For high and very high power applications, we designed a new technology based on water calorimetry. 

In high power detectors such as our HP series, after the laser optical power hits the absorber of the detector, the heat absorbed by the thermal mass is transferred to the cooling water in the cooling circuit. Instead of analyzing the electrical output of a thermopile disk, our high power detectors measure both the flowrate and the temperature change of the cooling water. 

Both measured flowrate and water temperature difference are used to determine the optical input laser power.

Some of the biggest advantages of calorimetric detectors are robustness and high cooling efficiency. These detectors also measure cooling water parameters and thus offer a safer operation.

Browse Water Calorimeter Detectors for High Power here.