Mirror configurations

Fig. 6.17 Two-mirror configuration that acts as a 2-block delay to an incoming ball ball s motion follows sequence of arrows.

Fig. 5.7. A filter and mirror configuration for making five photodetectors specific for registering forward scatter, side scatter, green, orange, and far-red signals.

Then, for a second mirror configuration, and hence a periodic solution, it is sufficient that... 

Source Station Magnet Xc or Ec Station or mono horizontal acceptance (mrad) Mirror configuration Mono configuration... 

The basic design of the Ar/JCr ion laser is conceptually similar to that of the HeNe (or other gas) lasers, i.e. a plasma discharge tube contains the active medium with Brewster windows and the resonator constitutes a typical two-mirror configuration. However, unlike HeNe lasers, the energy level transitions that contribute to laser action come from ions of argon or krypton, rather than neutral atoms. The argon or krypton gas is held at a pressure of 1.5 mbar. 

It can be shown [5.1,5.24] that in nonfocal resonators with large Fresnel numbers N the field distribution of the fundamental mode can also be described by the Gaussian profile (5.32). The confocal resonator with d = R can be replaced by other mirror configurations without changing the field configurations if the radius Rf of each mirror at the position zo equals the radius R of the wavefront in (5.37) at this position. This means that any two surfaces of constant phase can be replaced by reflectors, which have the same radius of curvature as the wave front - in the approximation outlined above. 

The beginning of the density revolution occurred when designers began implementing double-sided technologies to allow for the placement of surface-mount components on both sides of a PWB. The continued push toward device density has resulted in placement of BGA components in mirror and quasi-mirror configurations, shown in Figs. 58.7 and 58.8. 

FIGURE 58.7 Double-sided BGA in mirror configuration. Note that the PCA is an exact mirror about the center line of the PWB. In some instances the top- and bottom-side packages share common vias. 

FIGURE 58.8 Double-sided BGA in quasi-mirror configuration. Note that although the packages are not right over each other, there is some overlap when looking from the top down or from the bottom up. 

In the test shown, a mirror configuration is used to produee three simultaneous views of the test sample, with each view covering 1/3 of the periphery. A surface ehafe ean be seen at the left end, and cracks can be seen at the left and center. 

The confocal resonator can be replaced by other mirror configurations without changing the field configurations if the radius b of each mirror... 

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