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

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• 作者：Song Tan (1) (2)
  Jinchuan Zhang (1)
  Lijun Wang (1)
  Fengqi Liu (1)
  Ning Zhuo (1)
  Fangliang Yan (1)
  Junqi Liu (1)
  Zhanguo Wang (1)
  
• 关键词：Sampled Bragg grating ; Distributed feedback ; Quantum cascade laser ; Wide wavelength range
• 刊名：Optical and Quantum Electronics
• 出版年：2014
• 出版时间：December 2014
• 年：2014
• 卷：46
• 期：12
• 页码：1539-1546
• 全文大小：1,068 KB
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• 作者单位：Song Tan (1) (2)
  Jinchuan Zhang (1)
  Lijun Wang (1)
  Fengqi Liu (1)
  Ning Zhuo (1)
  Fangliang Yan (1)
  Junqi Liu (1)
  Zhanguo Wang (1)
  
  1. Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing聽, 100083, China
  2. Department of Physics, Tsinghua University, Haidian District, Beijing聽, 100084, China
  
• ISSN：1572-817X

文摘

Single-mode, wide wavelength range, high output power and low threshold current density DFB QCLs emitting around 4.7聽 \(\upmu \) 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聽dB was obtained. A wide wavelength range of 238聽nm ( \(\sim \) 106聽cm \(^{-1}\) ) 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聽kA/cm \(^{2}\) , and output power from a single facet in the range from 666.7 to 944.4聽mW at 293聽K.