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How long work mirrors with 100 femtosecond laser pulses at wavelength of 800 nm with 80 MHz

Frank Garwe
Prodigy 20 points

We want to illuminate Alu mirror array with expanded (to area of mirror area) 100 fs laser pulse beam at wavelength of 800nm with 2-3W averaged power, How long we can do that without any destruction (100ms we have to do at minimum)  - how long we have to switch of the beam after that?

How we should test the change of the mirror by heat-up the mirrors? What are the 100femtosecond laser parameter we can use at maximum? Is it possible to get another mirror type and safety glass - working with expanded 100 fs laser beam - 800nm wavelength / 80MHz and 2-3W averaged power -> for example dielectric mirrors or silver mirrors?

  • 0
    TI__Mastermind 28005 points
    Frank,

    Welcome to the E2E forums, and thanks for your interest in our DLP technology.

    Which chipset are you interested in using, and what is the wavelength of the laser you intend to use?

    Best Regards,
    Philippe Dollo
  • 0 in reply to Philippe Dollo
    Prodigy 20 points

    Hi Philippe,

    we are using DLP 0.3 WVGA chipset. I found out that the mirrors have an alluminium layer - that means they have a absorption of 10-15% in the wavelength range of 750nm-900nm, we have to work for 2 photon excitation. Therefore my question, there are expierince with destruction of mirrors by using a expanded, (laser beam diameter: 1cm) 100 femtosecon laser beam with 80 MHz pulse repition rate (intensity of expanded beam: 375kW/cm2)? We believe, we can not compare the pulsed laser power (average power 2-3W) with the same continous wave laser power of 2-3W, because pulsed laser have better cooling by surrounding. Do you have any idea, what is the maximum average power we can give on the mirror array? Do you know there are another ligthcrafter mirror arrays (other mirror layer: silver or dielectric laered), which we can use?

    best regards

    Frank Garwe

  • 0 in reply to Frank Garwe
    TI__Mastermind 28005 points

    Frank,

    I'm working with one of my colleagues to try to get you in touch with one of our systems experts who may be able to better assist you on this matter. Thanks for your attention. Please accept my friend request on E2E for further assistance.

    Best Regards,
    Philippe Dollo

  • 0 in reply to Philippe Dollo
    TI__Mastermind 22840 points
    Hi Frank,
    Thank you for your patience. Please understand that described scenario is not a typical use case for DLP technology. We have not done any testing for this use case.
    We only performed simple paper calculation. We estimated rise in mirror temperature due to short pulse and also total energy load on the device. Looking at these two factors, we believe that DLP3000 DMD (.3 WVGA) device will withstand this exposure.

    We do not have specific test data under the conditions described, so it is important that you perform system level test these conditions to ensure reliable operation of the DMD.

    We only offer DMDs with aluminum mirrors. Silver or dielectric coated mirrors are not available.

    I hope this answers your question.
    Regards,
    Vivek