Polarization stable vertical-cavity surface-emitting laser with surface sub-wavelength gratings

被引：7
|
作者：
Li Shuo [1 ]
Guan Bao-Lu [1 ]
Shi Guo-Zhu [1 ]
Guo Xia [1 ]
机构：
[1] Beijing Univ Technol, Photon Device Res Lab, Beijing 100124, Peoples R China
来源：
ACTA PHYSICA SINICA | 2012年 / 61卷 / 18期
基金：
中国国家自然科学基金;
关键词：
vertical-cavity surface-smiting laser; sub-wavelength gratings; polarization stability; VCSELS;
D O I：
10.7498/aps.61.184208
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
By introducing sub-wavelength grating into an oxide-confined 980-nm vertical-cavity surface-emitting laser (VCSEL), the VCSEL with a stable polarization is realized. A sub-wavelength zero-order grating period is smaller than the wavelength in the semiconductor medium. This choice avoids a reduction in efficiency due to higher diffracting light. After the grating is etched, the threshold gains of E-fields parallel and perpendicular to the grating groves direction are different. The polarization therefore would be controlled. Good laser characteristics are obtained: the orthogonal polarization suppression ratio is over 12 dB and the threshold current increases just 7.14%.
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页数：6
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