【正文】 sers 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 description ? Visible wavelength beam ( to mm) ? Over sec to cause eye injury ? Up to 1 mW CW ? Depends on aversion response Class 2 precautions ? Do not stare into the beam ? Do not point the beam at people or shiny objects ? Maintain separations for public displays ? Precautions for Class 1 lasers apply Class 3a description ? 1X to 5X Class 2 limits for visible radiations – to mm – Up to 5 mW as long as mW/cm2 ? 1X to 5X Class 1 limits for invisible radiations – UV ( mm) – IR ( mm) Class 3a precautions ? Do not view the beam directly with optical instruments ? Precautions for Class 1 and 2 lasers apply Class 3b description ? More than Class 3a but less than W ? “Immediate” eye hazard – UV: less than hours – VIS: less than sec – IR: less than to sec Class 3b precautions ? Avoid eye exposure to direct or reflected beam ? Review amp。Laser Safety at Fermilab Blast from the past! – 10/17/2020 Laser beam safety: a plex problem? ? Lasers are everywhere ? They vary in every respect ? How do we know that people are safe? Laser applications at Fermilab CDF nitrogen laser enclosure (2 lasers) A0 photoinjector accessory table Laser applications at Fermilab IB1 GammeV experiment laser enclosure Laser hazard factors radiation ? Intensity / Duration ? Wavelength – Kind of effect – Threshold exposure ? Modulation – CW – rPW – Other La