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The radius of curvature of the fiber laser lens
Posted on:
2021-09-28
The radius of curvature of the fiber laser lens, I believe many of you here don’t know the fiber laser lens very well. The lens is an object that can magnify and reduce the refraction of light. It is generally used in the optical field, such as car lights, flashlights, and wall washing. Lights, LED lights and other fields. For many people who don’t understand the radius of curvature of the fiber laser lens when asking questions on the Internet, we will explain it to you today.
What is the radius of curvature of the fiber laser lens?
The front and rear surfaces of a fiber laser lens are curved. The two complete surfaces at the front and back are equivalent to a part of a spherical surface. Then the spherical surface must have a radius. This radius is the radius of curvature of the lens, which is usually divided into the front and rear surfaces. The radius of curvature.
The relationship between the focal length of the fiber laser lens and the radius of curvature
Assuming that the curvature radii of the front and rear surfaces of the lens are r1, r2, the center thickness of the lens is d, and the refractive index of the material used for the lens is n, then the object focal length of the front surface is f1=-r1/(n-1), and the phase focal length is f1' =nr1/(n-1), the object focal length of the back surface is: f2'=nr2/(n-1), the phase focal length is: f2'=-r2/(n-1), and then the total focal length is: f'=-f1'*f2'/(d-f1'+f2). The object focal length is equal to the negative focal length.
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