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No, you can't just replace the flashlamp in your home-built dye laser with a bunch of salvaged laser diodes out of old CD player or laser pointers! (From: A.E. Siegman (siegman@ee.stanford.edu).) Anyone wanting to play with home-made dye lasers might look at an article by Richard Scheps, "Low threshold visible dye laser pumped by visible laser diodes", IEEE Photonics Technology Letters, vol 5, 1156 (October 1993). Experiments were done using two 10 mW visible diode lasers (a.k.a. "super laser pointers") as pumps; the threshold was 5.6 mW. The dye was actually in a 100 micron thick jet, which is not all that easy to make; but I'd bet that with some care it could be done with a thin dye cell. Also, laser wavelength was 758 nm, which is not really visible. But also, this was 6 years ago - with some ingenuity an experimentalist might be able to something similar "at home". (From: Joshua Halpern (jbh@IDT.NET).) You can do it using razor blades, or smooth glass plates to form the jet. It takes a bunch of fussing, and can be pretty messy learning how to do it, but it works. OTOH, just use the EtGlycol without the dye until the jet is working. Thin cells will probably have too much reflective loss to work. You might look in RSI between bout 1974 and 1980 for jet designs. An interesting idea.