Investigation of thermal stability of holographic plate/Hologramos terminio stabilumo tyrimas.
by：Taian Lamination Film2020-10-08
1. Introduction holographic photography is a unique way to record and reconstruct all amplitude and phase information contained in the light scattered from the illuminated object [s]1-4]. This method is based on diffraction and interference of coherent light. Holographic images contain all information about the deformation of the surface of the object [5-7]. Holographic photography records the interaction of two beams of coherent light in the form of microscopic patterns of interference stripes. It is registered by photography of interference patterns formed by two laser beams of coherent light. A beam of light travels straight from the light source and another scatter from the object. The holographic film or plate is exposed by two beams of laser and treated in a way that properly illuminates three beams of laser Size drawing production 【8-11]. Holographic photography was invented by Hungarian physicist dennisgambo in 1947. In Our Time, holographic is used for data storage  As a holographic memory, protect the file  And art, holographic interference [14-18] Interference microscope  Electronic holographic, sound holographic, etc. [20-23]. Not related to the field of application, it is very important to ensure the stability of the holographic system during the recording process [24-25]. The interference image must be stable. e. Interference line must be less than 1- A tenth of the interference line. This means a very narrow tolerance range. At exposure, thermal conditions affect the length of the optical way of the object and the reference beam, thus affecting the difference. Since thermal deformation will affect the quality of holographic images, it is important to test the Thermal Deformation of holographic plates. [ Figure 1 slightly] The purpose of this paper is to determine the level of sensitivity of the system to thermal conditions and to analyze how the fixed types of holographic plates reduce thermal deformation. 2. The experimental device for recording the main holographic rainbow holographic production can be divided into two processes: the production of the main holographic and the production of the rainbow holographic [26-28]. Figure 1 shows the scheme of the main Holographic recording. 1. He-Nelaser ([lambda]= 632. 8 nm) Used to record the main hologram. The laser is divided into two beams with a beam splitter: an object and a reference object. The object beam passes through an expanded lens to illuminate the object under investigation, and the light reflected by the object finally illuminates the holographic plate. The reflection of the split Mirror reference beam passes through the expansion lens, and the mirror reflection illuminates the same light plate as the object beam. The interference pattern of the two beams is recorded. The recording process of the main holographic and rainbow holographic is very sensitive to external factors: temperature change, vibration, chemical developers and others . Micro- Or nanoparticles are produced during the rainbow holographic recording process, so it is important to evaluate factors that may affect the stability of the holographic system. If the holographic recording scheme is fixed and there is no change before the experiment, then the stress, deformation and vibration of the optical elements and systems are well established without affecting the quality of the holographic. Then the stability of the holographic plate has the greatest impact on the quality of the holographic. The holographic board is often stored in cold places to increase its durability. Before the holographic recording process, the holographic platform must be placed at ambient temperature. It expands when the holographic plate is opened. If this happens during exposure, the holographic image may lose some information. Therefore, it is important to determine the possible changes in the temperature and deformation of the holographic plate. 3. Calculating the thermal deformation of the holographic plate during expansion during exposure will affect the length of the optical path. This may affect the quality of holographic images. The movement of holographic plates in the range of more than 10% wavelength (He-Ne laser, [lambda]= 632. 8 nm) Will reduce the quality of holographic images. This means that the holographic plate moves more than 63. 28 [10. sup. -9] I want to disturb the hologram. [ Figure 2: The main deformation types of holographic plates are shown in the figure. 2. The temperature change of the holographic plate changes the length L, width W, or thickness d of the plate. The thermal expansion of the plate is marked [DELTA]L, [DELTA]W and [DELTA] Change according to temperature [DELTA] T, when the thermal expansion coefficient of the holographic plate is [alpha] And laser wavelength--[lambda] So, you can write the thermal expansion of the board [30,31][DELTA]L = [alpha][L. sub. 0][DELTA]T (1)[DELTA]W = [alpha][W. sub. 0][DELTA]T (2)[DELTA]d = [alpha][d. sub. 0][DELTA]T (3) The maximum temperature change during the exposure of the holographic plate can be calculated according to the formula (1)-(3) Holographic plate movement ([DELTA]L, [DELTA]W and [DELTA]d) Can not exceed 10%63. 28 * [10. sup. -9]m) The wavelength. [ Mathematical expressions cannot be reported in ASCII. ](4)[DELTA]T = [DELTA]d/[alpha][d. sub. 0]= 63. 28 * [10. sup. -9]/7 *[10. sup. -6]/0. 002 = 4. 52[degrees]C (5) L = holographic plate 10 cm long, W = 10 cm wide, d = 0. Month cmthickness ,[alpha]= 7 * [10. sup. -6] The thermal expansion coefficient is used in the main Holographic recording. Because in our example, the length and width are the same 0. 1 m. And then Max [DELTA] The temperature change cannot exceed 0. 09[degrees]C(Eq. 4). The thickness of the holographic plate is 50 times smaller (d = 0. 002m) This means that the change in temperature may be much higher than its length or width. 52[degrees]C (Eq. 5). From the calculation, we can see that the holographic system is very sensitive to thermal conditions, so it is important to establish a stable system for the maximum brightness of the holographic. 4. The numerical simulation of Thermal Deformation holographic plates is very sensitive to thermal conditions, so the numerical analysis of three fixed types of plates is carried out using the finite element method (FEM) Through software Ansys. Thermal Deformation of the holographic plate fixed on one side using a universal support (Fig. 3) As shown in the figure. 4. In this case, the thermal variation of the length is the largest (Fig. 5) However, this method of fixing can reduce the thermal deformation by 12 times. This means that the temperature change cannot exceed 1. 1[degrees]C. [ Figure 3 slightly][ Figure 4 slightly][ Figure 5 Slightly] Thermal Deformation of holographic plates fixed on two adjacent sides using multiple brackets (Fig. 6) As shown in the figure. 7. In this case, the thermal variation of length and width is the largest, they are shown by curve 1 in figure 18. Because the holographic plate and the fixation are symmetrical, the change in length and width is the same. This fixing method reduces thermal deformation. 5 times. This means that the temperature change cannot exceed 1. 3[degrees]C. [ Figure 6 slightly][ Figure 7 Slightly][ Figure 8: Thermal Deformation of holographic plates fixed on two opposite sides using angle fine tuning installation (Fig. 9) As shown in the figure. 10. In this case, the thermal variation of the width is the largest (Fig. 11) But this method of fixing can reduce the thermal deformation by 23 times. Temperature change cannot exceed 2 [degrees]C. [ Figure 9 omitted[ Figure 10 slightly][ Figure 11 omitted][ Figure 12:[ Figure 13:[ Figure 14 omitted] If we compare these three fixed methods of holographic plates, we get the least change in length (Fig. 12) When installing a fixed plate using angle fine tuning (Fig. 9). We get the smallest change in width (Fig. 13) When using the universal bracket fixing plate (Fig. 3) , And the minimum change in thickness (Fig. 14) It also appears when using the universal bracket fixing plate. Different supports can reduce different deformation. It is clear from calculation and modeling that length and width are most sensitive to temperature changes. Therefore, for the fixing of the holographic plate, it is recommended to use the angle fine-tuning installation to fix the plate on two opposite sides. 5. Experimental study of thermal deformation holographic platform in order to ensure the high stability of the optical system for rainbow holographic recording, a large number of experimental studies are required. In most cases, the vibration or deformation in the optical scheme is measured in microns. The holographic method is therefore used to analyze the stability of the optical scheme and to model and visually compare the experimental results. Prism system is used for testing (Fig. 15). The Prism system is a two-beam blob interferometer. The laser beam from the irradiation head 3 to the object 4 is the object beam. Camera 1 collects the scattered laser on the object. The reference beam usually reaches the camera directly in the fiber. A shape change that occurs between the reference and the force state of the object produces a stripe at the top of the image of the object, which is displayed on the monitor. [ Figure 15 omitted]Fig. 16 shows the pattern of holographic interference stripes on the hot surface (T + 2[degrees]C) General use (Fig. 3), multiple (Fig. 6) Fine tuning of angle (Fig. 9)holders. The white area in the holographic image and a small amount of interference lines correspond to a very small deformation field of the holographic plate. This means that a slight thermal deformation occurs when the plate is fixed in two opposite positions (Fig. 16, c). [ Figure 16 omitted]6. Conclusion in the wavelength range of more than 10%, the thermal deformation of the holographic plate will reduce the quality of the holographic image. 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