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DMD's for NIR

Danilo A.
Mastermind 28720 points
Other Parts Discussed in Thread: DLP2010NIR, DLP650LNIR, DLP4500NIR, DLP2010

Hi Team,

A customer has inquiries about DMD for NIR application. Here are the details of his inquiries.

We are designing a DMD based spectrometer for near infrared region. We have found the following DMD chips for NIR region: DLP650LNIR, S450 0.55", DLP4500NIR, DLP2010NIR.

The wavelength band we are using is max. 750nm - 1700 nm, mostly part of that range.

- Do you have other DMD chips suitable for NIR, particularly with orthogonal tilt similar to DLP2010NIR but larger DMD matrix area?

- Do you have more information available about stray light properties of DMD chips in NIR region?

- We would prefer maximum available contrast and stray light suppression instead of high reflectivity or high laser power tolerance. Do you have any versions or batches of DMD available for NIR which would be optimized for high contrast?

Regards,

Danilo

  • 0
    TI__Genius 9971 points

    Hi Danilo,

    I will discuss about your queries within our team and get back to you soon.

    Thanks and regards,

    Mayank

  • 0 in reply to Mayank Khandelwal
    TI__Mastermind 23070 points

    Hello Danilo,

    Please find my response to your questions:

    We are designing a DMD based spectrometer for near infrared region. We have found the following DMD chips for NIR region: DLP650LNIR, S450 0.55", DLP4500NIR, DLP2010NIR. The wavelength band we are using is max. 750nm - 1700 nm, mostly part of that range.

    => TI offers only these three DMDs for NIR wavelength. DLP650LNIR is has largest active array area and it also has the square pixel (Manhattan).

    - Do you have other DMD chips suitable for NIR, particularly with orthogonal tilt similar to DLP2010NIR but larger DMD matrix area?

    => DLP650LNIR is a orthogonal pixel , however ,it is corner illuminated (illumination at 45 degree).

    - Do you have more information available about stray light properties of DMD chips in NIR region?

    => Could you please help us understand what you mean by stray light proprieties of  DMD? If you mean diffraction efficiency, then it will depend on the pixel architecture/node.  It will be different for all these three DMDs because all them of use different pixel node.

    - We would prefer maximum available contrast and stray light suppression instead of high reflectivity or high laser power tolerance. Do you have any versions or batches of DMD available for NIR which would be optimized for high contrast?

    ==> The contrast depends on the overall system design rather  than DMD only.  The over all system level contrast will depend on the F/# of the optics and how stray light  is managed. For your reference, in a well designed optical system based on DLP2010 DMD, our customer are able to achieve 2500:1 contrast ratio with F/2.5 optics.  Using same DMD, for a optical system designed with F/1.7 optics, the contrast ratio will be bellow 1000:1.   As you could see the system design a much bigger impact on the contrast ratio rather DMD only.

    regards,

    Vivek