emission with a much longer lifetime ( > 5 ns). These findings suggest that stimulated emission and lasing were only achieved at edges of the ZnO single crystal. Scanning-electron-microscopic images show a smooth sample surface morphology and a rougher morphology at the single crystal edge. Electron-hole plasma enhancement of gain may be attributed to the lasing effect observed from the sample edge.
|
| Keywords:
78.55.-m
42.55.Px
61.50.An
81.05.Ea
|
|
|
Published: 01 February 2003
|
|
|
|
|
|
|
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
