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DLPLIGHTCRAFTER: Laser Damage Threshold for Lightcrafter and other DLP/DMD

Stephen Welsh
Prodigy 10 points

Part Number: DLPLIGHTCRAFTER

Hello, I am seeking to obtain technical specifications/documentation for the laser damage threshold on the Lightcrafter and other DLP Products, such as the 9500DLP. 

If anyone could provide some experimental results or point me in the right direction that would be most appreciated. 

As a reference, I have provided some details on my laser below:

The beam has diameter of about 6 mm (at 1/e level) , and is almost of Gaussian shape, i.e. P = P0 * exp (-(R/W)^2),
so 2W ~ 6 mm, where R is radius/distance from the beam axis.
 
Total (average) power in the beam can be around 0.1 or 0.2 Watt,
And the pulse repetition rate is 100,000 (1E5) pulses per second;
With the pulse duration of 500 fs (500*E-15 sec),
the Peak power, P0 to be about 2-4 MW (as the pulse energy is around 1 or 2 micro-Joules).
The peak intensity
I = P0/A
4*10^6 W/0.25 cm^2 or
16 MW/cm^2
(sixteen Mega-Watt per square centimetre).
  • 0
    TI__Mastermind 43165 points

    Hello Stephen,

    Welcome to the DLP section of the TI-E2E Community.

    We do not supply a direct specification on energy damage threshold with pulsed lasers because of the great number of variables involved.  Heat dissipation is the primary issue, but depending on the repetition rate, peak power and pulse width, it can be the time average power dissipation from one mirror, or in another operating regime it can be the heat dissipation from the array (time average power on the array).

    At 100 kHz repetition and 1 - 2 µJ per pulse the time average power for the array is fine, and the time average power at each mirror as a heat capacitor is also fine.  However, we have not done testing with fs lasers, so it might be possible at this time duration and power to ablate an atomic layer or two of the surface of the mirror with each pulse.  In this case it is the heat dissipation through the thickness of the micro-mirror that comes into play. 

    You will need to test this. 

    Fizix