LBP2 User Guide
Document No: 50306-001
Rev G 3/12/2020
Page 88
7
d
x0,k
d
y0,k
d
σx0
d
σy0
beam waist
widths
x
3.13.1
3.13.2
Beam width measurements
performed at the waist.
8
T
device
efficiency
x
3.17
Ratio of the total
power/energy in the beam
to the total input
power/energy.
9
Θ
()
Θ
x()
Θ
y()
divergence
angle
x
1
3.18
5.2
Full angle of the far-field
envelope formed by the
increasing beam diameter
or widths.
fl
d
fl
,
Where fl is the focal length of a
focusing optic and d
σ,fl
is the
beam diameter at the focus.
10
H
()
average energy
density
x
3.20
Total energy of a beam
divided by its cross sectional
area.
11
Q
Q(z)
pulse energy
x
x
3.21
3.1.4
9.2.2
Energy in one pulse…
at location z. Joules
dxdy
z
y
x
H
z
Q
,
,
)
(
12
H(x,y)
H(x,y,z)
energy density x
x
3.22
3.1.2
Energy impinging on a
specified area x,y at
location z, divided by the
area
A. Often referred to
as fluence at a specific pixel
location, and peak fluence.
dt
z
y
x
E
z
y
x
H
)
,
,
(
)
,
,
(
13
E
()
average power
density
x
3.43
Total power of a beam
divided by its cross sectional
area.
14
P
P(z)
CW power
x
x
3.44
3.1.3
9.2.2
Power output of a CW
laser…
at location z. Watts
dxdy
z
y
x
E
z
P
,
,
)
(
15
E(x,y)
E(x,y,z)
power density
x
x
3.45
3.1.1
Power impinging on a
specified area x,y at
location z, divided by the
area
A. Often referred to
as fluence at a specific pixel
