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RISS 인기검색어
- 검색키워드
- 저자 : Slivken, S. (검색결과 3 건)
- 무료
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유재수,Slivken, S.,Razeghi, M. 경희대학교 레이저공학연구소 2006 레이저공학 Vol.17 No.-
We have investigated the characteristics of quantum cascade lasers operating at λ∼6.5 ㎛. Using a high-reflectivity coating, the peak output power of 925 mW and the average power of 150 mW were obtained. From 298 K to 393 K, the characteristic temperature was 195 K. The laser operated up to 220 K in continuous-wave mode.
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Yu, J S,Slivken, S,Razeghi, M Institute of Physics 2010 Semiconductor science and technology Vol.25 No.12
<P>We report the continuous-wave (CW) operation of InGaAs/InAlAs quantum cascade lasers (QCLs) operating at λ ∼ 7.3 µm above room temperature. The injector doping level-dependent CW characteristics above room temperature are investigated for doping densities between 7 × 10<SUP>16</SUP> cm<SUP>−3</SUP> and 2 × 10<SUP>17</SUP> cm<SUP>−3</SUP>. The device performance, i.e. threshold current density, output power, operating temperature and characteristic temperature, depends strongly on the injector doping density. For a relatively low injector doping density of 7 × 10<SUP>16</SUP> cm<SUP>−3</SUP>, a high-reflectivity-coated 10 µm wide and 4 mm long laser exhibits an improved device performance with an output power of 152 mW and a threshold current density of 1.37 kA cm<SUP>−2</SUP> at 298 K under CW mode, operating up to 343 K. The thermal characteristics are also analyzed by the estimation from the experimentally measured data for the QCLs with different injector doping densities.</P>
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High Power Quantum Cascade Lasers Operating at Room Temperature
M. Razeghi,S. Slivken 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.III
In this paper, some key design and technology issues for development of high power quantum cascade lasers are discussed. The scaling of power output with the number of emitting stages is shown. As part of this work, high power, 75-stage, $\lambda$ = 9 $\mu$m lasers have been demonstrated with a peak power of 7 W at room temperature. This power is a direct result of high quality material growth and a low loss waveguide design. Similar results are demonstrated at a shorter wavelength ($\lambda$ = 6.1 $\mu$m) utilizing a strain-balanced active region/injector design. For a 30-stage structure, 2 W peak power and 250 mW average power have been demonstrated at room temperature. Lastly, a timeline comparison of QCL laser performance is presented in terms of room temperature threshold current density and peak output power for various groups.
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