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DLP used to modulate the phase of a laser beam (for cold atoms)

Citlali Cabrera
Prodigy 10 points
Other Parts Discussed in Thread: DLP5500, DLP2010NIR, DLP4500NIR, DLPC200, DLPA200
Hi, my name is Citlali Cabrera and I work at Laboratoire des Collisions, Agrégats et Réactivité. We work with cold atoms and we are going to build an experiment soon where we need to modulate the envelope of an optical laser (two counter-propagating laser beams). We need to be able to apply phase modulations of at least 2 pi. We've heard about DMDs and their application to this kind of modulations, so we would like to have more information on this device. (In particular, we read a report where a DLP5500 was used).

For our experiments we will use a laser at 1064 nm, with a power going from 5 up to 15 W. We use a continuous laser, which should fall on the DMD during 100ms to 1s, in every cycle (a total cycle lasts about 20 seconds)

We would like to have the following information on your device to see if it could be used in our experiment:

- is it possible to use it to have a phase modulation of 2 pi at 1064 nm?

- what is the damage threshold of such a device?

-what's the pixel size (micro-mirror size) and what's the size of the whole active area?

- since the device contains mechanical elements, we would like to know what the stability of those elements is and how long can it be used before we face any mechanical problems?

- if I understood correctly, it is possible to obtain different values of phase modulation by modifying the time the mirror spends in each of the two possible states. At what frequency do these modulations/oscillations take place? (what's the typical value?)

Could you send us a datasheet of this device and a cost estimate please?
And finally,if we decide to buy one DLP, who long will we have to wait to get it after ordering it?



Kind regards,

Citlali Cabrera

  • 0
    TI__Expert 6370 points

    Hi Citlali,

    I apologize for the delay. We saw your question and find it very intriguing, but my colleague was on travel this past week. He should be able to get back to you tomorrow.

    In the meantime, our products can be found on this page. There, you will be able to sort the parts by wavelength range, micromirror pitch (pixel size), and a number of other variables.

    We currently offer two DMDs which operate at the wavelength you mentioned, 1064 nm, the DLP4500NIR and the DLP2010NIR.

    Check out the datasheets on the DMD pages to find information on physical characteristics, optical characteristics, and maximum illumination as you asked about, which varies from DMD to DMD. To find information on pattern rates (how quickly the DMD can be switched), you should also check out each DMD controller - which varies based on DMD, but is also linked on the DMD page.

    As I mentioned, my colleague will get back to you tomorrow on your application.

    Best regards,

    Trevor

  • 0
    TI__Guru 54705 points

    Hello Citlali,

    First welcome to the DLP Advanced Light Control section of the TI-E2E community.

    I am not certain that I understand completely how the DMD is being used.  It is not inherently a phase modulator.  Could you give a reference to the paper you read regarding using the DLP5500?  This will help in answering your question.

    Please be aware that the DLP5500 device requires a DLPC200 controller and a DLPA200 analog driver to operate. 

    My recommendation is that you purchase a kit that has all of the electronics already built up from one of our distributors.  DLi makes a CEL5500 [http://www.dlinnovations.com/products/modular-light-engines/cel5500-light-engines/] which you can start with.  Otherwise you will have to build your own boards to make the system work.

    The datasheet for the DLP5500 can be found here:  http://www.ti.com/lit/gpn/dlp5500 and pricing here: http://www.ti.com/product/dlp5500/samplebuy (the price is per 100 units and the minimum order is 5 units).  You can check Mouser to see if the will sell just one.