Optical injection probing of single ZnO tetrapod lasers
The properties of zinc oxide (ZnO) nanotetrapod lasers are characterized by a novel ultrafast two-color pump/stimulated emission probe technique. Single legs of tetrapod species are isolated by a microscope objective, pumped by 267 nm pulses, and subjected to a time-delayed 400 nm optical injection pulse, which permits investigation of the ultrafast carrier dynamics in the nanosize materials. With the optical injection pulse included, a large increase in the stimulated emission at 400 nm occurs, which partially depletes the carriers at this wavelength and competes with the normal 390 nm lasing. At the 390 nm lasing wavelengths, the optical injection causes a decrease in the stimulated emission due to the energetic redistribution of the excited carrier depletion, which occurs considerably within the time scale of the subpicosecond duration of the injection pulse. The effects of the optical injection on the spectral gain are employed to probe the lasing dynamics, which shows that the full width at half maximum of the lasing time is 3 ps.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Director. Office of Science. Office of Basic Energy Sciences. Materials Science and Engineering Division; National Science Foundation Contracts ECS-0210106 and ECS-0204340; Korea Science and Engineering Foundation (US)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 838075
- Report Number(s):
- LBNL-56642; R&D Project: 400101; TRN: US200507%%304
- Journal Information:
- Chemical Physics Letters, Vol. 404, Issue 1-3; Other Information: Submitted to Chemical Physics Letters: Volume 404, No.1-3; Journal Publication Date: 03/07/2005; PBD: 23 Nov 2004
- Country of Publication:
- United States
- Language:
- English
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