Winlens lab instructions

The fiber ends should be very close to the spheres, in other words, let the object
distance be small (fractions of a millimetre). Your objective is to maximize the
coupling efficiency by imaging the end of the first fiber onto the end of the
second fiber. Due to spherical aberration, the image spot in the Gaussian image
plane is large. Reduce the size of the spot by compensating as much as possible
with defocus on the image side. (You find Defocus on the Options menu.) Check
the result with Spot Diagram and Spot Diagram Summary.
Report your results, with your own comments, a printout or snapshot of the
System Parameters, and a printout or snapshot of the screen containing at least
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Main Parameters
Lens Drawing
Paraxial Values at mid wave
Surface by Surface.
4. Reverse engineering
In this exercise you are going to design the optics of the simplest of all cameras,
a disposable one-lens camera. You can find the information you need from the
pictures below.
Before continuing, make sure to restore the wavelengths to visible light. You
can find default settings for visible light in the Default Wavebands dropdown list
on the Waveband tab of the System Parameter Editor.
In Figs. 3, 4 and 5, the lens of the camera is shown. Make an estimate of the lens
diameter and the radius of curvature of the convex surface of the lens. The
estimates do not have to be accurate - they are merely intended as a starting
point for you to optimize from. As can be seen from the pictures, the lens is of
the meniscus type. The radius of curvature of the concave surface is difficult to
estimate, but it has to be larger than that of the convex surface. (Otherwise, the
lens is negative, and will not form a real image.)