Convert a red HeNe to yellow

I've always wanted to play around with HeNe optics to see if I could get something other than red from one. I recently noticed that Sam G. sells HeNe optics of various colors on eBay so I figured I'd give it a shot. I ordered up a set of yellow HeNe optics and spent hours trying to get yellow from a Spectra Physics 127 while at SELEM. Unfortunately it didn't work out, no luck at all.

I tried again this past weekend with a Spectra Physics 124 and finally had success! I would guesstimate that it's only doing 1mW but that's enough for me.

For the HeNe, power supply and optics I think it all cost me right at $150.

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