Lasing characteristics of ZnO nanosheet excited by ultraviolet laser beam Lasing characteristics of ZnO nanosheet excited by ultraviolet laser beam

Lasing characteristics of ZnO nanosheet excited by ultraviolet laser beam

Kota Okazaki*, Kazuki Kubo, Tetsuya Shimogaki, Daisuke Nakamura, Mitsuhiro Higashihata,Tatsuo Okada

Graduate School of Information Science and Electrical Engineering, Kyushu University, 744, Motooka, Nishi-ku, Fukuoka 819-0395, Japan

Adv. Mater. Lett., 2011, 2 (5), pp 354-357

DOI: 10.5185/amlett.2011.9093am2011

Publication Date (Web): Apr 08, 2012

E-mail: okazaki@laserlab.ees.kyushu-u.ac.jp

Abstract


The lasing characteristics of ZnO nanosheets were investigated for an application to ultraviolet laser diode. ZnO nanosheets were synthesized on a silicon substrate by a CVD method, and then those ZnO nanosheets were examined by a photoluminescence method with a third-harmonic Nd:YAG laser (355 nm, 5 ns). The observed emission spectra showed the obvious lasing characteristics having mode structure and a threshold for lasing. The threshold power density of a ZnO nanosheet was measured to be 40 kW/cm2, and it would be low enough to be oscillated by an electrical pumping for ultraviolet laser diode.

Keywords

ZnO nanosheet, laser, ultraviolet, photoluminescence

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