Attosecond spectral shearing interferometry.

We show that the complete characterization of arbitrarily short isolated attosecond x-ray pulses can be achieved by applying spectral shearing interferometry to photoelectron wave packets. These wave packets are coherently produced through the photoionization of atoms by two time-delayed replicas of the x-ray pulse, and are shifted in energy with respect to each other by simultaneously applying a strong laser field. The x-ray pulse is reconstructed with the algorithm developed for optical pulses, which requires no knowledge of ionization physics. Using a 800-nm shearing field, x-ray pulses shorter than approximately 400 asec can be fully characterized.

[1]  Ivanov,et al.  Theory of high-harmonic generation by low-frequency laser fields. , 1994, Physical review. A, Atomic, molecular, and optical physics.

[2]  U. Heinzmann,et al.  Time-resolved atomic inner-shell spectroscopy , 2002, Nature.

[3]  P. Corkum,et al.  Measurement of the duration of high harmonic pulses , 1996, Summaries of papers presented at the Conference on Lasers and Electro-Optics.

[4]  H. Muller,et al.  Cross-correlation measurement of femtosecond noncollinear high-order harmonics , 1997 .

[5]  Glover,et al.  Observation of laser assisted photoelectric effect and femtosecond high order harmonic radiation. , 1996, Physical review letters.

[6]  Y. Nabekawa,et al.  27-fs extreme ultraviolet pulse generation by high-order harmonics. , 1998, Optics letters.

[7]  P. Bucksbaum,et al.  Measurement of the Amplitude and Phase of a Sculpted Rydberg Wave Packet , 1998 .

[8]  G. Yudin,et al.  "Jarring" of a quantum system and the corresponding stimulated transitions , 1978 .

[9]  H. G. Muller,et al.  Reconstruction of attosecond harmonic beating by interference of two-photon transitions , 2002 .

[10]  I. A. Walmsley,et al.  Self-referencing spectral interferometry for measuring ultrashort optical pulses , 1999 .

[11]  Ferenc Krausz,et al.  Quantum theory of attosecond XUV pulse measurement by laser dressed photoionization. , 2002, Physical review letters.

[12]  P. Balcou,et al.  Observation of a Train of Attosecond Pulses from High Harmonic Generation , 2001, Science.

[13]  Ferenc Krausz,et al.  X-ray Pulses Approaching the Attosecond Frontier , 2001, Science.

[14]  P. Corkum,et al.  Attosecond streak camera. , 2002, Physical review letters.

[15]  Muller,et al.  Observation of laser-assisted Auger decay in argon. , 1994, Physical review letters.

[16]  A. Scrinzi,et al.  Attosecond cross correlation technique. , 2001, Physical review letters.

[17]  H. Muller,et al.  Ponderomotive streaking of the ionization potential as a method for measuring pulse durations in the XUV domain with fs resolution , 2000 .

[18]  I. Walmsley,et al.  Spectral phase interferometry for direct electric-field reconstruction of ultrashort optical pulses. , 1998, Optics letters.