LBP2 User Guide
Document No: 50306-001
Rev G 3/12/2020
Page 90
3
The asymmetric beam axis distribution should not be confused with the asymmetric beam power/energy
distribution function.
y
movement
beam in the x-z and y-z
planes. Requires a focusing
element.
27
x
y
beam angular
stability
x
3.2
8.2
Twice the standard
deviation of the measured
angular movement.
fl
s
x
x
2
fl
s
y
y
2
fl
s
2
Where s is the angular standard
deviation of the energy/power
distribution and fl is the focal
length of the focusing optic.
28
a
x
a
y
transverse
displacement
x
3.4
Distance of transverse dis-
placement of the beam in
the x and y directions.
29
azimuth angle
3
x
4.2
8.1c
The angle that the major
axis of the asymmetric
centroid histogram plot
makes with respect to the
laboratory (camera) axial
system. (see Figure 1 in the
ISO reference)
30
(z’)
x
(z’)
y
(z’)
(z)
x
(z)
y
(z)
beam positional
stability
x
3.5
8.1
Maximum transverse
displacement and/or
angular movement of the
beam away from an
average, steady-state
position.
s
z
2
x
x
s
z
2
y
y
s
z
2
Where s is the standard
deviation of the energy/power
distribution.
31
x’ y’ z’ laboratory
system
x
4.2
The orthogonal coordinate
system of the laboratory
