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题名: High power continuous-wave operation of self-organized In(Ga)As/GaAs quantum dot lasers
作者: Wang ZG;  Liang JB;  Qian G;  Xu B
出版日期: 1999
会议日期: 36337
摘要: Quantum dot (QD) lasers are expected to have superior properties over conventional quantum well lasers due to a delta-function like density of states resulting from three dimensional quantum confinements. QD lasers can only be realized till significant improvements in uniformity of QDs with free of defects and increasing QD density as well in recent years. In this paper, we first briefly give a review on the techniques for preparing QDs, and emphasis on strain induced self-organized quantum dot growth. Secondly, self-organized In(Ga)As/GaAs, InAlAs/GaAlAs and InAs/InAlAs Qds grown on both GaAs and InP substrates with different orientations by using MBE and the Stranski-Krastanow (SK) growth mode at our labs are presented. Under optimizing the growth conditions such as growth temperature, V/III ratio, the amount of InAs, InxGa1-xAs, InxAl1-xAs coverage, the composition x etc., controlling the thickness of the strained layers, for example, just slightly larger than the critical thickness and choosing the substrate orientation or patterned substrates as well, the sheet density of ODs can reach as high as 10(11) cm(-2), and the dot size distribution is controlled to be less than 10% (see Fig. 1). Those are very important to obtain the lower threshold current density (J(th)) of the QD Laser. How to improve the dot lateral ordering and the dot vertical alignment for realizing lasing from the ground states of the QDs and further reducing the Jth Of the QD lasers are also described in detail. Thirdly based on the optimization of the band engineering design for QD laser and the structure geometry and growth conditions of QDs, a 1W continuous-wave (cw) laser operation of a single composite sheet or vertically coupled In(Ga)As quantum dots in a GaAs matrix (see Fig. 2) and a larger than 10W semiconductor laser module consisted nineteen QD laser diodes are demonstrated. The lifetime of the QD laser with an emitting wavelength around 960nm and 0.613W cw operation at room temperature is over than 3000 hrs, at this point the output power was only reduced to 0.83db. This is the best result as we know at moment. Finally the future trends and perspectives of the QD laser are also discussed.
会议名称: 1999 IEEE Hong Kong Electron Devices Meeting (HKEDM 99)
会议文集: 1999 IEEE HONG KONG ELECTRON DEVICES MEETING, PROCEEDINGS
专题: 中国科学院半导体研究所(2009年前)_会议论文

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推荐引用方式:
Wang ZG; Liang JB; Qian G; Xu B .High power continuous-wave operation of self-organized In(Ga)As/GaAs quantum dot lasers .见:IEEE .1999 IEEE HONG KONG ELECTRON DEVICES MEETING, PROCEEDINGS,345 E 47TH ST, NEW YORK, NY 10017 USA ,1999,2-3
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