High performance quantum dot distributed feedback laser diodes around 1.15 μm

Monomode laser diodes in the wavelength range around 1.15μm are of particular interest for various kinds of applications, including frequency doubling where a large part of the spectral range from yellow to green currently remains inaccessible. For efficient frequency conversion, single-frequency laser light, as e.g. obtained from Distributed Feedback Laser (DFB) laser diodes, is an essential prerequisite. One particular challenge at this wavelength range around 1.15μm is to find a gain medium with high internal efficiency. For broad area (BA) lasers, good results have recently been achieved using quantum dots (QDs) or highly strained InGaAs quantum wells (QWs) [1]. In the following, first results for high performance monomode QD DFB laser diodes in the wavelength range of interest are discussed. The spectral gain properties of the underlying QD active region allow to realize DFB lasers with emission spanning an extremely broad wavelength range of 65nm ranging from around 1095nm to 1160nm based on the identical laser structure.