Title :
Development of Low Power Consumption DFB Quantum Cascade Lasers
Author :
Yinghui Liu ; Jinchuan Zhang ; Zhiwei Jia ; Danyang Yao ; Fengqi Liu ; Lijun Wang ; Junqi Liu ; Zhanguo Wang
Author_Institution :
Beijing Key Lab. of Low Dimensional Semicond. Mater. & Devices, Inst. of Semicond., Beijing, China
Abstract :
We report on the development of λ ~ 4.97 μm continuous-wave operation of substrate emitting distributed feedback quantum cascade lasers. A low threshold power consumption of 1.27 W is obtained at 20 °C, along with an ultralow threshold current density of 0.81 kA/cm2 by depositing the high reflection coatings on both facets. Single-lobed far-field radiation pattern with a low divergence angle of about 0.24° × 20.34° is obtained. Reliable single-mode emission with a side-mode suppression ratio about 25 dB is observed among the working temperature range of 10 °C-30 °C.
Keywords :
antireflection coatings; distributed feedback lasers; laser beams; quantum cascade lasers; continuous-wave operation; divergence angle; facets; high reflection coatings; low power consumption DFB quantum cascade lasers; power 1.27 W; side-mode suppression ratio; single-lobed far-field radiation pattern; single-mode emission; substrate emitting distributed feedback quantum cascade laser; temperature 10 degC to 30 degC; ultralow threshold current density; wavelength 4.97 mum; Cavity resonators; Gratings; Heat sinks; Power demand; Quantum cascade lasers; Silicon; Substrates; Semiconductor lasers; distributed feedback devices; quantum cascade lasers;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2015.2463107
