Phys. Rev. Lett. 83, 722–725 (1999)Absorption-Limited Generation of Coherent Ultrashort Soft-X-Ray PulsesReceived 30 December 1998; published in the issue dated 26 July 1999 Coherent growth of high-order harmonic radiation has been extended to propagation lengths comparable to the XUV absorption length at wavelengths as short as 10 nm range for the first time. Absorption-limited production of high harmonics of sub-10-fs near-infrared laser pulses in gas jets gives rise to a harmonic conversion efficiency of (3–4)×10-8 in the range of 10–13 nm in neon and some 2 orders of magnitude higher at about 30 nm in argon. This kHz-repetition-rate ultrafast soft-x-ray source emits approximately 1010 photons per sec within a 0.9-nm bandwidth of a typical Mo:Si mirror at 13.4 nm in a near-diffraction-limited beam and opens up the way to soft-x-ray nonlinear optics and the measurement of sub-fs soft-x-ray pulses. © 1999 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.83.722
DOI:
10.1103/PhysRevLett.83.722
PACS:
42.65.Ky, 41.50.+h, 42.50.Hz, 42.65.Re
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