Laser Safety (with 100% Errorless Answers)

LASER definition correct answers Light Amplification through Stimulated Emission of Radiation Irradiance correct answers power/area, W/cm^2 Limit for outdoor nighttime distraction correct answers 50 nW/cm^2 FIR exposure duration time limits correct answers intrabeam 10 sec, diffuse 10 sec NIR exposure duration time limits correct answers intrabeam 10 sec, diffuse 600 sec visible exposure duration time limits correct answers intrabeam 0.25 sec, diffuse 600 sec UV exposure duration time limits correct answers intrabeam 30,000 sec, diffuse 30,000 sec Class 2 AEL correct answers AEL=1.0 mW, MPE=2.5 mW/cm^2 AEL correct answers Accessible Emission Limit (watts) retinal hazard wavelength range correct answers 400-1400 nm Class 1 AEL correct answers MPE / area of limiting aperture minimum viewing distance correct answers closest distance the eye can focus, 10 cm radiant exposure correct answers energy/area, J/cm^2 3 factors affecting hazard class correct answers 1. capability to injure people 2. environment where the laser is used 3. personnel using or exposed NOHD equation correct answers angular subtense correct answers apparent visual angle actual size of the source divided by it's distance from the eye α = d/r extended source correct answers angular subtense at the cornea is larger than alpha-min divergence correct answers d/r (radians) where d is beam diameter r is radius (distance) diffuse reflection correct answers scattered