Thermal Power Sensors; Wavelength Setting - THORLABS PM100USB Operation Manual

PM100USB
Required Adaptations
1) Adapter Connector
To connect a custom sensor to the PM100USB, an adapter needs to be used. To build the a-
dapter, please refer to the pin-out of the DE-9 connector shown in the
ode and an interlock must be connected to the sensor input. Please ensure correct polarity -
the photodiode cathode needs to be connected to ground.
The PM100USB and the utility software
presence of an adapter and show "Sensor Type: Photodiode Adapter" in the GUI.
2) Calibration Data
Be aware that spectral response calibration data of your custom photodiode are not sent to the
OPM utility software. It is necessary to account for them in your analysis.
3) Measurement Data
In your experimental setup, it is critical to set the responsivity of the sensor at the measured
operating wavelength in the utility software OPM under Devices-Settings, field: "Responsivity".
Please refer to the specifications of your used sensor.
Note
If the adapter is not automatically recognized or the settings can not be adjusted in the soft-
ware, please contact

5.2 Thermal Power Sensors

The PM100USB is compatible with the Thorlabs
S4xxC, S175C), equipped with a
seconds after plugging it to the DE-9 connector.
Thorlabs S3xxC and S4xxC Series of thermal sensors cover a wide range of applications and
are available with different coatings. To choose the appropriate sensor, refer to the section
Choosing the Right Sensor
Attention
Refer to the sensor data sheet and pay attention to the optical damage threshold! Exceeding
these values will permanently destroy the sensor!
Sensor Calibration
Thorlabs thermal sensors are calibrated for their spectral response and power at a specified
wavelength. The sensors spectral response data are stored in the non-volatile memory of the
DE-9 connector and are automatically downloaded by the PM100USB and utility software upon
plugging to the power meter.
Measurement Data
In your experimental setup using thermal sensors, it is critical to adjust the following settings in
the utility software OPM.

5.2.1 Wavelength Setting

To perform an accurate measurement it is necessary to enter the operating wavelength of the
measured light in the software. This way, the laser power can be calculated based on the
measured voltage and the correct response value from the wavelength calculation table.
10
Thorlabs .
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DE-9 connector
, see the Thorlabs website
14
Optical Power Monitor
C-Series of thermal power sensors
. The sensor is ready to operate only few
6
or contact
Appendix
35
will automatically recognize the
Thorlabs .
45
© 2020 Thorlabs
. A photodi-
(S3xxC,