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Have you considered using a reflective cylinder as a slit?
The effective slit width is dcyl / (4* focal ratio of input telescope) * cos (theta/2)
where d cyl is the reflective cylinder diameter, theta is the angle between input and output.
For example, f10 input and a say 1mm diameter needle with 90 degree direction change, effective slit = 1mm/40 *cos 45= 18 micron.
Google Maurice Gavin's various papers on the subject. He successfully built various SHGs based on the technique.
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