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DLP6500FYE: Application inquiry

Renan Santos Adriano
Genius 16540 points
Part Number: DLP6500FYE

Hello Team,

Can you please tell me what is the maximum power that can be used without
damaging the modulator?

I found this information on the official website:
1) In the visible range up to 25 W/cm2 and thermally limited;
2) In IR (above 700 nm) up to 10 mW/cm2;
Values differ by a factor of more than 1000, are they correct?

Also, my customer is going to operate DLP6500 in the infrared range:
1) continuous radiation at 800 nm, source power up to 80 mW;
2) pulsed radiation 1040-1060 nm, pulse energy 1 nJ, pulse repetition rate
70 MHz, pulse duration 150 ns, source power up to 1 W.

Is this okay?

Regards,

Renan

  • 0
    TI__Mastermind 43165 points

    Renan,

    I need to inform you that in terms of the DMD warranty operating at these wavelengths is not covered.  That is what the numbers are communicating, that they AR window coatings are not designed for IR.

    With that said, the power seems reasonable which I calculate to be about 70 mW  average power with 1 nJ/pulse at 70 MHz, but has not been tested.

    There is something in error in the provided numbers, since at 70 MHz a cycle is about 14.3 ns, so each pulse cannot be 150 ns long.  Did you mean 150 ps?

    Fizix

  • 0 in reply to Fizix
    TI__Genius 16540 points

    Hello Fizix,

    Please see my customer response below:

    I have given the wrong pulse duration, it is 150-200 fs with the energy of 15 nJ. The average energy in the pulse will be much more than 70 mW, on the order of 75 kW. We are going to attenuate the incoming radiation, but don't know what limit value can be applied avoiding damage to the modulator. We would be very grateful if you could give us an approximate W/cm2 value. And we understand that the warranty does not cover such case.

    Regards,

    Renan

  • 0 in reply to Renan Santos Adriano
    TI__Mastermind 43165 points

    Renan,

    TI has not done much testing in the fs regime.  In the fs range it is possible to ablate material without heating the substrate, so it may be possible to erode the mirror over time.  Moreover, at high fluences it is not possible to predict the consequence of multi-photon events.

    I assume that the 75 kW is the average power during the pulse, but not the time averaged power over 1 second.  Is the 70 MHz still correct?  If so, then this sounds more like about 1 W time averaged power over a second.

    So the time averaged power is not a problem, but peak power may be since the pulse duration is so short.

    Fizix