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Max power onto DMD Discovery 1100.

Xiongfeng Zhu
Prodigy 75 points
Other Parts Discussed in Thread: DLP7000

Hi

We are planning to use DMD Discovery 1100 for 355 nm laser. In the data sheet it says max power for dmd 1100 is 0.1 W/cm^2 for wavelength<350nm. But the laser we use will have the power ~5 W/cm^2. Does it mean DMD 1100 won't apply in our process?

Also the data sheet only has reflectivity for 420~700nm. What will be the reflectivity( or transmission) for 355nm? Because we need to calculate the loss to see if it's acceptable.

Thanks!

  • 0
    TI__Guru 54705 points

    Hello Xiongfeng,

    I regret to inform you that you are correct, that even for our Discovery 4100 UV 0.7 XGA DMD offering that 5 W/cm2 is greater than the allowed power density.  The Discovery 1100 system is not optimized for UV.  Therefore your evaluation is correct that the D1100 will not work for your process, nor will our UV DMD.

    Fizix

  • 0 in reply to Fizix
    Prodigy 75 points

    Thanks for your reply!

    So what's the max power I can probably have using DMD 1100? Is 1 W/cm2  acceptable? Or it can never exceed 0.1 W/cm2  as in the datasheet?

    Plus , is there an accurate value of efficiency for 355nm? I can only find data  for 420~700nm in the sheet.

    Thanks a lot!

    Xiongfeng

  • 0 in reply to Xiongfeng Zhu
    TI__Guru 54705 points

    Hello Xiongfeng,

    The Discovery 1100 system DMD was designed for use in the visible range.  We cannot guarantee operation in the UV with this part.  Overall optical efficiency is very dependent on system optics, so that we do not typically quote efficiencies. 

     For the DMDs in the visible when nominal optical efficiencies are given the are given as being dependent on 24° illumination (relative to the window normal), projection axis along the window normal, f/3.0 illumination aperture and f/2.4 projection aperture.  Please see the DLP7000 data sheet page 20 for an example.

    Fizix.