ALEXANDRIA, Va., March 26 -- United States Patent no. 12,259,632, issued on March 25.
"Optical assembly for enlarging spectral bandwidths and reducing ultrashort pulses" was invented by Keming Du (Aachen, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "An optical arrangement for enlarging spectral bandwidths by nonlinear self-phase modulation for shortening ultrashort pulses using a multipass cell and a nonlinear medium. The nonlinear medium is arranged within the multipass cell, and a laser beam having ultrashort pulses passes through the nonlinear medium multiple times. The laser beam is coupled into the multipass cell by way of a shaping optical unit. The laser beam is shaped into an astigmatic bea...