Laser & Photo-Medicine Definitions

Calculations

Power Density (W/cm2) =

Laser Output Power (W) Beam area (cm2)

Beam Area (cm2) =	Diameter(cm)2 x 0.7854
Beam Area (cm2) =	Pi x Radius(cm)2

Energy (Joules) =

Laser Output Power (Watts) x Time (Secs)

Energy Density (Joule/cm2) =	Laser Output Power (Watts) x Time (Secs) Beam Area (cm2)
Energy Density (Joule/cm2) =	Power Density (W/cm2) x Time (Secs)

Treatment Time (Seconds) =	Energy Density (Joules/cm2) Output Power Density (W/cm2)
Treatment Time (Seconds) =	Energy (Joules) Laser Output Power (Watts)

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