Semiconductor laser device

H - Electricity – 01 – S

Patent

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Details

H01S 5/20 (2006.01) H01L 21/24 (2006.01) H01S 5/02 (2006.01) H01S 5/22 (2006.01) H01S 5/042 (2006.01) H01S 5/343 (2006.01)

Patent

CA 2360441

A semiconductor laser element (30) comprises an n-type GaAs substrate (32) having a band gap energy of Eg1, on which are epitaxially grown an n-type AlGaAs cladding layer (34), an active layer (36) formed as a 2-layer quantum- well structure of InGaAs and GaAs and having a band gap energy of Eg2 smaller than Eg1, a p-type AlGaAs cladding layer (38), and a p-type GaAs cap layer (40). The cap layer and the p-type cladding layer have stripe mesa structures. Passivation film (42) of SiN is formed in the areas except on the cap layer, and a p-side electrode (44) is formed on exposed part of the cap layer and the passivation film. An n-side electrode (46) consisting of a metal laminate of In/AuGe/Ni/Au is formed on the back of the substrate, and an InGaAs layer (48) lies as an absorber medium between the GaAs substrate and the n-type electrode.

Un laser à semiconducteur (30) comporte : un substrat GaAs du type n (32), à bande d'énergie interdite d'Eg1, sur lequel une couche de placage AlGaAs (34) du type n est formée par croissance épitaxiale ; une couche active (36) se présentant sous forme de structure de puits quantique bicouche de InGaAs et GaAs et à bande d'énergie interdite Eg2 inférieure à celle de Eg1 ; une couche de placage AlGaAs (38) du type p et une couche d'encapsulation GaAs (40) de type p. La couche d'encapsulation et la couche de placage du type p présente des structures mésa en ruban. Un film de passivation (42) de SiN est formé dans les zones, sauf sur la couche d'encapsulation, et une électrode côté p (44) est formée sur la partie exposée de la couche d'encapsulation et du film de passivation. Une électrode côté n (46) constituée d'un stratifié métallique de In/AuGe/Ni/Au est formée sur le dos du substrat, et une couche InGaAs (48) fait office de milieu absorbant entre le substrat GaAs et l'électrode de type n.

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