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I am building a spectrophotometer for my robotics science club. I am using fibre optics cable to transport emission signal from the sample to spectrometer,next it is projected on the refelctive diffraction grating and then on the camera. However I discovered that the spectrum thanks to fibre optics is super thin (what a surprise) and I can't catch it one the camera. I considered a "beam expander" made of to colaminating lenses of different focal distances, however in professional specrophotmeter there is just a slit. Does it expand the light simply by diffraction? Is my method worth considering? I attach the image of current design. What camera would you recommend for detection?

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    $\begingroup$ There was a good link for a moment. It seems to have been erased. Using optical fibers in astronomy. In general, a good place to go when you have questions about optical components is The RP Photonics Encyclopedia $\endgroup$
    – mmesser314
    Commented Mar 5, 2023 at 16:03
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    $\begingroup$ Cheap diffraction spectrographs made of pieces sliced off a compact disc mounted in a cardboard housing will suffice. Instructions for how to build them are on the Interwebs and this is a fun project for students to do. You can also find diffraction gratings that attach to a cell phone; running an app on the phone will turn the phone into a very cool spectrometer which allows you to share spectra by messaging! $\endgroup$
    – niels nielsen
    Commented Mar 6, 2023 at 2:54
  • $\begingroup$ Guys, I know. I have done quite big research on spectrometers, and the one made of disc and shoe is unacceptable. The one I am desgining usesprofessional blazed diffraction grating. From the construction of our rover it has to have fibre optics to transfer the signal $\endgroup$
    – Alek Przybyłkowski
    Commented Mar 8, 2023 at 9:27
  • $\begingroup$ And the only issue is how to expand the beam coming out of the fibreooptics, not the spectrometer in general $\endgroup$
    – Alek Przybyłkowski
    Commented Mar 8, 2023 at 9:28
  • $\begingroup$ The blazed diffraction grating has 1200 groves/mm, dimensions 12×12×6, blaze angle 17° 27'. $\endgroup$
    – Alek Przybyłkowski
    Commented Mar 8, 2023 at 9:30

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