Here is a video of something I made in my Opto-Electronics lab. It's a light emitting diode (LED) like the one by your computer monitor's power button (yours is probably green - mine is red). Really all we did in the lab was just added aluminum patches to a semiconductor wafer (GaAs) that was made specifically for LEDs. In the movie you see us increasing the voltage on the probe causing the LED to emit light.
The next task is to make a semiconductor laser, but that has not been successful at our school yet.
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