I am using the light source as LED spotlight 50W (MFG part no: MASTER LED ExpertColor LED MR16 ExpertColor 7.2-50W 927 10D ). Hence i am planning for lens mechanism to convert the divergence rays to collimated one. The beam divergence angle of the light chosen is about 10 degrees. It would be nice if someone suggest the lens mechanism for collimation. I thought of using Plano- convex lens. Kindly suggest me which one to prefer.
This is a real problem. Collimated radiation can be achieved only with large power losses. The most effective and relatively simple solution is a Fourier filter: two short-focus lenses, a spatial filter with a very small window (hole) is installed in the focusing area. It is advisable to place the lenses on the alignment stands. With the ability to move along the propagation of the beam.
You can use camera objective lenses with variable f ratio or simply by using a conical lens
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