Acktar Light Absorbing Coatings for Energetic Laser Applications (LIDT)

Acktar Black coatings are excellent performers where a combination of high absorptance and high tolerance of laser energy is required.

The Laser Induced Damage Threshold (LIDT) of a coating cannot be stated in general but depends upon a number of factors – wave length, pulse width, pulse rate, laser waveform, etc.
In the case of Acktar coatings – which absorb light – the LIDT depends also upon the ability of the substrate to quickly disperse the absorbed thermal energy.

Acktar coatings have been tested under a variety of test conditions and the results presented show that Acktar Black Coatings exhibit very impressive LIDT values under a broad variety of conditions and constitute an excellent choice where a combination of high absorptance and high tolerance of laser energy is required.

Summary of Presently Test Data

Wavelength Coating Substrate J/sqcm
1-on-1 10-on-1
EUV (~13nm) Magic Black > 3.5 below 3.5

 

Wavelength Coating Substrate W/sqcm J/sqcm
193 nm
pulsed (10ns)
Magic Black SS – 0.65 mm 9,500 0.096
Fractal Black SS – 0.65 mm 8,000 0.081
Al – 3 mm 8,600 0.086

 

Wavelength Coating Substrate W/sqcm J/sqcm
30 sec 60 sec
532 nm
quasi CW
(1μs; 20kHz)
Magic Black SS – 0.65 mm 1,500 780
Fractal Black SS – 0.65 mm 900 560
Al – 3 mm exceeds 8000 (test limit)
532 nm
(7.2ns; 100 Hz)
Metal Velvet Aluminum foil 0.144 (1-on-1)
0.132 (1000-on-1)

 

Wavelength Coating Substrate W/sqcm J/sqcm
30 sec 60 sec
1064 nm
quasi CW(1μs; 20kHz)
Magic Black SS – 0.65 mm 600 500
Fractal Black SS – 0.65 mm 400 400
Al – 3 mm exceeds 800 (test limit)
1064 nm
(10.2ns; 100 Hz)
Metal Velvet Aluminum foil 0.277 (1-on-1)
0.221 (1000-on-1)

 

Wavelength Coating Substrate LIDT – w/sqcm
10,600 nm CW Fractal Black exceeds 3,000 (test limit)