Title :
Suppression of Random Lasing Modes in Polycrystalline ZnO Thin-Film by Using Distributed Bragg Reflector
Author :
Tsang, Siu H. ; Yu, Siu F. ; Lau, Shu P. ; Yang, Hui Y. ; Li, Xiao Feng
Author_Institution :
Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore
fDate :
4/15/2009 12:00:00 AM
Abstract :
Formation of vertical-cavity random laser by using a polycrystalline ZnO thin-film optically coupled to 11.5 pairs of Al2O3-ZnO multilayer distributed Bragg reflector (DBR) is proposed. Lasing characteristics of the laser observed from the surface of the polycrystalline ZnO thin film are studied without and with the presence of DBR. It is found that the corresponding spectral linewidth can be limited to about 4 nm at high excitation intensity under the influence of DBR.
Keywords :
II-VI semiconductors; aluminium compounds; distributed Bragg reflector lasers; laser beams; semiconductor lasers; spectral line breadth; zinc compounds; Al2O3-ZnO; multilayer distributed Bragg reflector; polycrystalline thin-film; random lasing modes; spectral linewidth; vertical-cavity random laser; Distributed Bragg reflectors; Laser excitation; Laser modes; Nonhomogeneous media; Optical coupling; Optical films; Surface emitting lasers; Transistors; Vertical cavity surface emitting lasers; Zinc oxide; Distributed Bragg reflectors (DBRs); random laser; zinc oxide;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2009.2014647
