A basic study of holographic image reconstruction in colors using blue-violet laser light

On a study of holographic image projection by blue-violet color laser light employed with an improved mist screen

“…The one works for supplying mist, and the other, for exhausting unnecessary mist from the screen. At first, we illuminated the wave onto the hologram plane (DMD panel 4,5 ) formed by the hologram produced by computer. Next, we projected the reflected wave fronts from the DMD panel onto the spatial screen (mist).…”

“…In fact, wavelength of blue-violet color laser light is short and it is the minimum value of visible rays. For this reason, projection process of holographic reconstructed images by blue-violet color laser light seems to have not been discussed without a projection to the diffusion plate screen 4,5 . In this paper, we consider the spatial projecting process adopted mist screen 6 .…”

On an improvement of the stability of a spatial mist screen employed a fan without blades in the display of a projected holographic image

“…Holographic technique for moving pictures [1][2][3][4][5][6][7][8][9][10] with the use of spatial light modulator (SLM) is strongly expected as a basic technical element to develop a 3D-TV in the next generation. On the other hand, since the pitch of the pixel of usual SLM is of the order of several micron, we must apply this as a diffraction grating 2 .…”

“…For this reason, it is not possible to make it satisfy the space-bandwidth product (SBP) condition required for the hologram specified by the order of submicron, and so, the size of the reproduced images and the viewing area should be restricted. In order to solve this problem, holographic projection process with the use of spatial screen [3][4][5][6][7][8] , a process with the aid of multiple mirrors 9 , and the one with HOE 10 etc., have been studied. As preceding ones accompanied with spatial screen, the ones using diffused material such as plasma-formed air 3 and Agarose mixed liquid 4 , and the ones using a mist flow 5,6 , or the scattered material such as a mixed liquid with minute particles 7 or micro-bubble 8 etc., have been reported.…”

“…In order to solve this problem, holographic projection process with the use of spatial screen [3][4][5][6][7][8] , a process with the aid of multiple mirrors 9 , and the one with HOE 10 etc., have been studied. As preceding ones accompanied with spatial screen, the ones using diffused material such as plasma-formed air 3 and Agarose mixed liquid 4 , and the ones using a mist flow 5,6 , or the scattered material such as a mixed liquid with minute particles 7 or micro-bubble 8 etc., have been reported. Especially, as for the process using the mist of flow 5,6 , it is reported that since the spatial screen is constructed only by the mist, it has the advantage such that we can easily adjust the size of the screen, easily extend the size of the projected image and the viewing area, and easily reproduce the images with high brightness and so on.…”