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I have actually never tried. I would expect it to work but maybe orientation of the sample could change light intensity.

If you do some tests, please share your results

I can give a brief explanation for a better understanding :) The laser spot is re-imaged on the slit which clips the width (but not height) of the spot. This clipped spot is re-imaged again on the camera after horizontal dispersion by the grating. The spectrum, in black, is obtained by summing the c...

For calibration, cheap PMMA fibers might do the trick. As always, it's a trial and error process but I don't see reason it wouldn't work. What I did in the past (for other projects) was to buy audio patches from store like Wal-Mart and to cut the end, print or machine a custom connector and glue it....

Yes you definitely can it's just more expensive and you can't change easily the image size by moving the lens relative to the fiber

In the past I used some cheap PMMA fibers for audio setups but they don't have SMA connectors. If you have a 3d printer you could work something out.

It should (IMHO) work for the calibration part.

I tried but without much success. No idea what the beam waist is or other gaussian parameters :-/ I tried putting a 20x beam expander in front of it without any apparent changes; this LD bugs me out because I never had issues with other LD or SM fibers. If you find something, please report your obse...

No you'll need something like https://www.thorlabs.de/thorproduct.cfm ... ber=M29L02 with a 19mm achromat lens for collimation

Hi, It's always a multimode fiber (I don't own single mode ones). Just I don't have one with a large core so I compensate with a XY stage but it's an inferior solution. It's really a question of getting light on the slit and not 100um next to it. Don't forget to rotate the grating, it's possible tha...

OK I think I narrowed it down

What wavelength is your fiber locator?

I presume you're simply imaging the slit out of the camera active area. Try rotating the grating when the slit is vertical. You should find the signal then.

Yes indeed, but then I don't understand why you don't see the slit in the vertical position :-/ Nonetheless, you can't align with just one ray (laser) and need at the very least two -- the more the better, provided you can cleanly discriminate them. Hence the neon lamp. Other lamps could work but ba...