Active Chirp Compensation for Ultrabroadband Optical Pulses

Yamashita, Mikio; Morita, Ryuji; Karasawa, Naoki

doi:10.1007/3-540-27140-6_3

Cited by 1 publication

(2 citation statements)

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“…The relation between the recombination time t and the emitted photon energy NðtÞ is very important for providing information not only on the time-frequency relation of an emitted harmonic photon but also on the intrinsic group delay in the harmonic emission processes [23]. This is because the inverse function tðNÞ of the recombinationtime-dependent harmonic energy NðtÞ corresponds to the frequency-dependent group delay t DG ðωÞ in the field of femtosecond optics [31,33,34]. Accordingly, the first derivative of the harmonic-order-dependent recombination time tðNÞ with respect to the harmonic frequency N, ϕ 00 ðNÞ ¼ dtðNÞ=dN, describes the intrinsic GDD, which is the most important parameter for the attosecond pulse broadening.…”

Section: Theoretical Models For Numerical Calculationmentioning

confidence: 99%

“…6(a)] corresponds to the group delay t DG ðωÞ, defined as the first derivative of the spectral phase ϕðωÞ with respect to the angular frequency ω, the slope dtðNÞ=dN is the GDD [ϕ 00 ðNÞ ¼ d 2 ϕðωÞ=dω 2 ; see Fig. 6(b)] [31,33,34], which broadens the attosecond pulse duration. By carrying out the inverse Fourier transform (IFT) using the harmonic-order-dependent GDD ϕ 00 S-j ðNÞ [see Fig.…”

Section: Isolated Attosecond Pulse Shortening: the Intrinsic Dispersimentioning

confidence: 99%

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Isolated attosecond pulse generation by monocycle pumping: the use of a harmonic region with minimum dispersion

et al. 2010

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The detailed theoretical investigation into the spectral phase and intrinsic dispersion of high-order harmonics generated by monocycle pumping [a 1:93 fs (T 0 ), 580 nm (λ 0 ), 1:7-2:0 × 10 15 W=cm 2 (I 0 ), Gaussian-shaped pulse] showed that it is significantly important for further shortening of isolated attosecond pulses to select the spectral region that has the minimum intrinsic group-delay dispersion and higher-order dispersion in the middle region of the plateau, other than that close to the cutoff where the harmonic intensity drops rapidly. We demonstrated that the selection is carried out directly from the harmonic-order-dependent electron-recombination time, which is obtained from the simple semiclassical method and can be measured by experiment. Consequently, we found that monocycle pumping can generate efficiently 68 as isolated pulses without chirp compensation as well as tunable (115 to 150 eV), sub 70 as pulses from He atoms by tuning the carrier-envelope phase. Particularly, nearly transform-limited 43 as isolated pulses can be produced under the double-intensity (I pump ¼ 2I 0 ) and doublewavelength (λ pump ¼ 2λ 0 , T pump ¼ 2T 0 ) pump. These results were also confirmed by the saddle-point analysis based on the Lewenstein model.

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