The effect of surface finish on the reflection of CO2 laser beams from specula

A potential source of hazard during gynaecological surgery with a CO2 laser is the reflection of the laser beam from the surfaces of the metal speculum. An experimental method of measuring the levels of radiation reflected from a variety of surfaces is described. Results which compare the effectiveness of different surface treatments in reducing reflections and show how this varies over a range of angles of incidence are presented. The significance of the results in terms of hazards to patients and staff is discussed.