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Phase metrology with multi-cycle two-colour pulses

Petersson, C. L M; Carlström, S. LU ; Schafer, K. J. LU and Mauritsson, J. LU (2016) In Journal of Physics B: Atomic, Molecular and Optical Physics 49(9).
Abstract

Strong-field phenomena driven by an intense infrared (IR) laser depend on during what part of the field cycle they are initiated. By changing the sub-cycle character of the laser electric field it is possible to control such phenomena. For long pulses, sub-cycle shaping of the field can be done by adding a relatively weak, second harmonic of the driving field to the pulse. Through constructive and destructive interference, the combination of strong and weak fields can be used to change the probability of a strong-field process being initiated at any given part of the cycle. In order to control sub-cycle phenomena with optimal accuracy, it is necessary to know the phase difference of the strong and the weak fields precisely. If the... (More)

Strong-field phenomena driven by an intense infrared (IR) laser depend on during what part of the field cycle they are initiated. By changing the sub-cycle character of the laser electric field it is possible to control such phenomena. For long pulses, sub-cycle shaping of the field can be done by adding a relatively weak, second harmonic of the driving field to the pulse. Through constructive and destructive interference, the combination of strong and weak fields can be used to change the probability of a strong-field process being initiated at any given part of the cycle. In order to control sub-cycle phenomena with optimal accuracy, it is necessary to know the phase difference of the strong and the weak fields precisely. If the weaker field is an even harmonic of the driving field, electrons ionized by the field will be asymmetrically distributed between the positive and negative directions of the combined fields. Information about the asymmetry can yield information about the phase difference. A technique to measure asymmetry for few-cycle pulses, called stereo-ATI (above threshold ionization), has been developed by Paulus et al (2003 Phys. Rev. Lett. 91 253004). This paper outlines an extension of this method to measure the phase difference between a strong IR and its second harmonic.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
above-threshold ionization, attosecond physics, phase metrology
in
Journal of Physics B: Atomic, Molecular and Optical Physics
volume
49
issue
9
publisher
IOP Publishing
external identifiers
  • scopus:84965102507
  • wos:000374698300009
ISSN
0953-4075
DOI
10.1088/0953-4075/49/9/095002
language
English
LU publication?
yes
id
95470ab3-a24c-461f-9e29-4ce233df6b59
date added to LUP
2016-09-30 14:53:24
date last changed
2017-01-01 08:35:38
@article{95470ab3-a24c-461f-9e29-4ce233df6b59,
  abstract     = {<p>Strong-field phenomena driven by an intense infrared (IR) laser depend on during what part of the field cycle they are initiated. By changing the sub-cycle character of the laser electric field it is possible to control such phenomena. For long pulses, sub-cycle shaping of the field can be done by adding a relatively weak, second harmonic of the driving field to the pulse. Through constructive and destructive interference, the combination of strong and weak fields can be used to change the probability of a strong-field process being initiated at any given part of the cycle. In order to control sub-cycle phenomena with optimal accuracy, it is necessary to know the phase difference of the strong and the weak fields precisely. If the weaker field is an even harmonic of the driving field, electrons ionized by the field will be asymmetrically distributed between the positive and negative directions of the combined fields. Information about the asymmetry can yield information about the phase difference. A technique to measure asymmetry for few-cycle pulses, called stereo-ATI (above threshold ionization), has been developed by Paulus et al (2003 Phys. Rev. Lett. 91 253004). This paper outlines an extension of this method to measure the phase difference between a strong IR and its second harmonic.</p>},
  articleno    = {095002},
  author       = {Petersson, C. L M and Carlström, S. and Schafer, K. J. and Mauritsson, J.},
  issn         = {0953-4075},
  keyword      = {above-threshold ionization,attosecond physics,phase metrology},
  language     = {eng},
  month        = {04},
  number       = {9},
  publisher    = {IOP Publishing},
  series       = {Journal of Physics B: Atomic, Molecular and Optical Physics},
  title        = {Phase metrology with multi-cycle two-colour pulses},
  url          = {http://dx.doi.org/10.1088/0953-4075/49/9/095002},
  volume       = {49},
  year         = {2016},
}