Inspired by
Ken's implementation of
Christian Buil's design some time ago, this is what I have done so far... No images yet, just ideas on how to put together SHG with what I have on my junk yard...
The biggest challenge is slit (image of 1/2 blade through optical train is attached), considering it has to be very narrow (10 um as per Christian Buil), but I think I solved it - at least in principle, using Gillette razor blades and simple sliding mechanism to adjust the slit width. Hopefully it will work. I even have miniature stepper with linear actuator, I may use it at some stage in the future if I am happy with operation of this instrument.
Optical elements are: old Industar 50 lens as colimator, foil grating (1000 l/mm) and old Kyocera M400R camera with it's 10x zoom lens.
Everything is mounted on improvised frame made from cut-offs of "L" 50x50x3 mm extrusions (with machined holes for optics), assembled and tightened with screws...