After a long build, high harmonics are being generated. Without much optimization yet, we are recording about 40 nA of photocurrent from a stainless steel plate and the signal goes away upon insertion of a LiF window, meaning the photon energy is above 10 eV. The picture shows the plasma at the end of a glass nozzle at the intracavity focus. The harmonics are reflected off the sapphire wafer at Brewster’s angle into the pipe at the lower right of the picture, which goes towards the monochromator chamber.
