Plano-Concave Cylindrical Lenses | EKSMA Optics

• Expand light in one dimension only
• Ideal for scanning and projection

These lenses are used in laser scanners, spectroscopy, dye lasers, acousto-optics, optical processors and other similar applications. They are the best for circularization of diode laser outputs. Earlier remarks made about plano-convex and plano-concave spherical lenses, with regard to aberrations and conjugate ratios, are also applicable to cylindrical lenses.

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Additional reading:
Cylindrical Lenses | Laser Focus World

A variety of anti-reflection coatings is available for these lenses. For appropriate coating please refer to the COATINGS section. We can supply custom cutting, edging, coating or complete fabrication if required.  

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Hi all,

I am implementing a lab activity for a 2 lens set-up that will serve as a simple telescope.

In the teacher's manual, it lists down 2 plano-convex lenses, with the 2 curved surfaces facing each other. The plane faces will respectively face the light source and the observer's eye.

A simple net search shows that regardless of which side (i.e. plane or curved) of the planoconvex lens is facing the light source, the point of convergence of the light rays will be the same on the opposite side of the lens.

Which then begs the following 2 questions, what then is the key difference(s) between a plano-convex lens and a biconvex lens? Will my 'telescope' fail to work if i use 2 biconvex lens instead?

Thanks in advance. Physics Forums rock! What's written here is correct in many cases, but it is dependent on what your application is:

1. If your 'telescope' is for imaging distant objects:

In this case the object is near infinity and the incoming field can be considered nearly collimated. Plano-convex lenses are best, with flat surfaces facing the inside of the telescope. The goal is to have both sides of the lens active in deviating the light direction.

2. If your 'telescope' is being used for image relay of small, nearby objects about a focal distance away from the lenses:

Plano-convex is fine, but the flat surfaces should now be facing outward. If the magnification of this image relay system is close to 1:1, then the use of biconvex lenses will eliminate most abberation. If the magnification is far from 1:1, then biconvex lenses will make things worse.

In any case, orientation and use of plano-convex vs. biconvex lenses won't matter terribly much. You will still form a fine image so long as the lenses are the correct distance apart. These details only affect small distortions in the image.