THORLABS PM100USB, Руководство по эксплуатации

Страница: 11 / 48

© 2020 Thorlabs
5 Sensor Dependent Functions
9
5 Sensor Dependent Functions
5.1 Photodiode Sensors
The PM100USB is compatible with all Thorlabs S1xxC-Series photodiode power sensors ,
equipped with a DE-9 connector . The sensor is ready to operate only few seconds after
plugging it to the DE-9 connector.
The S1xxC-Series includes photodiode sensors for various power levels that show advantages
in sensitivity, stability and drift when compared to thermal sensors. To choose the appropriate
sensor, refer to the section
Choosing the Right Sensor , see the Thorlabs website or contact
Thorlabs .
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
Photodiodes, neutral density filters and integrating sphere materials show wavelength depend-
ent behavior. Therefore each sensor is individually calibrated over its entire spectral operating
range. 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 plug-
ging to the power meter.
Measurement Data
When using photodiodes in an experimental setup, it is critical to adjust the following settings in
the utility software OPM.
5.1.1 Wavelength Setting
To perform an accurate measurement it is necessary to enter the operating wavelength of the
measured light in the software so that the laser power can be calculated based on the meas-
ured photo current and the correct response value saved in the wavelength calibration table.
5.1.2 Bandwidth Setting (Signal Filtering)
The analogue bandwidth setting influences the power reading.
The bandwidth can be set in the utility software OPM either to High (range dependent band-
width up to 100kHz) or to Low (15 Hz bandwidth).
For measuring CW or average power from pulsed sources, the bandwidth should be set to
Low .
5.1.3 Custom Photodiodes
The following custom photodiodes can also be used with the PM100USB:
·
Thorlabs photodiodes that are not part of the C-Series and do not have a DE-9 connector
·
Photodiodes from other providers
6
14
45