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Optical components needed for illuminating DLP Lightcrafer DMD chip with and an external Laser source

vahid kushcu
Prodigy 20 points

Hello 

 

I am a graduate student and I would like to use DLP Lightcrafter in a confocal microscopy project. I have successfully dissemble light engine of one DLP chips and used an external  523 nm green laser source to illuminate the DMD chip.I used a beam expander after laser to make sure the whole surface of the DMD chip was illuminated. I have not used a beam shaper so my illumination is not uniform. I just put the DMD chip with 24 degrees respect to microscope optical axis and in the image plane of the microscope. Now I can see the patterns of the DMD on the objective(40x NA=0.55) focal plane but I was losing lots of mirrors, diffraction was too much and the quality was not good.

 

 I have seen some papers in which the DMD chip was used in microscopy research however optical setup were not well described. I also saw some useful discussions about what were optical components inside DLP lightcrafter and DLP 4500 which gave me some idea about the design.

https://e2e.ti.com/support/dlp__mems_micro-electro-mechanical_systems/f/850/t/162664 

https://e2e.ti.com/support/dlp__mems_micro-electro-mechanical_systems/f/924/t/278008

 

However there are some question on my mind regarding this issue.  My questions are followings:

 

1. Was any TIR prism used in DLP lightcrafter light engine (I could see that a TIR prism was used in DLP 4500 light engine but I could npt see that in DLP Lightcrafter light engine)? Is using a TIR prism necessary?

 

2. What is the functionality of the lens just after the tilted mirror and right in front of the DMD 3000 chip? Is it a condenser?(In DLP 4500 light engine there was not any lens in front of the DMD chip and there was a TIR prism).

 

3. In both light engine micro lenses were used so I am thing of a using a micro lens for that purpose. Is this Thorlabs lens for this application? https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=2861 or 

 

4.Should I use a condenser lens just in front of the DMD?

 

I am sorry for asking too many questions. I would appreciate your kind reply.

 Thank you very much in advance.

Vahid.

  • 0
    TI__Genius 13235 points
    Hi Vahid,

    We have a similar post about the LightCrafter light engine to the one you found for the LightCrafter4500. I included a link below. Let us know if this thread clears up some of your questions.

    e2e.ti.com/.../162664

    Thanks,
    Clinton
  • 0 in reply to Clinton Rodgers
    TI__Genius 13235 points
    Hi Vahid,

    I believe you may have already seen the link I included above. However, your link to this post is broken. We'll be taking a look into your additional questions. Please allow a couple days for feedback.

    Thanks,
    Clinton
  • 0 in reply to Clinton Rodgers
    Prodigy 20 points
    Hi Clinton,

    Thank you very much for your reply. I have seen that post related to DLP lightcrafter Light engine components and it was so helpful. As I mentioned in my questions in that post for DLP LightCrafter I could not see any TIR prism and I did not know the function of the lens in front of the DMD chip. MOreover, I started to work on the setup if there is any improvement I will post here maybe it would be useful for other members. I am also looking forward to hearing from you.

    Than you,
    Vahid.