1. Thorlabs MC2000 optical chopper system, last accessed 02.09.14.
2. Stanford Research Systems SR540 optical chopper system last accessed 02.09.14.
3. Newport 3502 optical chopper system last accessed 02.09.14.
4. Bentham 218M optical chopper module last accessed 02.09.14.
5. Holmarc HO-IAD-OC-01 optical chopper system last accessed 02.09.14.