Title :
CW performance of an InGaAs-GaAs-AlGaAs laterally-coupled distributed feedback (LC-DFB) ridge laser diode
Author :
Martin, R.D. ; Forouhar, S. ; Keo, S. ; Lang, R.J. ; Hunsperger, R.G. ; Tiberio, R.C. ; Chapman, P.F.
Author_Institution :
Dept. of Electr. Eng., Delaware Univ., Newark, DE, USA
fDate :
3/1/1995 12:00:00 AM
Abstract :
Single-mode distributed feedback (DFB) laser diodes typically require a two-step epitaxial growth or use of a corrugated substrate. We demonstrate InGaAs-GaAs-AlGaAs DFB lasers fabricated from a single epitaxial growth using lateral evanescent coupling of the optical field to a surface grating etched along the sides of the ridge. A CW threshold current of 25 mA and external quantum efficiency of 0.48 mW/mA per facet were measured for a 1 mm cavity length device with anti-reflection coated facets. Single-mode output powers as high as 11 mW per facet at 935 nm wavelength were attained. A coupling coefficient of at least 5.8 cm/sup -1/ was calculated from the subthreshold spectrum taking into account the 2% residual facet reflectivity.<>
Keywords :
III-V semiconductors; aluminium compounds; diffraction gratings; distributed feedback lasers; epitaxial growth; gallium arsenide; indium compounds; laser cavity resonators; laser modes; optical couplers; quantum well lasers; reflectivity; semiconductor growth; 11 mW; 25 mA; 935 nm; CW performance; CW threshold current; InGaAs-GaAs-AlGaAs; InGaAs-GaAs-AlGaAs DFB lasers; InGaAs-GaAs-AlGaAs laterally-coupled distributed feedback ridge laser diode; anti-reflection coated facets; cavity length device; corrugated substrate; coupling coefficient; etched; external quantum efficiency; lateral evanescent coupling; optical field; residual facet reflectivity; single epitaxial growth; single-mode DFB laser diodes; single-mode output powers; subthreshold spectrum; surface grating; two-step epitaxial growth; Corrugated surfaces; Diode lasers; Distributed feedback devices; Epitaxial growth; Laser feedback; Optical coupling; Optical feedback; Optical surface waves; Substrates; Surface emitting lasers;
Journal_Title :
Photonics Technology Letters, IEEE
