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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