1.5 New Class of Detecting Media for Holography—Gaseous Media …
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Fig. 1.29 Spectral intensity path in the first diffraction order: a when adjusting the laser radiation
spectrum to the short-wave component of the resonant sodium doublet; b when adjusting the laser
radiation spectrum to the long-wave component of the same doublet. Reprinted from [54] with
permission
Fig. 1.30 Intensity distribution on the spectrum height of initial and additional beams for the
wavelength of 588.6 nm. Reprinted from [54] with permission
Figure 1.31 shows a diffraction image, which corresponds to the intensity relation
of 1:30. Under the given convergence angle of 4 × 10
−3 rad. with the increase of the
concentration from 10
14 to 10
16 cm
−3 , the intensity of the additional beam could be
observed (see Fig. 1.32).
In the studied interval of sodium vapors concentration, the additional beams intensity dramatically decreases under convergence angles more than 5 × 10
−3 rad, which
corresponds to the transition from plane to volume dynamic grating (see Fig. 1.27d).