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.
We have now assembled the last part of the beamline connecting the surface science chamber to the HHG source. Pictures are graduate students Peng Zhao and Xinlong Li and postdoc Chris Corder.
Now, just add photons…. coming soon!
Xinlong Li has been admitted, and will remain in our group as a Ph. D. student in Physics. He will continue his work on high-power fiber lasers, cavity enhanced HHG, and attosecond physics. Congratulations to Xinlong!
Our web server got hacked, so our site was down for a while… but now we are up and running again on a new server: the Sinology DS1515!