High Power Diode Lasers - Center for Biomedical Optics and New ...

Others solutions to improve the brightness (3) : external approach
Risø National Laboratory
Optics & Fluid Dynamics Dept.
New Laser design at Risø National Laboratory
Gain- and refractive index gratings in broad area laser
diodes
may be used for selective amplification of spatial modes
The effect is based on spatial hole burning in the active
semiconductor gain material.
The third order nonlinear susceptibility and the mode
suppressions factor depend on the angle between the
interacting beams in the four-wave mixing.
A narrow range of angles exist with strong gratings and
good mode suppression.
P.M. Petersen et al.