Comparing GRIN Lenses vs Convex for Laser Beam Collimation

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The discussion centers on the comparison of GRIN lenses and aspheric-convex lenses for laser beam collimation, particularly in a delicate fiber laser focusing system. The user is interested in the optical advantages of each lens type, especially given the need to reduce a 4mm beam to 0.05mm in a marine environment. While GRIN lenses are appealing for their compact design, there is a suggestion that bi-convex lenses may outperform them in terms of spherical aberration. The inquiry highlights the importance of understanding specific collimation requirements and the potential limitations of each lens type. Overall, the effectiveness of GRIN versus convex lenses remains a key consideration for optimal laser performance.
fsonnichsen
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I am interested in comparing the effectiveness of GRIN lenses vs aspheric-convex ones for collimating laser beams. I can imagine some practical advantages however I would be interested in any information comparing the advantage of one method over the other from an optical standpoint.

Thanks,
Fritz
 
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I have limited experience using those devices; AFAIK they are only required for very specific applications. What is your specification for collimation, and why can't you use a pinhole/plano-convex lens?
 
Andy
we are setting up a delicate fiber laser focusing system. The beam is being crunched down from 4mm to about .05mm. This will be deployed in a mecahnically rough (marine) envirionment. The commercial grin lens devices are attractive, self contained etc. But from a technical point of view my understanding, which is somewhat dated, is that some basic bi-convex lens constructs can superceed the quality of a grin lens with regards to spherical ab.
 

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