Title :
Quantum Cascade Laser With Unilateral Grating
Author :
Vaitiekus, Deivis ; Revin, Dmitry G. ; Kennedy, Kenneth L. ; Zhang, Shiyong Y. ; Cockburn, John W.
Author_Institution :
Phys. & Astron. Dept., Univ. of Sheffield, Sheffield, UK
Abstract :
We report on distributed feedback quantum cascade lasers at a wavelength of 3.58 μm operating at room temperature. Single-mode emission with a side-mode suppression ratio of 30 dB is achieved by manufacturing single-sided third-order lateral gratings. The devices exhibit watt level peak powers with a threshold current density of ~ 4.3 kA/cm2 at room temperature and remain in single-mode operation over the temperature range of 280-420 K.
Keywords :
current density; diffraction gratings; distributed feedback lasers; laser modes; quantum cascade lasers; distributed feedback quantum cascade lasers; side-mode suppression ratio; single-mode emission; single-mode operation; single-sided third-order lateral gratings; temperature 280 K to 420 K; threshold current density; unilateral grating; watt level peak powers; wavelength 3.58 mum; Distributed feedback devices; Gratings; Laser modes; Quantum cascade lasers; Surface emitting lasers; Temperature distribution; Distributed feedback; lateral grating; quantum cascade laser; single mode; unilateral;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2012.2221274
