Auto Range; Trigger Level; Average Power Measurement; Density Calculation - THORLABS PM100USB Operation Manual

Optical power meter

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PM100USB

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 pyroelectric sensors are calibrated for their spectral response.The sensors spectral re-

sponse 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, it is critical to adjust the following settings in the utility software

OPM.

5.3.1 Auto Range

The PM100USB cannot be switched to auto range mode in the utility software OPM, when a

pyroelectric sensor is connected. The measurement value will be updated with each incoming

pulse. When no pulses appear, the last measured value will be shown in the display.

A trigger level can be set to exclude unwanted low-power pulses from the analysis. When an in-

coming pulse exceeds the set trigger level, the peak detector circuit gets armed and is waiting

until the pulse peak is reached. After finding the maximum voltage, this level is kept and the mi-

croprocessor reads the AD converted voltage for displaying the pulse energy. Finally the peak

detector circuit gets a reset and is ready for the next pulse. Please see the manual of the OPM

software for instructions on how to set the trigger level.

The PM100USB calculates the average power of pulse trains from the single pulse energy and

the repetition rate. Please see the manual of the utility software OPM for more details.

When the correct beam diameter of the incident beam is entered, this function returns the en-

ergy density in J/cm².

The following custom pyroelectric sensors can also be used with the PM100USB:

· Thorlabs pyroelectric sensors that are not part of the C-Series and do not have a DE-9 con-

nector

· Pyroelectric sensors from other providers

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