Overview of 3A-FS laser measurement sensor:

3A-FS is a low noise thermal power/energy laser measurement sensor with a fused quartz window. It has a 9.5mm aperture and can measure from 8μW to 3W and from 15μJ to 2J. It covers the spectral range from 0.19 to 2.2μm with window installed and to 20μm with window removed. The sensor comes with a 1.5 meter cable for connecting to a meter or PC interface.

3A-FS Sensor Drawing：

Main parameters:

Problem summary:

Can the BeamTrack sensor be used to measure the position and size of the pulsed laser?

Because position and size are measured together with power, if the laser pulses at a rate at which the average power can be measured, then position and size can also be measured.

Does the injury threshold depend on the power level?

The damage threshold of the thermal sensor really depends on the power level, not just the power density, because the sensor disk itself will become hotter at high power. For example, the damage threshold of Ophir broadband coating may be 50KW/cm²at 10W, but only 10KW/cm²at 300W. Ophir's damage threshold specification is always given for the maximum power used by a particular sensor.

What does it mean that the spectral range is beyond the calibrated wavelength range?

The spectral range described at the beginning of the specification represents the range of wavelengths that the sensor can effectively use, even if no precise calibration is specified for that range. This means that the accuracy is specified and guaranteed within the calibrated wavelength range. In a wider range of useful wavelengths, the sensor can be used but its accuracy cannot be guaranteed. Generally speaking, within this wider range, the accuracy will be within ± 15%.