FocusMonitor FM+
35,0(6
47
Revision 03/2019 EN
18.2
Variety of detectors and measuring tips
Different measuring tips and detectors are available for different wavelengths, power density ranges, or beam
divergences so that measurements can be recorded at a maximum power in each case. This ensures that
an optimum configuration of the FocusMonitor FM+ is achieved. Only one value can be exploited fully for the
power or power density.
Measuring tips
CO
2
high power
NIR high div
Diode
Typical pinhole diameter in µm
20 – 25
20
50
Beam divergence/acceptance angle in mrad
< 240
< 200
< 500
Typical wavelength in µm
9 − 12
0.4 − 1.7
0.4 − 1.7
CO
2
laser
Max. power density *) in MW/cm²
30
—
—
Max. power in kW
15
—
—
Nd: YAG laser
Max. power density *) in MW/cm²
—
10
1
Max. power in kW
—
10
4
VIS laser
Max. power density *) in MW/cm²
—
5
—
Max. power in kW
—
5
—
Diode laser
Max. power density in MW/cm²
*
)
—
2
1
Max. power in kW
—
6
4
Suitable detectors
Detector types
DFC+
DFIG-PS+, DFY-PS+
DFIG-PS+, DFY-PS+
Tab. 18.1: Variety of measuring tips and detectors
*) Please note the damage threshold in Tab. 18.4 on page 49 and Tab. 18.6 on page 51.
Depending on the model, the measuring tips are suitable for different power densities. The power density is
dependent on the laser power and focus size.
Different detectors are used, depending on the application:
Detector type
Laser
Type of sensor
Amplification
Wavelength range in μm
DFC+
CO
2
Pyroelectric detector
1
9 − 12
DFY-PS+
NIR/VIS
Photodiode
Automatic adjustment of
the sensitivity
0.4 − 1.1
DFIG-PS+
NIR
Photodiode
Automatic adjustment of
the sensitivity x
0.9 − 1.7
Tab. 18.2: Variety of detectors
