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Why is there a difference of wavelength range between DLP4500NIR chip and DLP® NIRscan™ Evaluation Module (which actually contains a DLP4500NIR chip inside)? Can I use this EVM for 850nm if I remove the light source?

Junling Long
Prodigy 100 points
Other Parts Discussed in Thread: DLP4500NIR

Hey,

    Our lab is gonna buy a DMD for modulating our laser beam. We want to use it for 850nm laser. The chip satisfy our requirement is DLP4500NIR, which has a wavelength range of 700-2500nm. To get the control circuit, we plan to buy the DLP® NIRscan™ Evaluation Module which actually contains a DLP4500NIR chip inside. But the wavelength range for this EVM is 1350-2450nm, which does not include the 850nm. I wonder if it is caused by the light source inside the EVM (if it has). Can we still use it to modulate the 850nm laser if we remove the light source? Thank you very much!

Junling

  • 0
    TI__Genius 12325 points
    Hi Junling,

    The the 1350 - 2450 nm was a design choice when we created the NIRscan. This is set by the optical engine design. As mentioned in the user's guide (www.ti.com/.../dlpu016), there is 1300 - 2500 nm bandpass filter in the engine.

    We will follow up with more design considerations if you would like to modify the NIRscan for your application.

    Thanks,
    Clinton