… The need for spectral stabilisation can be avoided by using internal wavelength
stabilization with a Distributed Feedback (DFB) structure. In this case the wavelength
variation is governed by the temperature dependence of the refractive index, which results
in a shift of below 0.1nm/K only. … We reported a novel high power broad area DFB laser
diode based on a Al free active region high wall plug efficiency structure with the addition of
an epitaxial re-growth over Bragg gratings. We have realised both 1st and 2nd order …

Due to the narrow absorption peak of Yb in glass at 975nm, a wavelength stabilisation is
necessary for pump laser diodes. Our original approach is to use a Distributed Feedback
broad area structure which is made possible since we use an Aluminium free active region
laser structure. The target is to obtain high optical power of 10W with both a reduce
wavelength evolution with temperature and a low spectral width. On a 3mm x 100 μm BA
Fabry Perot laser, we have obtained a high power of 10W. Design, fabrication and results on …