Am I Safe? This is the minimum irradiance or radiant exposure that may be incident upon the eye or skin without causing biological damage. E e = Φ e,source / 4πr². How to convert irradiance into photon flux. 2.4. 1.5 Calculation of radiometric quantities (Examples) When you solve for PowerDensity = Power (W) / πr2 = Power / π (0.5mm)2 ≈ 127 x Power (W/cm2); the answer should 1.27 x Power (W/cm2) unless I am missing something. PDF Laser Pulses Power Energy Equations - Thorlabs Audience Scanning safety | Pangolin Laser Systems Use the IRR1-SOL to obtain the amount of . This worksheet is aimed for computation of Maximum Permissible Exposure ( MPE) for light sources. Its international unit of measure is watt/m2. (Ideally, this should be done back at the studio, with good prior knowledge of the show site. The modeled laser pulses (top) and CW laser output (bottom) provide the same energy per period, illustrated by the shaded areas. (You can see your precise laser pulse shape with a fast photodiode like the FPS-1) Tophat calculations are for ideal tophat laser beams. This calculator assumes square pulses. \Delta\lambda Δλ at a certain central wavelength. The chart below shows how the eye injury hazard increases as the laser's power increases. Flexible measurements: Irradiance data can be used to calculate various power parameters and color. If you know the power in watts, multiply the watts by 1000 to get milliwatts. The CW laser's output power equals the pulsed laser's average power. Laser Calculator - Kvant Lasers, s.r.o. The total energy delivered, divided by the area (energy per unit area) is called fluency or energy density.