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DLP6500FYE: DMD: reflection losses in the near IR

maja colautti
Prodigy 10 points
Part Number: DLP6500FYE

I am Maja Colautti from LENS in Florence, and I would need some technical details on the DMD devices, that we may want to buy.

Rather then in refresh rates and pixel density, we are interested in the mirrors' losses. 
- We work at 785nm and as first point I would like to know if you have products which are optimized in this range.
- In case you do, could you please send me the specific losses at our wavelength? In particular, which are the reflection losses?
I have seen that all the mirrors are in aluminium (is this right), which is not optimal for our wavelength. Silver would be much better for us. 
- Is there a specific reason why you prefer aluminium? 
- Is there the possibility to have a DMD optimized for our wavelength, and could you eventually send me the relative quotation?
Thank you,
Best regards,
Maja Colautti
  • 0
    TI__Intellectual 1080 points

    Hi Maja Colautti,

    I will discuss this with my team and get back to you?

    Thanks

    Sachin

  • 0 in reply to Bhatta
    TI__Intellectual 1080 points

    Hi Maja Colautti,

    Our visible DMDs are typically specified for operation from 400 nm to 700 nm or from 420 nm to 700 nm.   We also have devices specified for the 700-2000 or even 2500 nm region.

    The window transmission of the different DMDs are in  document http://www.ti.com/lit/pdf/dlpa031.

    Yes, the efficiency of aluminum drops between 700-900 nm.  However, we do not make custom DMDs and therefore we do not coat the mirrors with silver.

    At 785 nm, the highest efficiency DMDs would likely be the DLP4500NIR or the DLP2010NIR devices.  (Both Pico Light Control devices).   However, this selection criteria refers to DMD efficiency only and does not take into account system optics f-number, DMD resolution, DMD area/etendue, pattern rates, and other capabilities of the DMD and its controller.

    You can also refer to the Optical Efficiency app note http://www.ti.com/lit/pdf/dlpa083

    It covers all major factors for DMD efficiency

    You must also note that diffraction losses are the largest source of loss, and can vary significantly with wavelength and optical design

    Thanks

    Sachin