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So simply because holding the caps would be hard, you assume that the optical phenomenon also would be invalid? I am having a hard time following the cause-effect trail on that argument :P I bet someone on here has a integrated cross cap, or a nice rig to hold the caps and could put this to...

Dear everyone, I am trying to create a matrix projection from a laser. Color is not essential on this stage. The theory is that a cross-type laser and a "star field" diffraction grating in front of it will provide the result shown below. Can anyone confirm this? Or provide a picture of the...

Thanks guys! So if I get a module, say a 658nm 100mw Red Laser Module, and 3D print a neat little DG holder which holds the DG close to the module it might be a problem over time? How do I solve this? What is DPSS? Thank you sir! Especially for providing the equation :D

Thank you so much for answering Lux Nitida, and especially for providing the pictures. They tell a thousand words ;-) Why do we not want light back into the aperture? Thank you too, Cyparagon. So, just to make sure I got it correctly at Dragon Lasers the fan and the matrix is the same, only...

I am looking to acquire some diffraction gratings, but I want to be sure I understand them. Therefore I have two general questions: 1. How are specs for DGs given? - How do I know the angle and amount of new dots? I.e how tightly spaced they are? 2. How are they usually mounted? I understand...

In a similar thread i found this very concrete suggestion: What would the resulting grid roughly look like from something like this? Sound quite similar to what I am trying to do? Note: The grid does not have to be perfectly square, nor does it need to have a defined "frame" as the picture I...

Thank you Alan. I will look into this alternative. Since it is just a piece of glass and a holder, do you think I could just attach it in another way (glue?) to the front of a waterproof module? Or is the distances / alignment involved critical?

Hi everyone! First of all: let it be clear that I am a total newbie when it comes to lasers. Therefore I will greatly appreciate any help and guidance provided. Thank you so much for taking the time to read this. For a student project not really related to lasers I am in need of a projected...