Index-coupled multi-wavelength distributed feedback quantum cascade lasers based on sampled gratings

被引:3
作者
Tan, Song [1 ,2 ]
Zhang, Jinchuan [1 ]
Wang, Lijun [1 ]
Liu, Fengqi [1 ]
Zhuo, Ning [1 ]
Yan, Fangliang [1 ]
Liu, Junqi [1 ]
Wang, Zhanguo [1 ]
机构
[1] Chinese Acad Sci, Inst Semicond, Key Lab Semicond Mat Sci, Beijing 100083, Peoples R China
[2] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China
基金
中国国家自然科学基金;
关键词
Sampled Bragg grating; Distributed feedback; Quantum cascade laser; Wide wavelength range; CONTINUOUS-WAVE; SPECTROSCOPY;
D O I
10.1007/s11082-013-9868-9
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Single-mode, wide wavelength range, high output power and low threshold current density DFB QCLs emitting around 4.7 m were presented. The multi-wavelength lasers were fabricated simultaneously on a single wafer by different sampled gratings. Instead of electron beam lithography, conventional holographic exposure combined with the optical photolithography was used to fabricate the sampled grating. Single-mode lasing at different wavelengths with a mean side mode suppression ratio above 20 dB was obtained. A wide wavelength range of 238 nm (106 cm) was achieved in pulsed mode at room temperature with different sampling periods. All the DFB-QCLs showed a stable single-mode operation with threshold current density in the range from 1.067 to 1.3 kA/cm, and output power from a single facet in the range from 666.7 to 944.4 mW at 293 K.
引用
收藏
页码:1539 / 1546
页数:8
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