![]() ![]() ![]() At least with the layers coated on glass it sometimes appeared to be advantageous heating them exclusively from the rear side (with a hairdryer). During the alcohol dehydration step the SPB gelatin seems to behave differently. The wavelength shift is much harder to control - though as of now I've seen anything from violet to red images with my gelatin. With the diazo it looks somewhat different. Particularly with FEG extremely broad banded holograms could be made, but relatively monochromatic red images as well. Exposing my kitchen gelatin at 405nm, I could easily make bright gold images with DCG and FEG (. I guess it largely depends on the specific type of gelatin. Thanks for the collaboration, this is exciting! I'm thinking just making some plain gratings with each laser to begin with. I work my regular job Tues-Sat but will have some time after work to demold, dry, and cut up the plates. With so many possible variables, it's difficult to say this was certainly the cause but it seems likely at this point. Plates would undergo quite a bit of dark reaction overnight, and be nearly unusable after two days dry at room temp, even in darkness. I used to add glycerol (around 1% of final volume) to my DCG emulsion but found I got much better storage if this was omitted. Plate 1 had the super-hold tape and so will be a thicker layer. Added a second 1.0 mL of 1% safranin to the remaining emulsion and mold coated the second plate following the first. I checked an aliquot of the emulsion after coating the first plate and noted it was fairly faintly colored. Placed in (dedicated, non-food) refrigerator for overnight gelling. Allowed emulsion to fill the entire surface. Lowered upper plate (thick rain-X glass) onto lower (clean) plate. Removed warmed plates, placed upon prepared paper towels on a level surface. Sheets into the (holography dedicated, filtered air) food dehydrator at 130 F. Dried both sheets with microfiber cloth then wiped with lint-free cleanroom wipe. I prefer the "super hold" tape but nearly ran out on the first plate.think ahead next time.Ĭleaned thick glass previously coated with rain-X following same procedure. Scotch transparent for one, Scotch "super hold" for the other. Applied two strips of tape to each long edge. Rinsed with DI water, making sure the water break test passes. Turned off stirring to allow bubbles to riseĬleaned 10x12 glass sheet with non scratch pad, hot water, and my favorite mix of laundry detergent, oxi-clean, and TSP. The absorption of safranin at 445 is relatively low, hopefully results will still allow some conclusions. Probably within the noise of my meter.Īdded 1.0 mL of 1% safranin O - because the 405 was not going to be an option for this weekend, I wanted to have a higher chance of success. pH was almost unchanged upon addition of diazo sensitizer: 5.40 before, 5.35 after. Filled 3/4 full with DI water as per instructions.Īdded 1.0 mL prepared diazo sensitizer. Speedball diazo sensitizer - comes as a viscous dark liquid inside an empty-feeling bottle. Keep beaker covered with new plastic sandwich bag to exclude dust. The emulsion and prep were as follows, largely following my typical DCG workflow:ġ1 g gelatin (Superclear 300 bloom, from Amazon) This brings me to a question I have had for a while - when beam exposures are quoted in mW/cm^2, how is this calculated with a beam intensity that is not uniform across the entire plate? Quote for a single point and measure the properties at that point in the finished hologram? The 445 is a commercial ECDL with an asymmetrical beam, but the other two are Sapphires and give excellent even (gaussian) exposure. With that in mind, I have the 445, 488, and 568 all aligned and ready to go. As we know, green is the most visible at equal power. It would seem that 405 would tend to produce great bright green replay under the same conditions. My exposures in standard DCG with the 445 and 488 are easier to make bright gold than anything else, and this represents a rather large redshift from the recording wavelengths. ![]() I too suspect 405 is underrated for display work. My table and especially the shutter depends on this so I want to complete it before using the 405. I also do not yet have a dichroic mirror for this wavelength yet (coming soon from ebay) to make it colinear with the other lasers and direct it through the same spatial filter. Attempting to realign it was not immediately successful and I had limited time today so wanted to move on to making emulsion and plates. My 405 nm laser is a homemade ECDL which was operating well at the electronics bench, but became misaligned when bringing it into the laser room. I would usually make more for a weekend session but this is experimental, and I want my thick rain-X plates back to make regular DCGs for sale. Alright, two 10x12 (8x10 effective after edges are cut off) mold-coated sheets are in the refrigerator. ![]()
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