The basic structure of semiconductor laser diode modile: a pair of parallel planes perpendicular to PN junction form Fabri Perot resonator, they can be the cleavage surface of semiconductor crystal, or the polished surface.
The other two sides are relatively rough to eliminate the effect of the laser in the other direction of the main side.
The most important feature of the laser diode module is the unilateral guide. In the circuit, the current can only flow from the positive pole of the diode and the negative pole outflows.
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