collimation Definition and 14 Threads

Light from the sample is collimated light. For imaging, does the spectrometer requires a lens to focus the collimated light on the entrance slits of the detector. Using the beam splitter, the collimated light from the sample is directed toward the spectrometer. Previously, we used a lens to...

Goodmorning, I'm designing an unfolded Czerny-Turner spectrometer like the one in picture I'm trying to use toroidal mirrors to decrease off axis astigmatism. In my first try i made an optimal off-axis collimator (Mirror 1), a mirror that has a good collimation in both the planes: the plane...

I am using 2 lenses in a 4f configuration. The input is a large collimated beam (632nm). After passage through the 2 lenses the beams vertical dimension remains constant, however, the horizontal dimension get smaller, as if it is being focused only in the horizontal direction. Does anyone have...

Ok so if an object is placed at the focal point of a convex lens, it will have it's rays collimated -- which I assumed to mean that all rays would end up parallel to each other. But then, I saw this diagram of a simple compound microscope from Hecht "Optics" 5th ed: And I noticed that all...

Please help me in understanding the function of anode. As in image attached you see, once the electron beam is emitted from cathode and filtered by grid, it enters into the one or series of anodes. As anode is positively charged, so, to my understanding it has no electric field inside its hollow...

Hello! If one were to push uncollimated light through a tube of inner radius R and length L, coated with matte black - the maximum incidence angle it will allow through would be ATAN2(R, L). On the other end of the tube, only the "most collimated" fraction of light would exit - a very small...

How useful are collimation eyepieces? I wouldn't shell out the money for a laser collimator, but some of the eyepieces (like this one) are as cheap as $30, and appear to work very well. My scope came with a collimation cap, but even after trying to collimate my telescope, I'm still not sure...

Hi all, my question is not strictly related with physics and I don't know if it is the right section. Anyway I have a problem with a collimator: I need 100micron (or maybe smaller) collimator, but the high energy (60-70 MeV) of the beam need a material which is at last 5mm thick, (tungsten...

Hi, I have been stuck on a project that I am working on. I am trying to collect light using optics from a FOV of 200x200mm at 200mm distance. I have two major problems: 1. My detector is small so I need to collimate the light (my application is not imaging so I don't worry about the...

Can someone please explain why the synchrotron radiation is very collimated? not only with equations and not only with words, both please. But anyway any efforts is really appreciated :) Thank you

Hello everyone, I am trying to test the collimation of light emerging from an off-axis parabolic mirror. My mirror has a diameter of 0.5m or so. The focal length is about 5m. The light source I am using is a red laser focused at a pinhole. To test the collimation of this point source, I am...

I have a 12" Zhumell Dobsonian and I've been trying all day to collimate it and can't get it lined up right. This is what it looks like when peering into the eyepiece holder: http://img184.imageshack.us/img184/4786/christmasscope008dx6.jpg Can anyone tell me if this is a secondary mirror or...

HI, I am thinking of how can i focus and make a home made collimation to an IR beam. I have a lens and an IR-led mounted to a center of a focal point. But its hard to collimate the beam properly without visual sight to IR. B/w-video cams are usually lit with a series of IR leds to have enough...

I need a collimation material that is faily cheap and has a reflectivity of about 95% for both infrared and visible light. I know polished aluminum meets the criteria for the infrared, and the fused silica also works well for the visible spectrum, but I need somthing that can collimate both.