We report periodical frequency modulation of high-order harmonic fields observed by changing the delay between the driving two-color laser fields consisting of the fundamental and its second harmonic (SH) field. The amplitude of modulation has been up to ∼0.4 eV, which is larger than the bandwidth of the fundamental field. Experimental results show that the intensity and chirp of the fundamental field can control this phenomenon. Numerical analysis by solving the time-dependent Schrödinger equation approves of these results and shows that anharmonic frequency components of the SH field have a crucial role in this phenomenon.

© 2010 Optical Society of America

1. Y. Oishi, M. Kaku, A. Suda, F. Kannari, and K. Midorikawa, "Generation of extreme ultraviolet continuum radiation driven by a sub-10-fs two-color field," Opt. Express 14, 7230-7237 (2006). [CrossRef] [PubMed]
2. X. Feng, S. Gilbertson, H. Mashiko, H. Wang, S. D. Khan, M. Chini, Y. Wu, K. Zhao, and Z. Chang, "Generation of isolated attosecond pulses with 20 to 28 femtosecond lasers," Phys. Rev. Lett. 103, 183901 (2009). [CrossRef] [PubMed]
3. E. J. Takahashi, P. Lan, O. D. Mücke, Y. Nabekawa, and K. Midorikawa, "Infrared two-color multicycle laser field synthesis for generating an intense attosecond pulse," Phys. Rev. Lett. 104, 233901 (2010). [CrossRef] [PubMed]
4. A. Fleischer, and N. Moiseyev, "Attosecond laser pulse synthesis using bichromatic high-order harmonic generation," Phys. Rev. A 74, 053806 (2006). [CrossRef]
5. C. Vozzi, F. Calegari, F. Frassetto, L. Poletto, G. Sansone, P. Villoresi, M. Nisoli, S. De Silvestri, and S. Stagira, "Coherent continuum generation above 100 eV driven by an ir parametric source in a two-color scheme," Phys. Rev. A 79, 033842 (2009). [CrossRef]
6. H. C. Bandulet, D. Comtois, E. Bisson, A. Fleischer, H. Pépin, J. C. Kieffer, P. B. Corkum, and D. M. Villeneuve, "Gating attosecond pulse train generation using multicolor laser fields," Phys. Rev. A 81, 013803 (2010). [CrossRef]
7. J. Mauritsson, P. Johnsson, E. Gustafsson, A. L’Huillier, K. J. Schafer, and M. B. Gaarde, "Attosecond pulse trains generated using two color laser fields," Phys. Rev. Lett. 97, 013001 (2006). [CrossRef] [PubMed]
8. N. Dudovich, O. Smirnova, J. Leveseque, Y. Mairesse, M. Yu. Ivanov, D. M. Villeneuve, and P. B. Corkum, "Measuring and controlling the birth of attosecond XUV pulses," Nat. Phys. 2, 781-786 (2006). [CrossRef]
9. J. M. Dahlström, T. Fordell, E. Mansten, T. Ruchon, M. Swoboda, K. Klünder, M. Gisselbrecht, A. L’Huillier, and J. Mauritsson, "Atomic and macroscopic measurements of attosecond pulse trains," Phys. Rev. A 80, 033836 (2009). [CrossRef]
10. N. Ishii, A. Kosuge, T. Hayashi, T. Kanai, J. Itatani, S. Adachi, and S. Watanabe, "Quantum path selection in high-harmonic generation by a phase-locked two-color field," Opt. Express 16, 20876-20883 (2008). [CrossRef] [PubMed]
11. I. J. Kim, C. M. Kim, H. T. Kim, G. H. Lee, Y. S. Lee, J. Y. Park, D. J. Cho, and C. H. Nam, "Highly efficient high-harmonic generation in an orthogonally polarized two-color laser field," Phys. Rev. Lett. 94, 243901 (2005). [CrossRef]
12. A. Amani Eilanlou, Y. Nabekawa, K. L. Ishikawa, H. Takahashi, and K. Midorikawa, "Direct amplification of terawatt sub-10-fs pulses in a CPA system of Ti:sapphire laser," Opt. Express 16, 13431-13438 (2008). [CrossRef] [PubMed]
13. A. Amani Eilanlou, Y. Nabekawa, K. L. Ishikawa, H. Takahashi, E. J. Takahashi, and K. Midorikawa, "Frequency modulation of high-order harmonics depending on the delay between two-color laser fields," CLEO/QELS 2010, paper JThE121.
14. K. L. Ishikawa, "High-harmonic generation," in "Advances in Solid-State Lasers: Development and Applications," ed. by M. Grishin, INTECH, 439-464 (2010).
15. H. J. Shin, D. G. Lee, Y. H. Cha, K. H. Hong, and C. H. Nam, "Generation of nonadiabatic blueshift of high harmonics in an intense femtosecond laser field," Phys. Rev. Lett. 83, 2544-2547 (1999). [CrossRef]

Nat. Phys.

• N. Dudovich, O. Smirnova, J. Leveseque, Y. Mairesse, M. Yu. Ivanov, D. M. Villeneuve, and P. B. Corkum, "Measuring and controlling the birth of attosecond XUV pulses," Nat. Phys. 2, 781-786 (2006). [CrossRef]

Opt. Express

• Y. Oishi, M. Kaku, A. Suda, F. Kannari, and K. Midorikawa, "Generation of extreme ultraviolet continuum radiation driven by a sub-10-fs two-color field," Opt. Express 14, 7230-7237 (2006). [CrossRef] [PubMed]
• N. Ishii, A. Kosuge, T. Hayashi, T. Kanai, J. Itatani, S. Adachi, and S. Watanabe, "Quantum path selection in high-harmonic generation by a phase-locked two-color field," Opt. Express 16, 20876-20883 (2008). [CrossRef] [PubMed]
• A. Amani Eilanlou, Y. Nabekawa, K. L. Ishikawa, H. Takahashi, and K. Midorikawa, "Direct amplification of terawatt sub-10-fs pulses in a CPA system of Ti:sapphire laser," Opt. Express 16, 13431-13438 (2008). [CrossRef] [PubMed]

Phys. Rev. A

• J. M. Dahlström, T. Fordell, E. Mansten, T. Ruchon, M. Swoboda, K. Klünder, M. Gisselbrecht, A. L’Huillier, and J. Mauritsson, "Atomic and macroscopic measurements of attosecond pulse trains," Phys. Rev. A 80, 033836 (2009). [CrossRef]
• A. Fleischer, and N. Moiseyev, "Attosecond laser pulse synthesis using bichromatic high-order harmonic generation," Phys. Rev. A 74, 053806 (2006). [CrossRef]
• C. Vozzi, F. Calegari, F. Frassetto, L. Poletto, G. Sansone, P. Villoresi, M. Nisoli, S. De Silvestri, and S. Stagira, "Coherent continuum generation above 100 eV driven by an ir parametric source in a two-color scheme," Phys. Rev. A 79, 033842 (2009). [CrossRef]
• H. C. Bandulet, D. Comtois, E. Bisson, A. Fleischer, H. Pépin, J. C. Kieffer, P. B. Corkum, and D. M. Villeneuve, "Gating attosecond pulse train generation using multicolor laser fields," Phys. Rev. A 81, 013803 (2010). [CrossRef]

Phys. Rev. Lett.

• J. Mauritsson, P. Johnsson, E. Gustafsson, A. L’Huillier, K. J. Schafer, and M. B. Gaarde, "Attosecond pulse trains generated using two color laser fields," Phys. Rev. Lett. 97, 013001 (2006). [CrossRef] [PubMed]
• X. Feng, S. Gilbertson, H. Mashiko, H. Wang, S. D. Khan, M. Chini, Y. Wu, K. Zhao, and Z. Chang, "Generation of isolated attosecond pulses with 20 to 28 femtosecond lasers," Phys. Rev. Lett. 103, 183901 (2009). [CrossRef] [PubMed]
• E. J. Takahashi, P. Lan, O. D. Mücke, Y. Nabekawa, and K. Midorikawa, "Infrared two-color multicycle laser field synthesis for generating an intense attosecond pulse," Phys. Rev. Lett. 104, 233901 (2010). [CrossRef] [PubMed]
• I. J. Kim, C. M. Kim, H. T. Kim, G. H. Lee, Y. S. Lee, J. Y. Park, D. J. Cho, and C. H. Nam, "Highly efficient high-harmonic generation in an orthogonally polarized two-color laser field," Phys. Rev. Lett. 94, 243901 (2005). [CrossRef]
• H. J. Shin, D. G. Lee, Y. H. Cha, K. H. Hong, and C. H. Nam, "Generation of nonadiabatic blueshift of high harmonics in an intense femtosecond laser field," Phys. Rev. Lett. 83, 2544-2547 (1999). [CrossRef]

Other

• A. Amani Eilanlou, Y. Nabekawa, K. L. Ishikawa, H. Takahashi, E. J. Takahashi, and K. Midorikawa, "Frequency modulation of high-order harmonics depending on the delay between two-color laser fields," CLEO/QELS 2010, paper JThE121.
• K. L. Ishikawa, "High-harmonic generation," in "Advances in Solid-State Lasers: Development and Applications," ed. by M. Grishin, INTECH, 439-464 (2010).

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