92
2. Volume absorbers:
P (pulse) type absorber
The models with the P suffix, for use with pulsed lasers,
have a special absorbing glass with an absorbance of 95
±2% over the operating range. Since the surface is a
glass, its reflectivity does not change even if damaged or
melted locally.
HE (high energy) absorber
The HE type has a particularly high damage threshold for
pulsed and repetitively pulsed lasers of both the short
and long pulse variety and is useful where the highest
pulse energies and average powers are used.
PF (high energy high average power) absorber
The newest PF type absorber has a high damage
threshold for short pulses and can stand relatively high
average power density as well. In addition it is able to be
deposited on large areas so it is the absorber of choice
for many applications.
Absorption vs. Wavelength of Various Thermal Sensor Absorbers
Graph 1
