Gentec-EO QE and XLE4 - Manual (Page 31)

QE Series Joulemeter Instruction Manual Version 3.0 April 2014 31
NOTE: The beam waist for a TEMoo beam is the radius of a circle centered on the beam axis and
containing 86 % of the beam energy. Ref.: SIEGMAN, A.E., An Introduction to Lasers
and Masers, p. 313 (Mcgraw-Hill Series in the Fundamentals of Electronic Science).
Example of energy density;
Io = 1 joule (total energy)
W = 1 cm
Energy density = 2 x 1 joule = 0.64 joule/cm
2

x (1 cm)
2
Example of power density calculation;
Io = 1 MegaWatt (total power)
W = 1 cm
Power density = 2 x 1 MegaWatt = 0.64 MW/cm
2

x (1 cm)
2