Title :
Dependence of threshold current and linearity on Bragg wavelength for grating-surface-emitting lasers
Author :
Kjellberg, Torgil ; Hagberg, Mats ; Eriksson, Niklas ; Larsson, Anders G.
Author_Institution :
Dept. of Optoelectron. & Electr. Meas., Chalmers Univ. of Technol., Goteborg, Sweden
Abstract :
We report on a systematic experimental study of the dependence of the threshold current and power-current linearity on the detuning of the Bragg wavelength from the gain peak for grating-surface-emitting lasers. Minimum threshold currents were obtained for lasers emitting at wavelengths 2 to 9 nm on the long wavelength side of the gain peak, depending on the cavity length. Threshold currents as low as 98 A/cm/sup 2/ were obtained at the optimum Bragg wavelength. A strong dependence of the linearity on the detuning was found and the lasers showed good linearity at the wavelengths yielding optimum low threshold currents.<>
Keywords :
current density; diffraction gratings; semiconductor lasers; 960 to 985 nm; Bragg wavelength; InGaAs-GaAs-AlGaAs; cavity length; detuning; gain peak; grating-surface-emitting lasers; linearity; long wavelength side; power-current linearity; threshold current; Bragg gratings; Etching; Laser modes; Linearity; Optical materials; Optical surface waves; Power generation; Power lasers; Surface emitting lasers; Threshold current;
Journal_Title :
Photonics Technology Letters, IEEE
