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So many views and no suggestions? Please help ??

Hello engineers, I am struggling with this seemingly simple problem and I was hoping to get some directions. Please look at the attached figure. I have a small chamber with a tube (radius=3mm) that is connected to a vacuum pump. The pump operates at -600 mmHg. The chamber is filled with air at...

I understand that the light traveling through free space will not interact too much with the surrounding light. I am mainly talking about the light within the imaging system. How is the light traveling "toward" the specimen is distinguished from that returning "from" the specimen? Why do photons...

I think my confusion stems from lack of clear understanding of light transport at quantum level. Generally, I do not know what happens when two beams travel in along the exact same path in the opposite direction. Do the photons traveling toward each other never collide ? Is there never a...

In several fiber-optic-based probes in medical imaging fields, the light travels towards an object through an optical fiber (or even free space), interacts with the object and then travels back through the same fiber (or the same path in free space) and is captured by a camera or photodetector...