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What is the difference between the "wanted" fringes and the "unwanted" fringes? Since you're using an interferometric method, you're going to get fringes, because that's the point of an interferometric system. In this sense, all fringes are "wanted". Any "unwanted&...

Problem set #1, Question 2: Q. What precautions should you take when working around the types of lasers we use in class? What laser class are they? What are the do's and don'ts? What are the potential threats or risks A. Do not look at laser with remaining eye. Do not point laser at people outside t...

While at 89, it's not a great surprise, nevertheless, I think one of the giants of holography has passed.To me, his book is one of the Triumvirate of Holography Books - The Triple Bible of Holography (along with the books by Collier and Solymar). His derivations in the book have a simplicity to them...

I think it's a good way to get a handle on the way a hologram works. A (roughly) plane wave interfering with a huge number of spherical waves (from various points on the object). This is a slide that Joy uses to show how a hologram works. This was a part of a presentation we gave to Dorkbot about 5...

Just for the record, I got the same message when I tried to upload a pdf.

When optics are set up on a table, I suppose that the redirecting mirrors and other components can move or twist in any way during a long exposure(up/down, side to side, or any variation in three-dimensional space). John felt that up/down twisting or warping was most likely with his table. In that ...

Well, Martin is probably the best person to answer this. But, taking a bit of a speculative stab at it, Li is further up the periodic table than K. The purpose of the Br ion is to re-halogenate the silver speck. Since Li is further up the table, I would assume that it has a lower disassociatian ener...

On the other hand, many holographers claim that processing soft Slavich emulsions such as PFG-03M works best at low temperature. Sure. The rate of reaction depends on the softness of the emulsion, since this would determine the amount of penetration of the solutions into the gelatin matrix. A soft ...

Danny, in order to judge how well the colours are balanced, it's necessary to look at the original object.

It's the temperature at which the film/plate is actually immersed that most affects processing, not the room temperature (within reason). The room temperature/humidity may affect the substrate and/or the emulsion if it's extreme, but to reasonable limits, the room temperature simply warms the surfac...