48
1 Resonance Methods for Increasing Sensitivity of Interferometry …
where I
(C)
(0) is the intensity of a weak beam at the output; I
(M) is the intensity
of a strong beam; tgϕ =
E
(M)
y
E
(M)
x
; ε
0 is the dielectric medium permeability under the
absence of powerful beam; A is the constant of nonlinearity; L is the cell length.
5
As it is seen from (1.43), light intensity at the output is connected with the intensity
of a weak beam by linear law, by the square of the intensity of powerful beam and
square of cell length and strongly depends on powerful beam polarization. When
deducing this formula, we neglected the effect of proper rotation, i.e., the change of
polarization of powerful beam at the length of the cell.
But this effect does not make fundamental changes to the results but complicate calculations and the final answer. Moreover, it should be noted that polarization automatic changes do not appear in the case of only circular or plane
polarization [97].
The conducted studies allow concluding that mismatching of polarization planes
of initial interfering beams, which participate in the recording of volume dynamic
gratings in the medium with resonance absorption leads to the effect of rotation of
the plane of polarization of a weak wave in the field of a strong wave of the same
frequency provided by birefringence, displaying of which does not allow detecting
the diffraction contribution.
1.7 Results and Conclusions
The majority of the results of the studies presented in the first chapter were made by
the author during his postgraduate study and during his work in Leningrad Physics
and Technology Institute AS USSR named after A. F. Ioffe of the Academy of
Sciences of the USSR (1971–1975).
Dye laser “Raduga-3M” with laser pumping for the first time was mounted by
Tanin L. V. from the separately developed drawings in the Institute of Physics of
the Academy of Sciences of the BSSR into the instrument version and was made in
the optical mechanics departments of Leningrad Physics and Technology Institute
named after A. E. Ioffe of the Academy of Sciences of the USSR (1971). During its
mounting, some changes were made, in particular, the resonator length was increased
and the Fabry–Perot interferometer with the basis of 100 μm was included. Due to
this, it became possible to narrow the generation spectrum width to 0.01–0.03 nm
with pulse energy of 10
−3 J and power of about 0.1 mWt. These changes made it
suitable for the purposes of holography and resonance interferometry [12, 36, 39].
5 In the case of strong effects or very large length of a cell, the dependence is more complicated:
I (C) L ∼ sin 2 A|E|
2 L/2
√
ε.
1 Resonance Methods for Increasing Sensitivity of Interferometry …
where I
(C)
(0) is the intensity of a weak beam at the output; I
(M) is the intensity
of a strong beam; tgϕ =
E
(M)
y
E
(M)
x
; ε
0 is the dielectric medium permeability under the
absence of powerful beam; A is the constant of nonlinearity; L is the cell length.
5
As it is seen from (1.43), light intensity at the output is connected with the intensity
of a weak beam by linear law, by the square of the intensity of powerful beam and
square of cell length and strongly depends on powerful beam polarization. When
deducing this formula, we neglected the effect of proper rotation, i.e., the change of
polarization of powerful beam at the length of the cell.
But this effect does not make fundamental changes to the results but complicate calculations and the final answer. Moreover, it should be noted that polarization automatic changes do not appear in the case of only circular or plane
polarization [97].
The conducted studies allow concluding that mismatching of polarization planes
of initial interfering beams, which participate in the recording of volume dynamic
gratings in the medium with resonance absorption leads to the effect of rotation of
the plane of polarization of a weak wave in the field of a strong wave of the same
frequency provided by birefringence, displaying of which does not allow detecting
the diffraction contribution.
1.7 Results and Conclusions
The majority of the results of the studies presented in the first chapter were made by
the author during his postgraduate study and during his work in Leningrad Physics
and Technology Institute AS USSR named after A. F. Ioffe of the Academy of
Sciences of the USSR (1971–1975).
Dye laser “Raduga-3M” with laser pumping for the first time was mounted by
Tanin L. V. from the separately developed drawings in the Institute of Physics of
the Academy of Sciences of the BSSR into the instrument version and was made in
the optical mechanics departments of Leningrad Physics and Technology Institute
named after A. E. Ioffe of the Academy of Sciences of the USSR (1971). During its
mounting, some changes were made, in particular, the resonator length was increased
and the Fabry–Perot interferometer with the basis of 100 μm was included. Due to
this, it became possible to narrow the generation spectrum width to 0.01–0.03 nm
with pulse energy of 10
−3 J and power of about 0.1 mWt. These changes made it
suitable for the purposes of holography and resonance interferometry [12, 36, 39].
5 In the case of strong effects or very large length of a cell, the dependence is more complicated:
I (C) L ∼ sin 2 A|E|
2 L/2
√
ε.