Hello friends. I'm new to the forum. I bought a 15w blue laser diode 1 week ago. When the laser came in, it worked fine. But I took out the lens of the laser module and ran it. In the meantime, the laser beam emerging as a rectangle began to form a line. When the laser module lens was reinstalled, the laser power was reduced. This is the picture of the last ray of the laser beam.(When the laser module first came in, the laser beam was in the shape of a rectangle.) I'm very happy if you help. Good forums.
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