Recording and reproducing method for hologram

[Detailed Description of the Invention]

[eye following] - Outline - Field of the Invention - PRIOR ART - The means and operation for solving the problem and problem which an invention tends to solve - EXAMPLE - EFFECT OF THE INVENTION [Outline important point] Recording and reproducing systems of the hologram which attained advanced Yield difference amendment in hologram record and a regeneration method in case the reproduction wavelength of a hologram differs from a creation wavelength when the time of creation and reproduction irradiated with a recording medium via a deviation element. [Industrial Application] The present invention relates to hologram record and a regeneration method, and relates to the hologram record and the regeneration method in the case of using the light wave from which a wavelength differs especially at the time of record and reproduction. [Description of the Prior Art] Although a hologram makes it interfere that are the same wavelengths as the time of reproduction, and there are a wave face and a reference wave to usually reproduce and is created, Since a recording medium does not have sufficient sensitivity if a hologram is created using the semiconductor laser of the same long wavelength when using long wavelength lights, such as a semiconductor laser, at the time of reproduction, the efficiency for previous mails in the same wavelength as the time of reproduction is given, and creation of a good hologram cannot be performed. Therefore, when it would come, unlike the time of reproduction, the recording medium was creating the hologram with the light of the wavelength with sufficient sensitivity. Drawing 4 (a) showing the conventional hologram preparation method in Drawing 4 (b) is shown in Drawing 5 at the time of each and reproduction -- as the hologram preparation method in the case of allotting a laser light source (wavelength lambdal) to the position of point P1 of distance f1 of a hologram, and imaging a hologram image in the position of point P2 of distance "2 from a hologram -- each -- another example is shown. In one method (as shown in 81 figure, it irradiated with the recording medium from the point P3 side using the light of wavelength lambda 2 which has sufficient sensitivity for hologram creation by having made into the creation light wave point Pz and two coherent spherical waves which make P4 an emitting point, and was creating hologram 1.) In another method (as shown in b1 figure, it irradiated with the recording medium from point P and the side by having made into the creation light wave two coherent spherical waves which similarly make point ps and p an emitting point on wavelength lambda 2, and was creating hologram 1.), [Problem(s) to be Solved by the Invention] If laser diode 2 of wavelength lambda 1 is allotted to the position of point P1 and hologram 1 which was carried out in this way and created is reproduced in it, even if it will change the position of point P:1.P4 or point Ps, and Pi how at the time of creation, As shown in Drawing 5 at the time of reproduction, the Yield difference arose in the position of point P2, and it was not able to obtain a desired reproduction hologram light wave. The present invention is made in view of a fault of the above-mentioned conventional technology. The objects are desired condensing and offer of hologram record and a regeneration method with which a hologram which has a deviation function is obtained, without producing a Yield difference, when reproducing a hologram using light of a different wavelength from the time of creation. [Means for Solving the Problem] In order to achieve this object, in the present invention, it irradiates with a recording medium by two creation light waves at the time of hologram creation, and records an interference-fringes pattern on the recording medium, In hologram record and a regeneration method which irradiates with the above-mentioned interference-fringes pattern by a reproduction light wave from which the above-mentioned creation light wave and a wavelength differ at the time of hologram reproduction, and obtains a reproduction hologram light wave, At least one creation light wave irradiates with a recording medium via a deviation element, and a reproduction light wave irradiates with an interference-fringes pattern via a deviation element. [For Work ] Corresponding to a wavelength of reproduction conditions (a wavelength of a reproduction light wave, a light source position, a focal length, etc.), and a creation light wave, a position of deviation elements (a glass board, a prism, etc.) and shape are selected, and a recording medium is irradiated with a creation light wave and a reproduction light wave via this deviation element. [Example] The hologram preparation method concerning the present invention is shown in Drawing 1. 0 point QI which shows the example of a hologram preparation method in case Drawing 1 allots a laser light source (wavelength lambda 1) to the position of point P1 of distance f1 from a hologram at the time of reproduction as shown in Drawing 2, and it images a hologram image in the position of point P, of distance f2 from a hologram. Irradiate with a recording medium the coherent spherical wave light of wavelength lambda 2 (<lambda1) which converges on Q respectively via optical deviation element (all [ in this example ] prism) 3.4, both lights are made to interfere on a recording medium, an interference-fringes pattern is recorded, and hologram 1 is created. In reproducing this hologram 1, as shown in Drawing 2, laser diode 2 (wavelength lambda) is allotted to position P of distance r, from hologram 1, and it irradiates with hologram 1 via optical deviation element (this example thick glass board of thickness d) 5. The reproduction hologram light wave which converges on point P by this is obtained. Thus, at the time of creation, when the time of reproduction irradiates with a hologram recording medium via a deviation element, amendment of the Yield difference by the difference in the wavelength at the time of creation and reproduction is performed at both times of creation and reproduction, and advanced Yield difference amendment is attained. According to creation conditions and reproduction conditions, it can ask for the shape of a deviation element, a position, etc. by calculation. - As an example f= 29 mm fz-4IQ++n lambda = 787 nm Apex angle theta 1 of deviation element (prism) 3*4 in lambda= =488nm, theta 2, ascending vertical angle phi! Calculation results, such as 11. and Q, are shown in Drawing 3 at phi 2, peak coordinates A.I. Artificial Intelligence, A2, and condensing point coordinates. By using the illustrated composition, recording a hologram and reproducing, the circle-of-least-confusion diameter of the reproduction outgoing radiation beam (reproduction hologram light wave) could be extracted very small, and advanced Yield difference amendment has been realized. As a deviation element, a spherical lens, cylinder lens, and thick monotonous and other optical members other than a prism and a thick glass board can be used. As for the deviation element at the time of reproduction, it is desirable for one side to consider it as a plane optical element, and to stick and provide in a hologram. Thereby, it can serve as the protective action as seal material of a hologram. [Effect of the Invention] As explained above, in the present invention, at the time of creation of a hologram, the time of reproduction irradiates a hologram recording medium with creation Wave light and reproduction Wave light via an optical deviation element, and it is performing Yield difference amendment. Therefore, it is a basis (a Yield difference is amended highly, it becomes possible to reproduce a hologram efficiently using the light of the long wavelength of a semiconductor laser etc., and the possibility of hologram use increases.) to the difference of the wavelength of creation Wave light and reproduction Wave light.

[Brief Description of the Drawings]

The explanatory view of the hologram preparation method which requires Drawing 1 for the present invention, the explanatory view of the hologram regeneration method which requires Drawing 2 for the present invention, the explanatory view of the example of the hologram record and the regeneration method which requires Drawing 3 for the present invention, the explanatory view of the hologram preparation method of the former [ Drawing / 4 ], and Drawing 5 are explanatory views of the conventional hologram regeneration method. 1 ... hologram, 2 ... laser diode, 3.4.5 ... deviation element. ゝ, hologram preparation method explanatory view 3.4 of the present invention ... Deviation element Drawing 2 of an explanatory view of the hologram regeneration method of the present invention 5 ... Deviation element Jolo Grad [ of the present invention ] - - Drawing 3 of an explanatory view of the example of a creation regeneration method Conventional Drawing 4 of a hologram preparation method explanatory view 1 ... Hologram Conventional Drawing 5 of a hologram regeneration method explanatory view 1 ... Hologram 2 ... Lade diode