See https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=8166 https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=81... for examples of modern LCD sh

See https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=8166 https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=81... for examples of modern LCD shutters. They have closing times that are in the hundreds of microseconds, so they are not really replacements for ultra-short exposures. But they are "cheap".