Phys. Rev. Lett. 70, 766–769 (1993)High-order harmonic generation using intense femtosecond pulsesReceived 21 September 1992; published in the issue dated 8 February 1993 Neon gas excited by 800-nm laser pulses (15 mJ, 125 fsec) at an intensity near 1015 W/cm2 generates harmonics up to 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 harmonic (>91st) is reached. © 1993 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.70.766
DOI:
10.1103/PhysRevLett.70.766
PACS:
42.50.Hz, 32.80.Rm, 42.65.Ky, 42.65.Re
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