Newport LBP2 Series - Page 91

LBP2 User Guide Document No: 50306-001 Rev G 3/12/2020 Page 91
(camera) system.
32
x y z
beam axis
system
x
4.2
A second coordinate system
that defines the axes of the
laser beam.
33
E
max
(z)
H
max
(z)
maximum
power/energy
density
x
3.1.5
Maximum of the spatial
power/energy density
distribution function E(x,y,z)
/H(x,y,z) at location z.
Peak fluence.
34
(x
max ,
y
max
, z)
location of the
maximum
x
3.1.6
Location of E
max
(z)/H
max
(z)
in the x-y plane at z.
35
E

Τ
(z)
H

Τ
(z)
threshold
power/energy
density
x
3.1.7
A fraction  of the max
power/energy density at
location z.
for CW-beams:
)()(
max
zEzE 



for pulsed beams:
)()(
max
zHzH 



where:
10  
36
P

(z)
Q

(z)
effective
power/energy
x
3.2.1
Evaluated by summing only
over locations (x,y) for
which:



EyxE ),(



HyxH ),(
37
f

(z)
fractional
power/energy
x
3.2.2
Fraction of the effective
power/energy to the total
power/energy at location z.
)(
)(
)(
zP
zP
zf



)(
)(
)(
zQ
zQ
zf



where:
1)(0  zf

38
),( yx
centroid
position
x
3.2.2
First linear moments at
location z.
39
ξ(z)
e (z)
beam ellipticity/
eccentricity
x
3.2.5
Method for quantifying the
circularity or squareness
(aspect ratio) of a
distribution at z.
ellipticity:
x
y
d
d
z


 )(