Power Meters FAQ's

Thermal Laser Power Sensors

Choosing a Sensor


Surface Absorbers are spectrally broadband and spectrally flat due to their absorbing surface. With Surface Absorbers, the photons are converted to heat in the front layer of the absorbing surface. The P and PF versions of these sensors have a surface that absorbs within the volume of the coating. This provides superior damage resistance for high energy Q-switched type lasers, but has a lower damage threshold for CW lasers. This type of sensor is referred to as a Volume Absorber; the laser energy is absorbed in the volume of the material below the front surface. For a detailed discussion of thermal surface and volume absorbing sensors and absorbers for high power lasers, click here.


The spectral range stated at the beginning of the spec indicates the range of wavelengths for which the sensor can be usefully used even if the exact calibration is not specified for that range. This means that over the calibrated wavelength range, the accuracy is specified and guaranteed. Over a wider useful wavelength range, the sensor is usable but no accuracy is guaranteed. In general over this wider range, the accuracy will be within up to ±15%.