High-Order Harmonic Generation Using Intense Femtosecond Pulses. (Reannouncementwith New Availability Information)

摘要

Neon gas excited by 800-nm laser pulses (15mJ, 125 sec) at an intensity near 1 x10 to the 15th W/sq.cm generates harmonics up to the 109th order. The appearance of successively higher harmonics as the laser intensity is increased is compared to recent calculations of the strong-field atomic response. Blueshifting of the laser and harmonic wavelengths indicates a small degree of ionization until the threshold for the highest harmonics ( > 91st) is reached.