Is it possible to install a grating to a SLR Camera with a mirror lens ?

Is it possible to spectroscopy by this way ?

Do I need to illuminate the 30 meters up high mosaic with a laser light ?

Some researchers use fast lasers to vaporise the material from mosaic and take spectrum pictures with a grating on a telescope.

Green laser powerful pointers burn the hand . Do they make the similar to mosaic ? If not what is the cheaper way ?

Thank you ,

Mustafa Umut Sarac