[luka]

Hi,

I have been looking around but have found only links to spectrometers using gratings. I have an opportunity to obtain an acousto-optic tunable filter (AOTF) which, I was hoping, could be used to make an astronomical spectrometer.

I am not quite sure where to start (no experience in astronomical spectroscopy) so here are few details and questions.

The AOTF has a very small entrance aperture (2x5 mm square) so the light from a star would need to be focused on this. How do people focus light from a particular star using gratings? I could not find details how to pick a starlight from one particular star and not from whatever else is in the field of view of the telescope.

In the AOTFs the wavelength is scanned using a computer and I was planing to use a photodiode or something similar to detect the light coming out of the filter. The resolution would be around 2nm, depending on the wavelength.


Any thoughts/hints/ideas/advice would be greatly appreciated,

Luka