[pyroguy_3]

Hello all, I am trying to find a semi-inexpensive solution to a problem I face. My graduate research centers around using the cavity ringdown technique to observe the kinetics of atmospheric-like reactions. We use an Ar-F laser as our excitation source, and a YAG laser coupled with a dye-system for the ringdown production. I am looking for a way to take our excitation beam and turn it 90 degrees before it enters the cavity. We had a periscope system , but it was incredibly inefficient, and the power was cut at least in half after making it through. The only solutions I can come up with are fairly expensive prisms. Any ideas would be greatly appreciated.

Andrew

[enahs]

Maybe I am confused by what you mean by "turn it 90 degrees", but the obvious answer is a mirror.

[pyroguy_3]

Okay, that is a little unclear. I guess "rotate it 90 degrees" would have been better. The beam comes out taller than it is wider. I want it wider than it is taller. Thus I would have to rotate it somehow.