42
1 Resonance Methods for Increasing Sensitivity of Interferometry …
Fig. 1.31 Diffraction image on the dynamic phase grating under frequency tuning of the dye laser
near sodium absorption lines (under intensities relation recording dynamic phase grating of 1:30).
Reprinted from [54] with permission
Fig. 1.32 Diffraction image on the dynamic phase grating under sodium atoms concentration
changing. Reprinted from [54] with permission
In conditions providing the formation in sodium vapors of volumetric dynamic holograms, there was carried out experimental study of the energy redistribution effect
between interfering beams under different relation of their intensity.
The change of the intensity relation of interfering beams to the value of 1:30
was achieved when filters of different optical density were included in one of the
Mach–Zehnder interferometer arms, and glass plates, which compensate optical path
difference—in the other one. The spectrograms obtained were processed by the
method of photographic photometry.
Under the intensity values of initial beams, which considerably differ from each
other, we detected essential (up to 4 times) increase of the relation of spectral intensities of weak and strong beams at the output of the cell with sodium vapors. Redistribution of energy between the beams was observed only for wavelengths lying
in the range of contours of sodium vapors absorption line. A control measurement
was carried out to estimate measurement errors, which connected with microphotometry spectrogram. These spectrograms were produced in similar conditions with
homogeneous heat source. Figure 1.33 shows one of such spectrograms, which was
photographed with the help of the spectrograph DFS-8, in front of the slit of which
step attenuator was placed. The presence of step attenuator made it possible to
1 Resonance Methods for Increasing Sensitivity of Interferometry …
Fig. 1.31 Diffraction image on the dynamic phase grating under frequency tuning of the dye laser
near sodium absorption lines (under intensities relation recording dynamic phase grating of 1:30).
Reprinted from [54] with permission
Fig. 1.32 Diffraction image on the dynamic phase grating under sodium atoms concentration
changing. Reprinted from [54] with permission
In conditions providing the formation in sodium vapors of volumetric dynamic holograms, there was carried out experimental study of the energy redistribution effect
between interfering beams under different relation of their intensity.
The change of the intensity relation of interfering beams to the value of 1:30
was achieved when filters of different optical density were included in one of the
Mach–Zehnder interferometer arms, and glass plates, which compensate optical path
difference—in the other one. The spectrograms obtained were processed by the
method of photographic photometry.
Under the intensity values of initial beams, which considerably differ from each
other, we detected essential (up to 4 times) increase of the relation of spectral intensities of weak and strong beams at the output of the cell with sodium vapors. Redistribution of energy between the beams was observed only for wavelengths lying
in the range of contours of sodium vapors absorption line. A control measurement
was carried out to estimate measurement errors, which connected with microphotometry spectrogram. These spectrograms were produced in similar conditions with
homogeneous heat source. Figure 1.33 shows one of such spectrograms, which was
photographed with the help of the spectrograph DFS-8, in front of the slit of which
step attenuator was placed. The presence of step attenuator made it possible to