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DMD for laser beam shaping

Marco Benitez
Prodigy 50 points
Other Parts Discussed in Thread: DLP5500, DLP4500

Hi,

I'm looking the possibility regarding the use of MEMS DMD with at least a 7mm diameter visible laser for laser beam shaping/slicing. The system will be done to achieve a uniform beam width across given range of distance.

The DLPS3000 seems to be an option to do this. Then I saw the DLPlightcrafter kit  ( http://www.ti.com/tool/dlplightcrafter but half of it won't be needed since the light source would be a laser instead of the RGB LEDs.

I've also come across the forums like these ones but unsure about DMD/DLPs/MEMS:
http://e2e.ti.com/support/dlp__mems_micro-electro-mechanical_systems/f/94/p/183438/662866.aspx#662866
http://e2e.ti.com/support/dlp__mems_micro-electro-mechanical_systems/f/850/t/159950.aspx

So I would like to have some insights on this..
1) Is it practical to use the DMD/MEMs (DLPS3000 or lightscrafter kit) for this purpose?

2) Are there existing technology in TI that can do laser bream shaping/slicing?

3) Are there other ways to do laser beam shaping/slicing besides using DMD?

Marco

  • 0
    TI__Guru 54705 points

    Hello Marco,

    Sorry for the delayed response. 

    First let me clarify a few items.  The height of the DLP3000 active array is  ~3.7 mm, so I am not clear how you plan to fit a 7mm diameter beam on the surface unless you plan on using a reducer. 

    The DLP4500 is closer at ~6.2 mm and the DLP5500 is definitely there at ~8.3 mm.

    Do you mean that you wish to shape and truncate the beam or that you wish to shape and slice an object using a laser beam.  If you mean former, a DLP Digital Micromirror Device [DMD] ought to work.  If you mean the latter, I have concerns about the power density at the DMD arrary.

    For your questions, here are the answers we have to offer:

    1. This would be a practical application for a DLP DMD provided that you stay within the average power density recommendations for the DMD that you choose (assuming that you are shaping the beam not shaping a target object using the beam).
    2. We at DLP are not aware of other TI technologies designed for this purpose.
    3. It is certainly possible that there exist other technologies for this purpose but we have no familiarity with such technology.

    Fizix

  • 0 in reply to Fizix
    Prodigy 50 points

    Hi Fizix,

    Thanks for the response. That helped me narrow down the choice of DMD to use.

    I just noticed that most of your DLPs have specified 420-700 nm wavelength and only DLP4500 NIR have the best efficiency for wavelengths in 700-2000 nm. Also I read about having different coating of micro-mirros affects the efficiency of reflectance.

    I'm wondering if:

    1) TI does customization of micro-mirror coatings so that the DLP can take NIR light source and can be as physically small as DLP3000 or as big as DLP5500 and so on?

    2) there are other ways to do self-customization, say if I bought DLP3000, so that it can have high reflectance in the NIR wavelngths?

    3) the DLP4500 NIR the only DLP TI has that can handle NIR range really well?

    Marco