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DLP9500UV: The 380nm laser does not work properly on this product

wuji yang
Prodigy 10 points
Part Number: DLP9500UV
Other Parts Discussed in Thread: DLP9500

Tool/software:

The DLP 9500 product(Vialux V-9501 UV) is suitable for the laser band from 363 to 420nm, but I use the 355nm and 405nm wavelength lasers at a 24° angle, the brightest reflected spot appears in the center, it works fine, but with the same angle of 380nm laser, its reflection angle changes a lot, and the main order spot disappears, I want to know what causes this phenomenon and how we can avoid this problem.

380nm laser irradiation

355nm laser irradiation

 

  • 0
    TI__Guru 54705 points

    Hello Wuji,

    This is the result of diffraction due to the interaction of the pixel pitch and the wavelength.  Please see this App Note:  https://www.ti.com/lit/wp/dlpa037a/dlpa037a.pdf 

    It looks like at 380 nm the system is in a nearly perfect "anti-blaze" condition.

    Fizix

  • 0 in reply to Fizix
    Prodigy 10 points

    Thank you for your answer, but the result of the 380nm wavelength seems to be too perfect to meet the half-wave condition, and the 380nm wavelength is also within the suitable band of the DLP 9500, so I think the design of the DLP9500 may take into account the 380nm wavelength and adapt it, maybe there are other reasons

  • +1 in reply to wuji yang
    TI__Guru 54705 points

    Hello Wuji,

    Within the wavelength range there are several blaze and anti-blaze conditions as you go from 363nm to 420nm.  I have been doing diffraction studies for a long time and the images show classic diffraction patterns for blaze (355nm) and near anti-blaze (380nm).

    The range only inidacates the range for which the AR coatings are suitable.

    =Fizix