Abstract
We numerically calculate the high-order harmonic generation (HHG) power spectra from a one-dimensional model atom irradiated by linearly polarised 12 fs two-colour laser pulses composed of a fundamental pulse from Ti:sapphire laser and its second harmonic. It is found that a distinct double plateau structure appears when the relative phase of the two pulses is set as π/8, 2π/8 or 3π/8, and the double plateau structure disappears when the relative phase is set as 4π/8, 5π/8, 6π/8 or 7π/8. The relative-phase-dependent plateau structure is explained by the temporal profile of the synthesised electric fields as well as the semi-classical “three-step” model. Moreover, our numerical result shows that cut-off frequencies of the two-colour pulse HHG spectra can be exactly predicted by use of the semi-classical “three-step” model.
Similar content being viewed by others
References
R.A. Bartels, A. Paul, H. Green, H.C. Kapteyn, M.M. Murnane, S. Backus, I.P. Christov, Y. Liu, D. Attwood, C. Jacobsen, Science 297, 376 (2002)
T. Shiraishi, M. Mori, K. Kondo, Phys. Rev. A 65, 045201 (2002)
S.X. Hu, L.A. Collins, Phys. Rev. Lett. 96, 073004 (2006)
P.B. Corkum, Phys. Rev. Lett. 71, 1994 (1993)
Y. Oishi, M. Kaku, A. Suda, F. Kannari, K. Midorikawa, Opt. Express 16, 7230 (2006)
T. Pfeifer, L. Gallmann, M.J. Abel, D.M. Neumark, S.R. Leone, Opt. Lett. 31, 975 (2006)
W. Cao, P.X. Lu, P.F. Lan, X.L. Wang, G. Yang, Opt. Express 15, 530 (2006)
P.F. Lan, P.X. Lu, W. Cao, Y.H. Li, X.L. Wang, Phys. Rev. A 76, 011402(R) (2007)
D.B. Milošević, B. Piraux, Phys. Rev. A 54, 1522 (1996)
C.F.M. Faria, D.B. Milošević, G.G. Paulus, Phys. Rev. A 61, 063415 (2000)
C.F.M Faria, W. Becker, M. Dörr, W. Sander, Laser Phys. 9, 388 (1999)
C.F.M. Faria, L.M. Du, Phys. Rev. A 64, 023415 (2001)
J.H. Eberly, Q. Su, J. Javanainen, Phys. Rev. Lett. 62, 881 (1989)
G. Chen, J.G. Chen, Y.J. Yang, H.Y. Zhu, W.H. Du, F.P. Chi, Q.R. Zhu, Chin. Phys. Lett. 22, 584 (2005)
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Chen, G., Chen, J., Yang, Y. et al. Effect of the relative phase between two-colour pump pulses on structure of harmonic spectra. Eur. Phys. J. D 57, 145–149 (2010). https://doi.org/10.1140/epjd/e2009-00325-0
Received:
Revised:
Published:
Issue Date:
DOI: https://doi.org/10.1140/epjd/e2009-00325-0