The High-Harmonic-Generation Process (IMAGE) ETH Zurich Department of Physics Caption The photograph is taken during the high-harmonic-generation process in the high-pressure gas cell, with the mid-?infrared input arriving on the right and the soft x-?ray output appearing on the left. Credit ETH Zurich/D-PHYS Keller group Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.