Measuring and controlling the birth of attosecond XUV pulses

Generating attosecond pulses has required a radically different approach from previous ultrafast optical methods. The technology of attosecond measurement, however, is built on established methods of characterizing femtosecond pulses: the pulse is measured after it has left the region where it was produced. We offer a completely different approach: in situ measurement. That is, we integrate attosecond-pulse production and measurement in a manner that can be applied to many high-order nonlinear interactions. To demonstrate this approach, we combine a low-intensity (<10−3) second-harmonic beam with the fundamental beam, to gently perturb the production process without significantly modifying it. The attosecond-pulse duration is read from the modulation of the even-harmonic signal as a function of the two-field delay. Increasing the second-harmonic intensity slightly (<10−2), we extend measurement to control. We demonstrate control by manipulating the high-harmonic spectrum with high efficiency.

[1]  Paul Brumer,et al.  Laser control of product quantum state populations in unimolecular reactions , 1986 .

[2]  P. Bucksbaum,et al.  Above-threshold ionisation with a two-colour laser field , 1990 .

[3]  Smith,et al.  Asymmetric photoelectron angular distributions from interfering photoionization processes. , 1992, Physical review letters.

[4]  D. Kane,et al.  Characterization of arbitrary femtosecond pulses using frequency-resolved optical gating , 1993 .

[5]  P. Corkum,et al.  Plasma perspective on strong field multiphoton ionization. , 1993, Physical review letters.

[6]  Watanabe,et al.  Two-color phase control in tunneling ionization and harmonic generation by a strong laser field and its third harmonic. , 1994, Physical review letters.

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

[8]  L'Huillier,et al.  Coherence control of high-order harmonics. , 1995, Physical review letters.

[9]  Liu,et al.  Phase-controlled currents in semiconductors. , 1995, Physical review letters.

[10]  Ivanov,et al.  Routes to control of intense-field atomic polarizability. , 1995, Physical review letters.

[11]  Long,et al.  Polarization-dependent high-order two-color mixing. , 1995, Physical review. A, Atomic, molecular, and optical physics.

[12]  L'Huillier,et al.  Attosecond Pulse Trains Using High-Order Harmonics. , 1996, Physical review letters.

[13]  High-order harmonic amplitude modulation in two-colour phase-controlled frequency mixing , 1999 .

[14]  I. Christov,et al.  Shaped-pulse optimization of coherent emission of high-harmonic soft X-rays , 2000, Nature.

[15]  K. Hong,et al.  Coherent control of high-order harmonics with chirped femtosecond laser pulses. , 2001, Physical review letters.

[16]  U. Heinzmann,et al.  Attosecond metrology , 2007, Nature.

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

[18]  P. Knight,et al.  Role of the intramolecular phase in high-harmonic generation. , 2002, Physical review letters.

[19]  P. Tzallas,et al.  Direct observation of attosecond light bunching , 2003, Nature.

[20]  P. Corkum,et al.  Probing molecular dynamics with attosecond resolution using correlated wave packet pairs , 2003, Nature.

[21]  H. G. Muller,et al.  Attosecond Synchronization of High-Harmonic Soft X-rays , 2003, Science.

[22]  Probing molecular dynamics at attosecond resolution with femtosecond laser pulses. , 2003, Physical review letters.

[23]  P. Corkum,et al.  Attosecond spectral shearing interferometry. , 2003, Physical review letters.

[24]  J. Levesque,et al.  Tomographic imaging of molecular orbitals , 2004, Nature.

[25]  T. Kanai,et al.  Nonlinear optics in the extreme ultraviolet , 2004, Nature.

[26]  Y. Kerachian,et al.  Opticafly injected spin currents in semiconductors , 2000, InternationalQuantum Electronics Conference, 2004. (IQEC)..

[27]  Correlated multielectron dynamics in ultrafast laser pulse interactions with atoms. , 2004, Physical review letters.

[28]  Fully differential rates for femtosecond multiphoton double ionization of neon. , 2004, Physical review letters.

[29]  P. Corkum,et al.  How to use lasers for imaging attosecond dynamics of nuclear processes. , 2004, Physical review letters.

[30]  Eric Cormier,et al.  Self-referencing, spectrally, or spatially encoded spectral interferometry for the complete characterization of attosecond electromagnetic pulses. , 2005, Physical review letters.

[31]  Use of electron correlation to make attosecond measurements without attosecond pulses. , 2005, Physical review letters.

[32]  H. T. Kim,et al.  Highly Efficient High-Harmonic Generation in an Orthogonally Polarized Two-Color Laser Field , 2005 .

[33]  Spatial control of high-harmonic generation in hollow fibers. , 2005, Optics letters.

[34]  J. Caumes,et al.  Controlling two-center interference in molecular high harmonic generation. , 2005, Physical review letters.

[35]  T. Kanai,et al.  Quantum interference during high-order harmonic generation from aligned molecules , 2005, Nature.

[36]  M. Lezius,et al.  Spatial control of recollision wave packets with attosecond precision. , 2005, Physical review letters.

[37]  M. Spanner,et al.  Coulomb and polarization effects in sub-cycle dynamics of strong-field ionization , 2006 .