The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative Agreement NNX16AC86A

Field of viewmicroscope

Evolution of output power and gain when an Yb-doped fiber laser is switched on. One can see the relaxation oscillations, with convergence towards the steady state. Each red or gray segment corresponds to 0.2 μs.

Note that the working distance is not necessarily the same as the front focal distance. Even if the object is placed in a beam focus, that focus does not need to lie in the focal plane if the input light of the objective is not collimated.

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202487 — The field of view (FOV) refers to the extent of the observable world seen at any given moment through your camera lens.

In some cases, it may not be clear how exactly the mentioned distance is measured – for example, if some mechanical parts protude beyond the final lens. It should then be made clear what exactly is meant with the working distance.

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This paper presented a bicubic uniform B-spline wavefront fitting technology to figure out the analytical expression for object wavefront used in Computer-Generated Holograms (CGHs). In many cases, to decrease the difficulty of optical processing, off-axis CGHs rather than complex aspherical surface elements are used in modern advanced military optical systems. In order to design and fabricate off-axis CGH, we have to fit out the analytical expression for object wavefront. Zernike Polynomial is competent for fitting wavefront of centrosymmetric optical systems, but not for axisymmetrical optical systems. Although adopting high-degree polynomials fitting method would achieve higher fitting precision in all fitting nodes, the greatest shortcoming of this method is that any departure from the fitting nodes would result in great fitting error, which is so-called pulsation phenomenon. Furthermore, high-degree polynomials fitting method would increase the calculation time in coding computer-generated hologram and solving basic equation. Basing on the basis function of cubic uniform B-spline and the character mesh of bicubic uniform B-spline wavefront, bicubic uniform B-spline wavefront are described as the product of a series of matrices. Employing standard MATLAB routines, four kinds of different analytical expressions for object wavefront are fitted out by bicubic uniform B-spline as well as high-degree polynomials. Calculation results indicate that, compared with high-degree polynomials, bicubic uniform B-spline is a more competitive method to fit out the analytical expression for object wavefront used in off-axis CGH, for its higher fitting precision and C2 continuity.

The relationship between magnification to object distance is inverse. 3. How is magnification related to image distance (proportional, inverse, etc.), and at ...

Parfocal length

The working distance of an objective is the distance between the objective and the object. That quantity is relevant in various situations; some examples:

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