I'm not an expert on EMC but from an optical point of view Optics are not completely EM immune, if you have polarization dependant components within your system em fields may introduce problems by altering the state of polarization of the light medium. If you need further info - contact me directly.
As for safety, adopted IEC standards such as EN 61010 or EN 60950 in conjunction with IEC 825 series should suffice. Regards Steve McRoberts CSA Pacific Region
