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Image diameter from infinity corrected objective

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Image diameter from infinity corrected objective

Postby pliskin1911 on Wed Sep 11, 2013 10:00 pm

Hi, I had a couple of questions I was hoping someone here could answer. I am building my own scanning microscope and important aspect of the microscope is that it needs to send the light from the objective to a beam-splitter and then onto a silicon photo detector (so up through the focusing end and out the rear aperture).

1. Do I need to focus the light before the detector? Since the objective is infinity corrected and has only parallel beams exiting the rear, does that mean that the largest spot size will be the diameter of the exit aperture? Further, if the total detector diameter is larger than this(the objective rear aperture) wouldn't it mean that focusing the beam before the detector is unnecessary?

Another important aspect, and somewhat related is attaching a CCD/cmos camera for viewing the specimen. I have the tube lens at the correct distance from the rear of the objective and the camera the correct distance from the tube lens, but I'm unsure if I will need to focus the light before the camera, similar to the detector. I guess the answer to question one will likely take care of this as well but anyway:

2. Does the light from the tube lens need to be focused for the camera? If the beam from the rear of the objective is smaller than the camera area will this be sufficient or will the tube lens make the beam larger somehow?

Thanks a ton!
pliskin1911
 

Re: Image diameter from infinity corrected objective

Postby Steven_L on Thu Sep 12, 2013 12:41 pm

You will have to speak with a microscope manufacturer to try to get your questions answered, not a retailer, even with lots of experience. Good luck.
Aim Hard!

Steve at OpticsPlanet
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