Patent ID: 8879599

Claim:
A semiconductor laser, comprising: a. at least one semiconductor substrate; b. at least one active layer arranged on the semiconductor substrate; c. at least one frontal laser mirror which is arranged at a first end of the active layer and through which a first part of the radiation generated in the active layer emerges; and d. at least one rear laser mirror which is arranged at a second end of the active layer and lying opposite the first end and through which a second part of the radiation generated in the active layer emerges, wherein the at least one rear laser mirror is provided with a layer of absorbing material, and wherein the layer of absorbing material is configured to reduce a gradient of the luminous-power/current characteristic for radiation emerging through the at least one rear laser mirror, relative to a rear laser mirror without a layer of absorbing material; wherein a layer thickness of the layer of absorbing material is configured to reduce the gradient of the luminous-power/current characteristic by at least a factor of 1000; wherein at least one reflection layer is arranged between the at least one rear laser mirror and the layer of absorbing material having a reflection coefficient in the emitted wavelength range ≧90%; wherein at least one electrical insulation layer is arranged between the at least one rear laser mirror and the at least one reflection layer; and wherein the layer thickness of the layer of absorbing material and the reflection coefficient of the at least one reflection layer combine to reduce the second part of the radiation generated in the active layer emitted behind the layer of absorbing material to an undetectable level, thereby preventing the second part of the radiation from contaminating the first part of radiation.