Abstract
Prismatic zinc oxide (ZnO) hexagonal microtubes have been fabricated on silicon substrate using vapor transport. Two morphologies, bell-mouthed and uniform hexagonal microtubes, are obtained from the fabrication process. The ZnO hexagonal microtubes have demonstrated ultraviolet (∼393 nm) lasing emission under 355 nm optical excitation. It is found that the threshold pump intensity and cavity mode spacing of the microtube lasers are ∼500kW/cm 2 and ∼0.7 nm, respectively. The lasing characteristics of the microtube lasers are also investigated. It is shown that high threshold pump intensity of the microtube lasers is due to the high radiation loss arising from the hollow hexagonal structure near the prismatic facets.
Original language | English |
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Pages (from-to) | 5273-5278 |
Number of pages | 6 |
Journal | Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers |
Volume | 43 |
Issue number | 8 A |
DOIs | |
Publication status | Published - 1 Aug 2004 |
Externally published | Yes |
Keywords
- Laser resonators
- Lasers
- Ultraviolet emission
- Vapor transport
- Zinc oxide
ASJC Scopus subject areas
- General Engineering
- General Physics and Astronomy