Holographyforum.org / holowiki.org

If one gets a narrow peak with a Fabry Perot does it necessarily mean that it is spatially coherent? Can't a beam be very monochromatic but still have terrible spatial coherence? Is the Michelson technique the sure fire way?

I mean simple and cheap.

I'll be there.

I thought it was going to be in Spain.
Whatever, I want to be there.

Anybody know anything about ISDH 2018?

Happy Birthday, Jeff Weil!
We all hope you stay around for many more years.

Just run the output of the C315 into the beam splitter of your choice - glass plate, polarizing cube, or whatever. Then align the two outputs of the beam splitter into your reference and object fibers. A multimode fiber is very easy to align.

I wasted money on single mode fibers. They don't work. Nice thick, 1 mm, multimode fibers work fine if the laser has enough coherence. Toslink cables are cheap and easy to find. Use any ordinary beam splitter to launch into the fibers.

Yes, with enough coherence length, multimode fibers work well for the reference beam. I wish more holographers would give it a try.

Thanks Jeff!