lasersafetyatfermilab

lasersafetyatfermilab内容摘要：

AG(2X) 532 Ar ion 633 HeNe Many 656 InGaAlP 669 GaAs 780 GaAlAs 808 Diode 850 GaAlAs 1054 Nd:YLF 1064 Nd:YAG 1064 GaAs 1310 Diode 1550 Diode What standard do we follow? • ANSI – American National Standard for the Safe Use of Lasers – Guidance is exhaustive (and exhausting) • Required by 10 CFR 851 – DOE Worker Safety amp。 Health Rule – Locked into “2020” version of ANSI standard Some acronyms • LSO Laser Safety Officer • MPE Maximum Permissible Exposure – The max amount of laser radiation that doesn’t cause a harmful effect (units are J/cm2 or W/cm2) – BTW – The MPE is a plex function of wavelength, modulation amp。 exposure duration • NHZ Nominal Hazard Zone – The space within which the MPE is exceeded – Includes direct, reflected amp。 scattered radiations Reflections • Specular – Mirrorlike – Irregularities l “Smooth” – Angle incidence = Angle reflection • Diffuse – Fuzzy – Irregularities l “Rough” – Max reflected normal to surface Different kinds of “laser people” • Laser operators – People who operate laser systems that emit harmful levels of laser radiation. • Spectators – People whose access to potentially harmful levels of laser radiation is controlled by the laser operator. More roles • The Public – People who must be isolated from potentially harmful levels of laser radiation because the laser operator cannot control their access. Lasers by hazard class Class 1 • Description – Any wavelength (meaning to 103 mm) – Over 8 hrs of direct eye exposure to cause injury – 40 to 400 mW for visible CW lasers • Precautions – Usually none – But watch out for the following • Disassembly if enclosed laser has higher hazard class • Modifications that may increase the hazard class Class 2。