The ATF has presently two lasers:a Nd:YAG laser and a Terawatt CO2 laser. A new Ti:Sapph laser is under installation. The Nd:YAG laser produces controlled mode-locked train of 15-ps FWHM, 30-mJ pulses at a 3 Hz repetition rate. One pulse from this train is directed through second and, then, fourth harmonic crystals to a photocathode generating ~10 ps electron bunches at a photoinjector for the 70-MeV linac.
Another pulse selected from the same train controls an optical switch to produce a 5-ps seed pulse for CO2 laser amplifiers. Amplified to the Terawatt peak power, the CO2 laser beam is used for various experiments. Many of them are based on interaction between the laser and electron beam. Originating from the same mode-locked train allows necessary for such experiments absolute synchronization between the electron- and CO2 laser pulses.
Last Modified: November 5, 2012