Preparation of Dichromated Gelatin Films for Holography

Francois, E.E.; Shankoff, T. A.

doi:10.1364/ao.8.002346

Cited by 29 publications

(5 citation statements)

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“…It is known that DCG is more sensitive to long-UV light than to visible light [ 2 , 3 ] therefore, a UV mercury metal-halide pressure lamp was used in the recording. In the following set of experiments, the light source was an extended one, as shown in Figure 2 b.…”

Section: Methodsmentioning

confidence: 99%

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Surface Profile Studies of Photoinduced Gratings Made with DCG Films with Optional Papain Development

Calixto

Piazza

Garnica

2022

Gels

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The use of surface relief structures is increasing in the field of optics. A study of photoinduced relief using dichromated gelatin films with different thickness is described in this paper. Two light sources were used: a laser (λ = 468 nm) and an ultraviolet mercury-metal halide lamp. Gratings with low spatial frequencies were contact-copied on the DCG (dichromated gelatin) films. Two development processes were used, one included washing the plates with just water and the other with a mixture of water and papain. This enzyme is used to improve the gratings’ relief which was studied with a profilometer. For the development process with just water, it was found that when gratings were recorded using visible or UV light, the height profile inversely correlated to spatial frequencies. For short exposure times, the reliefs showed a sinusoidal profile. When visible light was used, the DCG areas where the Ronchi grating had transparent slits showed a flat relief and the areas where the Ronchi grating had opaque slits showed a round peak, with the peak being taller than the flat surface. In contrast, when UV light was used, the flat surfaces were taller than the peaks. The relief height increased up to seven times when papain was used.

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Section: Methodsmentioning

confidence: 99%

“…In 1968, Shankoff [ 2 , 3 ] proposed the use of dichromated gelatin plates (DCG plates) as the material to record holograms. He found diffraction efficiencies of 33% for thin phase gratings and 95% for thick holograms.…”

Section: Introductionmentioning

confidence: 99%

Surface Profile Studies of Photoinduced Gratings Made with DCG Films with Optional Papain Development

Calixto

Piazza

Garnica

2022

Gels

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“…Gravity settling method was adopted for casting the films [4]. The films were casted on dirt-free and perfectly clean microscopic glass slides of dimension 75mm X 25mm X 1.35mm.…”

Section: Experimental Set Upmentioning

confidence: 99%

Shelf Life and Storage Life Studies of Blue Sensitive Photopolymer for Holographic Applications

Sreebha¹,

Rajesh²,

Katha³

et al. 2011

AIP Conference Proceedings

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“…Dichromated gelatin forms thick-phase holograms which transmit effectively all the incident light but whose fringes spatially vary the phase of the transmitted wavefront. Brandes et al (1969) have described the formation and development of dichromated gelatin films and they suggest that the combination of water and isopropanol used on gelatin hardened with ammonium dichromate results in the best photographic speeds with the highest signal to noise ratios, which may, in fact, be up to five times greater than 649F emulsion.…”

Section: Holographic Recording Mediamentioning

confidence: 99%

Vibration analysis by holography

Fryer¹

1970

Rep. Prog. Phys.

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Contents 1. Introduction . 2. Holography in general . 2.1. Theory , 2.2. General holographic techniques . 2.3. Holographic recording media . 2.4. Techniques for maximum light utilization 3.1. Theory , 3.2. The basic stroboscopic method and its uses . 3.3. Live and frozen fringe techniques. 3.4. Strobing techniques . 3.5. Advantages of the stroboscopic method 3.6. Disadvantages of the stroboscopic method 4.1. Theory .4.2. Advantages and disadvantages of the time-averaged method 4.3. Modifications . 4.4. An application of time-averaged holography. 5 . Alterations in sensitivity, and related methods . 5.1. Methods for increasing sensitivity . 5.2. Methods for reducing sensitivity . 5.3. Related methods of vibration analysis . 5.4. Conclusion..

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Preparation of Dichromated Gelatin Films for Holography

Cited by 29 publications

References 1 publication

Surface Profile Studies of Photoinduced Gratings Made with DCG Films with Optional Papain Development

Surface Profile Studies of Photoinduced Gratings Made with DCG Films with Optional Papain Development

Shelf Life and Storage Life Studies of Blue Sensitive Photopolymer for Holographic Applications

Vibration analysis by holography

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