Surface Absorbers

Surface absorbers consist of a thin layers of materials, in general made of special mattes or refractory materials, deposited onto substrates, that can easily transfer heat like high conductivity metals. They are used for CW lasers or other sources that emit long pulses (with duration >300μsec). Radiation is almost entirely absorbed within that thin layer and then released as heat that flows through the thermopile.

Absorption and Damage Threshold Curves for Thermal Heads and Beam Position Sensors