In a laboratory environment, a bare fiber end is coupled using a fiber launch system, which uses a microscope objective lens to focus the light down to a fine point.
12.
The best telescope objectives, and photographic objectives intended for three-color work, are also apochromatic, even if they do not possess quite the same quality of correction as microscope objectives do.
13.
:( 1 ) Largest aperture; necessary corrections are for the axis point, and sine condition; errors of the field of view are almost disregarded; example high-power microscope objectives.
14.
Where the numerical aperture is defined as \ mathrm { NA } = n \ sin \ theta \; for ? being the half-angle of the cone of rays accepted by the microscope objective.
15.
In practice, the most commonly used configuration is to use a microscope objective lens for focusing the beam, and an aperture made by punching a small, precise, hole in a piece of thick metal foil.
16.
Although the same microscope objective with a numerical aperture of 1.49 is used, it is clear that the confocal point spread function is more compact both in the lateral dimensions ( x, y ) and the axial dimension ( z ).
17.
In global imaging, the whole field of view of the microscope objective is acquired at the same time compared to point-by-point techniques where either the sample or the excitation laser needs to be moved in order to reconstruct a map.
18.
E . Abbe succeeded in computing microscope objectives free from error of the axis point and satisfying the sine condition for several colors, which therefore, according to his definition, were " aplanatic for several colors "; such systems he termed " apochromatic ".
19.
As I had already spent an hour diagnosing and fixing an issue that prevented their 40X microscope objective lens from focusing, and being several floors deep into their intimidating multifloor ( probably $ 7000 / mo rent ) basement apartment underneath an Upper West Side brownstone, I was struck with indecisiveness and intense anxiety when they gave me the textbook I would be teaching from.
