Newport LBP2 Series - Page 89

LBP2 User Guide Document No: 50306-001 Rev G 3/12/2020 Page 89
location, and peak fluence.
16
P
H
pulse power
x
3.46
Ratio of the pulse energy Q
to the pulse duration τ
H
.
17
P
av
average power
x
3.47
Product of the average
pulse energy Q and the
pulse repetition rate.
18
P
pk
peak power
x
3.48
Maximum of the power-time
function.
19
τ
H
pulse duration
x
3.49
Time between the half peak
power points at the leading
and trailing edges of the
pulse.
20
τ
10
10% pulse
duration
x
3.50
Same as above except at
the 1/10
th
of peak levels.
21

Q
quantum
efficiency
x
3.52
Ratio of the energy of a
single laser photon to the
energy of a single pumping
photon.
22
z
R
,
z
Rx
z
Ry
Rayleigh length
x
3.53
Distance from the waist
where the beam is √2 times
larger than at the waist.
for the Gaussian fundamental
mode:



4
2
0
d
z
R

Generally the formula




2
0
d
z
R
is valid.
23
z
0
,
z
0x
z
0y
beam waist
location
1
3.1
Position where beam widths
reach their minimum values
along the axis of prop.
24
M
eff
²
effective beam
propagation
ratio
1
3.5
For simple astigmatic beams
222
yxeff
MMM 
25

azimuth angle
1
3
4.3
7.2
9.3
The angle that the beam’s
axis system (major axis)
makes with respect to the
laboratory (camera) axis
system. (see equations in
ISO reference sections)
26

x
angular
x
3.1
Angular movement of the