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DLPLCR4500EVM: TIR PRISM

Tommaso Galgani
Prodigy 50 points
Part Number: DLPLCR4500EVM
Other Parts Discussed in Thread: DLP4500,

We are currently use this module on a fluorescence microscope, in particular we are using the DLP4500, DLP® 0.45 WXGA DMD for shaping our excitation lasers
We have 4 different lasers on our setup, at 405 488 560 and 640 nm wavelength

I have noticed that the TIR prism that comes with the module is able to overlap the optical path of the 488 and 640 nm, but not the 405 and 488. When the prism is not in place the different wavelengths are reflected at different angles. I guess this comes from the fact that the DLP® LightCrafter™ 4500 module is designed to work with RGB light. Can you confirm this?

My question is: could you provide custom-made prism working at different wavelengths, that on our setup would overlap the reflection of our lasers?

  • 0
    TI__Genius 10925 points

    Hi Tommaso, 

    Welcome to TI E2E Forums! Kindly note that optical path on LCR4500 EVM is optimized visible RGB lights only. So using 405 nm light may not get steered properly through the optical path, and also may lead to decrease in efficiency. Also, the optical engine for LCR4500 is designed by SHENZHEN ANHUA OPTOELECTRONICS. You can contact them for further information about custom optical modules.  

    Thanks & Regards,

    Hirak.

  • 0 in reply to Hirak Biswas
    Prodigy 50 points

    Hi Hirak,

    My question was more about the TIR prism, because I have noticed that, with the prism in place, the reflection of 488 nm and 640 nm lasers overlap on the same optical path, but not the 560 nm. I guess this depends on the fact that 560 nm is not proper green light for which the prism is engineered. Can you confirm this? If this is the case, can you tell me if you can provide a dedicated prism for this wavelengths? Or, in case the prism is developed by a second company, could you tell me who to contact please?

    Thank you in advance.

    Tommaso

  • 0 in reply to Tommaso Galgani
    TI__Genius 10925 points

    Hi Tommaso, 

    All parts of the light engine including the TIR prism is designed by Anhua Optoelectronics (http://www.anhuaoe.com/en/), and are designed for Visible Light only. You can contact their customer support for further details about the optical engine. 

    Thanks & Regards,

    Hirak.

  • 0 in reply to Hirak Biswas
    Prodigy 50 points

    After our previous exchange I contacted the company Anhua Optoelectronics as you suggested:

    Hirak Biswas said:
    All parts of the light engine including the TIR prism is designed by Anhua Optoelectronics (http://www.anhuaoe.com/en/), and are designed for Visible Light only. You can contact their customer support for further details about the optical engine. 

    Here is part of the answer I got:

    Dear Tommaso

     
    We are in receipt of your email dated 6th April , thanks for contacting us .
     
    We are designer and manufacturer of the optical engine .
     
    We do not make prism .
     

    Apparently they don't produce the prism. Can you give more precise feedback for my problem?

    Thank you in advance.

    To Institut Curie：prism for DLPLCR4500EVM
    cathyzeng <cathyzeng@anhuaoe.com>
     
    Reply|
    Yesterday, 3:56 AM
    Galgani Tommaso;
    '安華AnHua-Lucy龔珍 ' <lucygong@anhuaoe.com>;
    +1 more
    the introduction of anhua-2020.3.24.pdf11 MB
    anhua 2019 new products plan-20190715.pdf864 KB
    2 attachments (12 MB) Download all 
    Action Items
    Dear Tommaso
     
    We are in receipt of your email dated 6th April , thanks for contacting us .
     
    We are designer and manufacturer of the optical engine .
     
    We do not make prism .
  • 0 in reply to Hirak Biswas
    Prodigy 50 points

    Dear Hirak, after our exchange I contacted Anhua OE and here you can find their answer: 

    Dear Tommaso
     
    We are in receipt of your email dated 6th April , thanks for contacting us .
     
    We are designer and manufacturer of the optical engine .
     
    We do not make prism .
     

    They are not the manufacturer of the prism. Can you give me more precise feedback regarding my problem?

    Thank you in advance

     

  • 0 in reply to Tommaso Galgani
    TI__Mastermind 22830 points

    Hello Tommaso-san,

    Please refer to the the following thread on the forum:

    https://e2e.ti.com/support/dlp/f/94/t/278008?A-look-inside-the-iView-Engine-in-LightCrafter4500

    This post explains  inside of the optical engine (previous version) used in the DLP4500 EVM.  I guess the current optical  engine will be similar in layout. TI sources complete optical engine and we do not  have specifications for the internal components.

    The wavelength selection/filtering is not done by prism. You would notice there are "dichroic filter/mirrors" marked in the diagram. These filters are designed to pass specific wavelength and reflect  others. 

    Assuming, the current engine has similar LED layout as one in this post. The dichroic mirror/filter in front of the blue led is designed (based on LED specification) to pass 450 nm to 465 nm. It will reflect back all other wavelength.

    When you replace blue LED with  405 and 488 laser in the path, this mirror reflects it back. The light never enter the optical path.

    You need to replace this dichroic with new one which passes all wavelength bellow 490nm and reflects rest.  This change will allow  405 nm and 488 nm wavelength to enter the optical path.

    Hopefully, this will fix your issue. After you have replaced first dichroic and light is still not reaching DMD then the second dichroic may be a notch filter and preventing any light bellow 450nm from passing through.  It is done to prevent any UV light reaching the DMD. 

    In that case, you also  need to  replace second dichroic and new filter should reflects wavelength above 560 nm and pass remaining.

    Please understand TI does not make or sell optical components. There are several suppliers of dichroic filter and you should be able to order directly with them. A simple web search gave me following company:

    https://www.alluxa.com/optical-filters/ultra-series-optical-filters-and-coatings/dichroic-filters/

    The optical engine manufacturers are set-up for volume production and may not able able to support special request like this. In case, you  need external help then your best option is to work with one of the design houses supporting DLP.

    http://www.ti.com/dlp-chip/advanced-light-control/optics-electronics/design-service-providers.html

    regards,

    Vivek