Laser Beams Spreading

Some of my lasers are old (2-3years) and now the beams specially the ones at the two ends spread a lot(they are not outputting points but small lines). is there any way to fix this?

also how to fix the colours on lasers? i want to make all lasers output white but some of the old ones output bluish white...how to fix these issues?
 
That all depends on what is going on. If you are seeing the diode aray that is burning, then additional optics is required. It could also be that the system is out of alignment. Post a picture, maybe we can see something based on that.
 
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