Semiconductor laser device

A self-aligned structure semiconductor laser device comprising:

• an active layer;
• an optical guide layer formed on one face or a pair of optical guide layers on both faces of the active layer, respectively, the optical guide layer(s) having a band gap wider than that of the active layer;
• a pair of cladding layers formed so as to sandwich the active layer and the optical guide layer(s) therebetween, the cladding layers having a band gap wider than that of the optical guide layer;
• and
• a current blocking layer having a band gap wider than that of the active layer and a stripe-like window embedded in at least one of the cladding layers;
• wherein a diffraction grating for controlling an oscillation wavelength is formed on an interface of the current blocking layer and the cladding layer in which the current blocking layer is embedded or between the current blocking layer and the active layer excluding the stripe-like window.

A self-aligned structure semiconductor laser device comprising:

• an active layer;
• a pair of optical guide layers formed respectively on both faces of the active layer, the optical guide layers having a band gap wider than that of the active layer;
• a pair of cladding layers formed so as to sandwich the active layer and the optical guide layers therebetween, the cladding layers having a band gap wider than that of the optical guide layers;
• carrier blocking layers formed respectively between the active layer and the optical guide layers, the carrier blocking layers having a band gap wider than those of the active layer and the optical guide layers;
• a current blocking layer having a band gap wider than that of the active layer and a stripe-like window embedded in at least one of the optical guide layers,
• wherein a diffraction grating for controlling an oscillation wavelength is formed on an interface of the current blocking layer and the optical guide layer in which the current blocking layer is embedded or between the current blocking layer and the active layer excluding the stripe-like window.