It should be noted that, in the optical region of the spectrum, the separation of monochromatic radiation can also be carried out using a mirror. Requirements for the angular size of the mirror are specified by the same conditions (4). Hence it follows that in a number of experiments that do not require a very high monochromatization of the radiation beam, undulator radiation can be used without a monochromator.
To generate the induced radiation, the mirrors of the optical cavity are placed on the undulator axis. The accumulation and amplification of spontaneous undulator radiation occurs in the cavity. Its high directivity makes it possible, with relatively small dimensions of the resonator mirrors, to confine the main part of the spontaneous emission energy of a given wavelength. When choosing the geometry of the optical resonator, the diffraction size of the emitter in the undulator is taken into account . Obviously, in this case, in contrast to free space, a discrete set of electromagnetic waves (modes) will be excited. The distance between the mirrors is chosen so as to synchronize electron bunches with optical radiation pulses from neighboring bunches of the beam. Monochromaticity of radiation is determined by the length of the electron bunches.
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