Lasing of ZnO Micro / Nanocrystals by Ultraviolet Laser Excitation and Atmospheric Alignment with Laser-induced Motions and Electrical Field
| Autor: | Kota Okazaki, Tetsuya Shimogaki, Tatsuo Okada, Mitsuhiro Higashihata, Daisuke Nakamura |
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| Rok vydání: | 2012 |
| Předmět: |
Materials science
Laser diode business.industry Chemical vapor deposition Laser medicine.disease_cause Industrial and Manufacturing Engineering law.invention Gain-switching law Excited state medicine Optoelectronics Electrical and Electronic Engineering business Instrumentation Lasing threshold Excitation Ultraviolet |
| Zdroj: | Journal of Laser Micro/Nanoengineering. 7:264-268 |
| ISSN: | 1880-0688 |
| Popis: | Lasing characteristics and an alignment method of ZnO micro / nanocrystals were investigated for an application to ultraviolet (UV) laser diode (LD). A single ZnO microsheet synthesized by carbothermal chemical vapor deposition method was examined by spectra observation with a thirdharmonic Nd:YAG laser (λ = 355 nm, τ = 5 ns) as an excitation laser light. The observed emission spectra showed the lasing characteristics having mode structure and a threshold for lasing at 49 kW/cm 2 . In addition, laser-induced motions (LIM) of ZnO micro / nanocrystals at high excitation intensity beyond the lasing threshold were observed when those were excited by the UV laser beam at a repetition rate of 20 Hz. The mechanism of the LIM was discussed, and an alignment method of ZnO micro / nanocrystals using the LIM and electrical fields was demonstrated. |
| Databáze: | OpenAIRE |
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