Dispersion optic axes

D. Overall construction principle. Once the requirements of cell area (ab) to be viewed, the spectral resolution AX and the dispersion on the detector channels are established and the general principles on the choice of optical elements are defined, it is possible to implement the overall construction design (Fig. 1). 

For simplicity we treat the microcavity with an optically active material as a slab of width Lc bounded by two perfect mirrors. Let the 2-ax is be directed normal to the cavity plane, with z = 0 corresponding to the middle of the microcavity. The eigenmodes of the empty microcavity are characterized by a two-dimensional (in-plane) wavevector q, and the values of the wavevector in the -direction are quantized, with kz = tt/Lc for the lowest energy eigenmode. The mode which we will consider is polarized in the xy plane, and is normal to the photon wavevector q. Its dispersion is given by ... 

There are other factors that limit the freedom of selection of optical elements. Figure 3 is a schematic diagram for the dispersing element in Fig. 2 based on a diffraction grating. The diameter D2 is determined by the minimum resolvable frequency difference for the grating, Ax)o, where the frequency of the light v = 1/A and Avg are expressed in cm For a circular beam of diameter D2,... 

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