Tunable grating-coupled laser oscillation and spectral hole burningin an InAs quantum-dot laser diode

摘要

Emission spectra are investigated of a low-threshold InAsnquantum-dot laser of the “dots-in-a-well” (DWELL) typenoperating near 1230 nm. An external dispersion cavity with a diffractionngrating is coupled to the laser diode to suppress the subsidiary modesnand to tune the central wavelength. A wavelength-dependent competitionnbetween the grating-coupled mode and the internal Fabry-Perot modes ofnthe laser suggests that a hole burning in the spectral density of anDWELL laser occurs with a characteristic spectral half width of ~13 nmn(10.5 meV). Simple models of spectral “flattening” andnspectral hole burning are presented to explain the broad free-runningnand grating-coupled lasing spectra of the DWELL device