Phase Holograms in Dichromated Gelatin

Abstract

The gelatin-dichromate photosensitive system has been shown to be very efficient as a recording medium for both two- and three-dimensional holographic gratings. Upon development, as much as 33% of incident reading light is diffracted into the first order for the unmodulated thin phase gratings and 95% for the thick holograms. The material can record a grating spacing at least as small as 2600 A, and gives reconstructions comparable with those obtained in 649F film. The air-gelatin index differential of 0.54 is considered responsible for the high diffracted powers found. Exposures vary from 3 mJ to 150 mJ at 4880 A. Certain films have speeds within two orders of magnitude of 649F holographic film.

Performances of volume phase holographic grating for space applications: study of the radiation effect

“…Different materials are used to realize VPH gratings [12]; for example, silver halides [13], DCG [4,14,15], photopolymers [16][17][18], and photochromic materials [19,20]. VPH gratings made on DCG are commonly used in ground-based astronomy applications.…”

Photosensitive Guest-Host Polymer for Optical Data Storage

“…It is evident that in the MBPMMA samples one deals with a photobleaching process. Light induced reaction transforms the MB molecule into its leuco form (leuco-MB) which does not absorb the light at the excitation wavelength (632.8 nm) [2,5]. The photobleaching rate is strongly dependent on light intensity with tendency of saturation for longer exposure times.…”

“…Methylene blue (hereafter abbreviated as MB), an organic dye has found application in conventional and polarising holography [2]. The principal mechanism of optical recording is photobleaching of MB.…”

“…The principal mechanism of optical recording is photobleaching of MB. Methylene blue sensitized gelatins (MBDCG) [2][3][4][5][6][7][8][9][10] in which the high diffraction efficiencies of about 80% were measured are well recognised [6]. The most noticeable drawback is that the formation of these holograms is complex and time consuming procedure including: fabrication of the MBDCG plates, exposure and development [11,12].…”

<title>Silver-Halide Gelatin Holograms</title>

“…MajorLIN advatage ofM sive-ald gelatin hoo2.s r wid spectral resons an6oe8epsr0eqieet The dichromated gelatin process can produce nearly ideal holograms which have high diffraction efficiency and little scattering and absorption [1][2][3]. However, dichromated gelatin has two basic drawbacks.…”