How does a Fresnellenswork

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Due to the design of the Fresnel lens, this lens can produce individual light patterns. Fresnel lenses can have an unlimited combinations of light patterns in it’s design. In today’s world, Fresnel lenses are commonly used in solar applications. This is because of the lens’ ability to concentrate light onto a heated surface. If you have a solar panel unit to heat your home or your pool, your solar panel system likely uses a Fresnel lens.

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While originally made of glass, the Fresnel lens can be found in a large variety of substrates and sizes. Nowadays, Fresnel lenses are made of plastic because of the lightweight traits of plastic compared to glass.

Fresnel lenses are lenses composed of a series of concentric rings. The Fresnel lens construction design allows for large aperture and short focal length with less mass and volume compared with a conventional lens design. Fresnel lens were invented by French physicist Augustin Jean Fresnel (1788-1827) and used in lighthouses all around the world. Since then it has been used in applications for light collection, light collimation and magnification. Today a common application that you will find a Fresnel lens in is a magnifying glass. You will likely find Fresnel lenses in detector operations, condenser systems and emitter operations. However, you can also find Fresnel lenses in devices used for illumination.

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With a Fresnel lens, the conventional optical lens is replaced. This is because the Fresnel lens’s contour can refractive surfaces more efficiently than a conventional optical lens. In other words, the Fresnel lenses are designed to manipulate parallel light rays and focus them in a common area. The three main ways that a Fresnel lens can be used are for: • Magnification • Light collection • Light collimation Even though the Fresnel lens is a lot more narrow than other types of lenses available, they can focus light a lot more efficiently than conventional optical lenses. Also, Fresnel lenses don’t scatter light across surfaces. This means that most of the material used in a Fresnel lens can increase the absorption of light upon the object that’s being looked at.

I'm asking in general how to collimate it, but my idea was use a parabolic mirror, then focus all wavelengths into a very short optical fiber, then get the light back into vacuum. Would this work? Is there a better way?

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Good lasers have Gaussian beams. Gaussian beams are never perfectly collimated, but larger diameter beams have a small beam divergence. To get a larger diameter beam, use a beam expander.

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There are some details, each wavelength will travel at a slightly different speed through the fiber due to waveguide dispersion and material dispersion.

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Each wavelength will have a little bit of chromatic dispersion due to the lens, unless you choose to use a special lens.

For wavelength division multiplexing your 100 different wavelengths could each be produced by an individual laser. They could then be sent through a single mode optical fiber and then your could collect the light coming out of the optical fiber. That ligh does each wavelength will be fairly nice almost Gaussian spot that will diverge. You could put a collimating lens where the spot is 5 mm and get a collimated beam. It would act pretty much like a Gaussian beam.

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These lenses magnify the image at 10X power. The power of the ocular lens multiplied by the objective lens gives the total magnification of the microscope. 2.

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But in the big picture, if you start out with a nice beam, you can usually use a lens or a set of lenses to collimate the beam, and each wavelength can be treated as a slightly different problem.

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If instead you have incoherent light, rather than having nice electromagnetic modes to propagate, it is a little different. For example you wouldn’t get much light into the single mode optical fiber. But you could do something like put two apertures separated by a distance and have a roughly collimated light. The diffraction angle will depend slightly on the wavelength, but could still put a lens or set of lenses to expand or focus the light or to collimate the light. Same as before the chromatic aberration of the lenses and type of lenses can matter some, but big picture it would work.

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Before collimating, the beam will have diverged a bit to a radius of 5cm, the range of the wavelengths is 1400-1600nm and I don't want to lose more than 30% of initial power.

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Fresnel lenses were initially produced by hand grinding and polishing glass. The manufacturing process was tedious and later evolved into molten glass poured into molds. In the 20th century, optics quality plastic and injection-molding were used to produce commercial applications. Fresnel lenses can be manufactured from a variety of substrate such as acrylic, polycarbonate or vinyl.

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