The 4 mm chemically etched tempered glass diffuser forms a fully non-porous barrier resistant to aggressive disinfectants (including vaporized hydrogen peroxide, VHP) and UV-C radiation. Its satin-finish outer surface minimizes specular reflections, so reflected laser radiation is diffused, reducing the hazard to staff and patients in line with ANSI Z136.3 recommendations for the safe use of lasers in health care.