DEPENDENCE OF THRESHOLD CURRENT AND LINEARITY ON BRAGG WAVELENGTH FORGRATING-SURFACE-EMITTING LASERS

We report on a systematic experimental study of the dependence of the threshold current and power-current linearity on the detuning of the B ragg wavelength from the gain peak for grating-surface-emitting lasers . Minimum threshold currents were obtained for lasers emitting at wave lengths 2 to 9 nm on the long wavelength side of the gain peak, depend ing on the cavity length. Threshold currents as low as 98 A/cM2 were o btained at the optimum Bragg wavelength. A strong dependence of the li nearity on the detuning was found and the lasers showed good linearity at the wavelengths yielding optimum low threshold currents.