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- Feb 25, 2009
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I've been reading about the NUBM44 diode, which is very powerful but has a highly divergent slow axis, and I've been suggested to use this set of lenses to reduce its divergence.
Premise: I've never dabbled into the optics part of lasers, only into the burning part. Well, it's never too late to start, is it?
So, I see that there's a plano-concave cylindrical lens, in front of a plano-convex cylindrical lens. That makes me infer the following:
1) the fast axis of the beam must be aligned to the vertical axis of the lenses, so that the lenses themselves won't interfere
2) the plano-concave lens will expand the slow axis of the beam, while the plano-convex lens will make it rectilinear. This will make it impossible to focus the beam into a point, but it will be useful to project the beam to long distances
3) in order to focus the beam into a point, the plano-concave lens must be removed, so the divergence of the slow axis will actually be reduced
Can anyone with direct experience with those lenses (or similar sets) tell me whether my assumptions are correct?
Premise: I've never dabbled into the optics part of lasers, only into the burning part. Well, it's never too late to start, is it?
So, I see that there's a plano-concave cylindrical lens, in front of a plano-convex cylindrical lens. That makes me infer the following:
1) the fast axis of the beam must be aligned to the vertical axis of the lenses, so that the lenses themselves won't interfere
2) the plano-concave lens will expand the slow axis of the beam, while the plano-convex lens will make it rectilinear. This will make it impossible to focus the beam into a point, but it will be useful to project the beam to long distances
3) in order to focus the beam into a point, the plano-concave lens must be removed, so the divergence of the slow axis will actually be reduced
Can anyone with direct experience with those lenses (or similar sets) tell me whether my assumptions are correct?
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