// multi-utility computation suite · offline · instant · precise
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sci.laser-power-intensity Calculator
Calculates laser beam intensity from power and beam radius: I = P/(πw²) for a Gaussian beam, and peak intensity. Class 3B laser (> 5 mW visible): minimum safe viewing distance 13 m — 1 W focused to 50 µm spot gives 1.3 × 10⁸ W/m², sufficient to ablate most materials.
Inputs
Power Mw
Rate of energy transfer (W). P = V×I (electrical). P = F×v (mechanical). 1 horsepower ≈ 746 W.
Beam Diameter Mm
Distance across a circle through its centre. Always confirm units match the rest of the calculation.
Pulse Duration Ns
Length of time the process lasts. Ensure units are consistent with rate inputs.
Rep Rate Khz
Amount per unit of time or per unit quantity. Check the denominator before interpreting.
Results
average irradiance (W/cm²)
The arithmetic mean -- sum divided by count.
peak irradiance (W/cm²)
IRR (internal rate of return) -- the annualised return rate at which net present value equals zero. If IRR exceeds the hurdle rate, the investment adds value.
pulse fluence (J/cm²)
Sample size or count used in the calculation.
laser safety class
The classification assigned based on the computed value.
I = P/A
Reference formula or conversion factor shown for context.
IEC 60825-1
Reference formula or conversion factor shown for context.