The listed power heads are based on
thermoelectric principles, which means
that the heat generated by the incident
radiation is transformed directly into
a voltage.
The
head of BB–series has a black,
broadband absorbing coating. The HP–series
are equipped with a ceramic coating
which allows high energy and power densities.
The
head HP 25 S is specially made for service.
The compact dimensions enable easier
transport. Due to the smaller heat sink,
high powers are only possible for a
short time.
The
heads need some seconds to reach a thermal
equilibrium. To avoid this delay time,
we recommend the use of one of our power
meters, such as LM
100 or LEM
2420. These devices determine the
voltage and its increase and evaluate
the laser power from this data. The
time constant from the whole system
is reduced to 1 second.
| |
BB
25 |
HP
25 S |
HP
25/50 |
HP
50 |
HP
25/150 |
active
diameter |
25
mm |
25
mm |
25
mm |
50
mm |
25
mm |
max.
power |
10
W |
10
W |
50
W |
30
W |
150
W |
max.
power density |
20
W/cm² |
20
W/cm² |
40
W/cm² |
20
W/cm² |
200W/cm² |
dimensions
[mm] |
Ø
120 x 80 |
Ø
90 x 32 |
Ø
120 x 80 |
Ø
150 x 80 |
Ø
120 x 60 |
sensitivity |
70
mV/W .. 150 mV/W |
connector |
BNC |
Absorption coefficent versus wavelength
for two coatings
permissible
power and energy densities versus wavelength
for sensors of HP-series
permissible power and energy densities
depending on pulse width for sensors of
BB-series
