Fine grain Blue- and Green- sensitive photofilm
Designed for holograms recording with pulsed and CW lasers
Guaranteed lifetime for film rolls : 18 months
Guaranteed lifetime for cut sheets of film : 10 months
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This Silver Halide photomaterial is used in art holography (one or two steps holograms recording). Resolution: more than 3000 lines/millimeter.
The largest standard film width is 35 centimeters. Custom film substrates sizes are available for the coating on request. Guaranteed material lifetime – 10-18 months.
White-light holograms made on VRP-M have a natural green reconstruction colour that can be easily changed by the technique of colour -shifting using D-Sorbitol (described below).
Characteristic curve of green sensitive VRP-M emulsions, showing spectral sensitivity versus wavelength, is shown in Fig.1. As it is seen from the curve – VRP-M works well in the green and in deep blue regions of spectrum, showing the peak at approximately 75 microJoule/cm2 (~530 nm).
Fig.2 shows the optical density after VRP-M exposure by CW radiation and after development versus energy. Grain size is shown in Fig.3. The diffraction efficiency versus exposure for reflection holograms recorded on VRP-M (using a pulsed laser) is presented in Fig.4. The maximum diffraction efficiency is seen to be >45%. Material lifetime is more than two year.
Processing and handling recommendations
- Unseal and process in indirect non-actinic light with use of a dark-red light filter (transmission zone 600 nm and more).
- Temperature of processing solutions – 20°C.
- Storage condition: Humidity 65% and 12-15deg. Celsius.
Recommended Chemical set of SM-6 developer and PBU-Amidol bleach can be obtained from our web shop.
|Recommended VRP-M processing|
|Exposure:||~70 – 100 microJ/cm2|
|Development||SM-6 , 2min (or till density 1.5-2)|
|Bleach||PBU-Amidol until clear (~2-3 min) plus 2 minutes|
|Wash||Water 5 min.|
|Final Wash||Water with wetting agent (Agepon) 1min|
All material performances given above are guaranteed only for the use with the recommended chemistry.
For the conventional CW holography one, on own risk, may also use the standard Kodak D-19 developer (3 min.) and Sulfuric- Potassium dichromate bleach (2-3min. : 30ml sulfuric acid + 5gm potassium dichromate + 1 liter of water).
Adjustable colour shifting is accomplished by soaking the hologram for 1 minute in an aqueous solution of D-Sorbitol (sugar substitute – C6H14O6) or usual Sugar powder, with added wetting agent. The colour of the final hologram depends on the solution concentration (Fig.5).
After soaking, the film must be taken out and put onto a flat surface. Water drops must be removed using a rubber wiper such as a windscreen wiper. Here one must be delicate – if too much force is employed you may obtain a somewhat different colour than that predicted by Fig. 5. If, after drying of the hologram, the replay colour achieved is not satisfactory, the film or plate may be washed in warm water and then soaked anew in another D-Sorbitol solution of different concentration.
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