Patent ID: 8115909

Claim:
A sensor system comprising a lighting device and a detector device, wherein said lighting device is provided for emitting laser radiation of a first wavelength and laser radiation of a second wavelength different from the first, and said detector device is provided for detecting electromagnetic radiation of said first and said second wavelength wherein the lighting device comprises a semiconductor laser diode wherein said semiconductor laser diode has a first active region and a second active region, wherein said first and second active regions are contained in a semiconductor layer sequence of said semiconductor laser diode and are stacked one on top of the other, wherein said first active region emits laser radiation of said first wavelength and said second active region emits laser radiation of said second wavelength when said semiconductor laser diode is operating, and wherein each of said first and said second active regions has a quantum well structure and said quantum well structures differ in their layer thicknesses and/or in the dimension of quantization for obtaining the different emission wavelengths.