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Gents, I wonder if somebody would advice me. I need in my application rectangular laser beam shape. How to achieve that? What makes rectangular one, lens or laser diode type?

Guys any advice about some proper combination of laser diode with small-size optics (actually where to start) for some decent uniform 100mrad beam?

to Cyparagon> Personally I tried couple of inch sized laser illuminator which gave 10m circle spot at 100m with pretty uniform intensity inside (only weird thing that at edge of spot was some concentric high-dense circular lines - Fresnel lens???). It really exists! It seemed it has not complex...

To Cyparagon> I need uniform intensity of beam spot. That is most crucial requirement in my application.Do not you think that colimating lens just can help before getting beam diverged? To all: Q1 I wonder if some LPF member familiar with optical design would give me valuable general advice...

I would not say any lens. I am convinced just about concave(-planar?) lens type. And what about colimator before divergence lens? I think to get good results source beam exiting of LD should be colimated first. My spot should be circular.

Dear Gents, and what about wider beam? I have laser diode module with focusable lens (0.1 rad - 10rad). I need to get cca 80-100 mRad divergence. Does anybody have idea how to increase divergence? I assume using some concave precision lens but I am not sure about focal lenght. I found nice...