I ran across mention of it in Saxby's latest edition. A search on Kodak's US site turns up no hits (although Russia & UK find the info I've linked above) but I've got a support email off to them asking for more information.
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If someone says it can't be done but they haven't tried it, don't believe them. http://www.dragonseye.com/Holography
Description
When selecting a plate for holographic applications, it is important to match peak sensitivity to the wavelength emission of the laser being used. KODAK Holographic Glass Plates 120CX and 120PX can be used with helium-neon, krypton, and ruby lasers for holograms with microfine grain and low reconstruction noise.
A microfine-grain emulsion
Excellent dimensional stability
High speed-grain ratio
High sensitivity in the 600 to 750 nm region
Low reconstruction noise
High dimensional stability
Applications:
Recommended for conventional side-referenced holography and related techniques involving exposure with helium neon, krypton, and ruby lasers.
3-D holographic displays
Holographic interferometry
Holographic information storage
Spatial filters (Plates)
Holographic microscopy
Recording high density digital data
Emulsion Thickness
Unprocessed
120 Plates
6 micrometre
Most photographic emulsions tend to shrink during processing. This results from the removal of unexposed silver halide grains and from tanning of the gelatin. In addition to a decrease in average emulsion thickness, the emulsion tends to shift toward the center of the plate. Both changes can be especially troublesome in holography.
Stability
The 120 Plate emulsion is stabilized in manufacture in order to reduce shrinkage following processing. The resulting improvement in dimensional stability over unstabilized emulsions is limited largely to the plane of the emulsion, a factor of some importance in such applications as holographic interferometry.
Base Materials
120CX Plate is supplied with antihalation backing.
120PX Plate is supplied without antihalation backing.
Sizes Available
The following are commonly available sizes and catalog numbers. Other sizes may be available upon request. Consult your local supplier of Kodak glass plates.
Darkroom Recommendations
None, total darkness required. While these materials are very slow by conventional photographic standards, it is recommended that they be handled in total darkness.
Storage and Handling
Store unexposed plates at 70°F (21°C) or lower and 40 to 50% RH. Process exposed plates as soon as practical. Store processed glass plates at 63 to 77°F (17 to 25°C) and 30 to 50% RH.
For extended storage, keep unopened packages in a refrigerator at 40 to 50F (5 to 10C). Package should be removed several hours before opening to avoid condensation on the emulsion surface. Freezing is not recommended.
Exposure
The effective speed of the 120 Plate is dependent upon several factors, especially the exposing wavelength and the processing cycle to be employed. Therefore, it is impossible to recommend a single a single exposure that will lead to a optimum compromise between maximizing reconstruction ratio and minimizing noise in the reconstructed image. The spectral sensitivity curves may be used to obtain an estimated exposure level in radiometric units for the wavelength of interest. (If the plate is to be processed conventionally to form an amplitude hologram, a density of 0.8 should be assumed. If the hologram is to be bleached to form a phase hologram, it will generally be safer to assume a required density of 2.0.) Exposure levels determined in this manner should be used as the midpoint in an exposure series in order to determine the optimum exposure experimentally.
Like most micro-fine-grain materials, these products exhibit significant latent image fading during the first few hours following exposure, resulting in a loss in effective speed. Because of this, the elapsed time between exposure and processing should be held to the minimum that can be maintained for all exposures in a test series and in the operational exposures to follow. A plate that has been exposed optimally for processing a half hour later will be grossly underexposed if processing is deferred until the following day.
Image Structure
120 Plate uses extremely fine grains of silver halide. Granularity values based on classical methods for measuring rms granularity are not a reliable indicator of holographic system performance.
Similarly, resolving power values determined by conventional means do not provide a reliable indicator of holographic resolving power.
Processing
Careful attention to uniform processing techniques and conditions is strongly recommended. While exposure conditions can be varied to achieve good holographic performance over a relatively broad range of development, it is generally advantageous to standardize processing conditions in order to minimize the effects of processing variability. Uniform agitation during development, in both manner and amount, is especially important.
Develop at 68°F (20°C) with continuous agitation using KODAK Developer D-19 for 5 to 10 minutes.
Development for 10 minutes yields higher speed with a moderate increase in noise upon reconstruction than development for 5 minutes.
Rinse at 65 to 70°F (18 to 21°C) agitation:
KODAK Indicator Stop Bath
30 seconds
or running water
30 seconds
Fix at 65 to 70°F (18 to 21°C) with frequent agitation:
KODAK ULTRALINE Fixer
KODAK PROFESSIONAL Rapid Fixer
5 minutes
Wash at 65 to 70°F (18 to 21°C) with moderate agitation for 15 minutes.
To conserve water and reduce washing time, use KODAK Hypo Clearing Agent after fixing. First, remove excess hypo by rinsing the film or plate in water at 65 to 70°F (18 to 21°C) for 10 seconds. Then bathe in Hypo Clearing Agent solution for 15 seconds with moderate agitation. Follow this with a 30 second wash at 65 to 70°F (18 to 21°C). Allow at least one change of fresh running water during this time.
Note: For highest quality holograms, keep the temperatures of all processing solutions, including the wash water, the same. In this way, image movement due to random shifts in the emulsion layer—as the gelatin alternately swells and shrinks during processing—will be minimized.
Dry in a dust-free place.
To minimize drying marks, treat plates or film in diluted KODAK PHOTO-FLO Solution after washing, or by wiping the surfaces carefully with a damp KODAK Photo Chamois or a soft viscous sponge. The use of PHOTO-FLO Solution will also aid in drying plate and film surfaces uniformly. For best results, dry plates and films slowly at room temperature.
Special Processing Notes
Do NOT use KODAK HRP Developer. This developer is specifically NOT recommended for use with 120CX and 120PX Plates.
This emulsion exhibits a pale green residual dye stain. The dye can be reduced significantly by using a 75-percent methanol-water solution for 3 minutes followed by the final wash. (See "Dye Removal from Holographic Film," Coblitz and Carney, Applied Optics, 13 No. 9, September 1974, p. 1994.)
The KODAK Reversal Bleach Process for generating phase holograms (described in KODAK Publication No. 230) was optimized for use with 649-F Plates (discontinued). Experience indicates this process is not applicable to this emulsion without modification.
The following textbook is recommended as a reference for holographic processing and bleaches:
Silver-Halide Recording Materials for Holography and Their Processing, 2nd edition
Author: Hans Bjelkhagen
Springer series in optical sciences, V. 66
Springer Verlag, 1003, ISBN 0-387-56576-0
Curves
These graphs are designed to be printed in landscape mode. They will print properly on most printers in their current page set-up of 100%. However, some printers may require adjustments to the browser page set-up in order to have the graph print on a single 8 1/2 x 11 inch sheet of paper.
Characteristic
Spectral Sensitivity
120 emulsion has double-peaked sensitivity at approximately 640 and 710 nm. These dual peaks provide excellent response to such laser emissions as: He-Ne (633 nm), Krypton (647 nm), and Ruby (694 nm). High inherent sensitivity in the blue-UV region may make 120 Plate useful for dual-wavelength holography involving both direct (694 nm) and frequency-doubled (347 nm) radiation from ruby lasers.
Note: The contents of this publication are subject to change without notice.
Note: If you have questions or need assistance, contact your local Kodak representative.
Footnotes\Notices
NOTICE: The data in this publication represent product tested under the conditions of exposure and processing specified. They are representative of production coatings, and therefore do not apply to a particular box or roll of photographic material. They do not represent standards or specifications that must be met by Eastman Kodak Company. The company reserves the right to change and improve product characteristics at any time.
Kodak claims 6um and Saxby's latest book says 58nm so yeah, should have looked at that first although I was mainly curious as to if anyone was actually using this emulsion at all.
I used it a couple of times. The sensitivity was lower than Agfa (ie the exposure time was shorter - consistent with larger grain size. I can never get this sensitivity stuff right - low sensitivity means longer exposure right?) Anyway, it was consistent with the larger grain size reported by Hans. I imagine that would matter if you were making holograms with low wavelengths at large angles. The main complaint, to my mind was that it was very expensive compared to Agfa. Also, if memory serves, the glass was very thin and the plate holder we were using at ABN was made for Agfa plates. This meant either finding an another alternative to Agfa or making new plateholders. All this, as you can guess, was about the time that Agfa sent that circular about quitting the Holotest series.
No, sensitivity is a measure of the susceptability of a thing to some stimulus, so high sensitivity means less energy is required for exposure. I was puzzled at first by your mix-up, but then I recall having seen a description of a video camera that claimed as a feature "low light sensitivity" which it turns out meant that it worked well with low levels of light, and in fact had high light sensitivity
Thanks. I generally work with the numbers, ie DCG is (approx) 100 mJ/sq cm, Silver is 1 mJ/sq cm etc. I then calculate my exposure based on these, look at the result and tweak accordingly, since these figures are idealised. The word "sensitivity" has always confused me because I've seen "low sensitivity" to mean both low exposure and high exposure.
In a similar vein, to photographers red is "hot", however the color temperature of red is low and hence, in photometric terms, red is "cool". Many years ago I wrote a paper on how the color temperature of a bulb depended on the applied voltage and affected the holographic reconstruction. I was criticised for this color temp mixup until Kaveh realised the confusion and explained it.
In theater we use hot and cool very often. It seems to come from the concept that if you want it to look like winter you need to add blue to the light like a north light with a low noon sun. For beach scenes we always use violet or rose to had some "heat". It has more to do with the emotions than the physics.
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glass plates.
Unfortunately, due to unfavorable business conditions, Eastman Kodak
Company discontinued glass plates and exited the photographic glass
plate business on December 31, 2002.
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