Criteria for designing V-groove lasers

For designing
V
-groove lasers, the influence of the width of current injection
w
and the distance
d
of the diffusion front from the active layer is considered. Two laser designs with stable emission properties have been found: the first possibility consists of using a narrow current injection (
w \approx 3 \mu
m) while, alternatively, a wider current injection (
w \approx 5...8 \mu
m) can be used if
d
is less than about 0.5 μm, since a built-in antiwaveguide is then formed and this antiwaveguide stabilizes laser emission.