Ridge type semiconductor laser of distributed feedback
AssigneePioneer Corporation
InventorsYoshiaki Watanabe, Nong Chen, Kiyoshi Takei, Kiyofumi Chikuma
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Abstract
A semiconductor laser includes an active layer made of semiconductor; a ridge stripe having a cladding layer formed on the active layer and a contact layer formed on the cladding layer to protrude from the active layer; a pair of gratings each having a periodic structure in a longitudinal direction of the ridge stripe having a plurality of grooves each extending from side walls of the ridge stripe on flat portions in both sides of the ridge stripe; and absorbing layers covering the surfaces of the grooves of gratings to absorb excited light.
Claims11
A semiconductor laser comprising:
- an active layer made of semiconductor:
- a ridge stripe having a cladding layer formed on said active layer and a contact layer formed on the cladding layer to protrude from said active layer;
- a pair of gratings each having a periodic structure in a longitudinal direction of the ridge stripe having a plurality of grooves each extending from side walls of the ridge stripe on flat portions in both sides of the ridge stripe;
- and
- absorbing layers covering both surfaces of the grooves of gratings to absorb excited light;
- wherein each of said absorbing layers comprises a first insulator kept contact with the surfaces of the grooves of gratings;
- a metal layer contiguously formed on the first insulator;
- and a second insulator contiguously formed on the metal layer.
A semiconductor laser comprising:
- an active layer made of semiconductor:
- a ridge stripe having a cladding layer formed on said active layer and a contact layer formed on the cladding layer to protrude from said active layer;
- a pair of gratings each having a periodic structure in a longitudinal direction of the ridge stripe having a plurality of grooves each extending from side walls of the ridge stripe on flat portions in both sides of the ridge strips;
- and
- absorbing layers covering both surfaces of the grooves of gratings to absorb excited light;
- wherein each of said absorbing layers is an insulator layer comprising an insulator material as a matrix and metal particles dispersed in the matrix.
Dependencies are inferred from the claim text.