Weiyi Hong et al 2007 J. Phys. B: At. Mol. Opt. Phys. 40 2321 doi:10.1088/0953-4075/40/12/008
Weiyi Hong, Peixiang Lu, Wei Cao, Pengfei Lan and Xinlin Wang
Show affiliationsThe time–frequency properties of high-order harmonic generation in the presence of a static electric field are investigated. It is found that the quantum paths contributing to the harmonics can be controlled by adding a static electric field. The highest photon energies of harmonics emitted in the adjacent half-cycles of the laser field are modulated by the static electric field, and then an attosecond pulse train with one burst per optical cycle can be extracted. For the ratio between the laser and the static field of 0.39, the harmonic spectrum is extended to Ip + 9.1Up, and the harmonics above Ip + 0.7Up are emitted almost in phase. The phase-locked harmonics covered by a broad bandwidth are produced, and then a regular attosecond pulse train with a pulse duration of 80 as is generated.
42.65.Ky Frequency conversion; harmonic generation, including higher-order harmonic generation
32.80.-t Photoionization and excitation
42.65.Re Ultrafast processes; optical pulse generation and pulse compression
Issue 12 (28 June 2007)
Received 2 March 2007, in final form 28 April 2007
Published 5 June 2007
Weiyi Hong et al 2007 J. Phys. B: At. Mol. Opt. Phys. 40 2321
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