A computer based laboratory experiment in the physics lab for students of communications engineering, computer engineering and software engineering is described. The aim of the experiment is to bring the students at an early stage into practical contact to modern physics such as semiconductors, wave and quantum optics, and to gain a deeper understanding of the mechanisms of absorption and emission of light by semiconductors. The actual experiment is divided into three parts: After getting

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... nted with the experimental set-up by calibrating the spectrometer the students measure the absorption coefficient in gallium phosphide and finally some emission spectra of different LEDs.