Connect the four pins of the laser diode

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My questions are very basic, but since it's the first time I will operate a diode like this, could someone tell me what voltage i have to apply to which pins? EDIT: I don't have a datasheet, or even an online reference. The purpose of this laser diode tutorial is to provide the information necessary to create a long lifetime, stable laser diode system. Most of the laser diodes are 3 pin, most of the wavelengths and output powers have 3 pins leads. They typically have three input pins: VCC (power supply), GND (ground), and SIG (signal).

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