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Single attosecond pulse generation using two-color polarized time-gating technique

Yiping Huo, Zhinan Zeng, Ruxin Li, and Zhizhan Xu

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Abstract

It is proposed that single attosecond pulses be generated via high-order harmonic generation by using a two-color pump pulse with time dependent ellipticity. The two-color pump pulse is created by the fundamental field and its second harmonic: the fundamental field is left-circularly polarized and the second harmonic is right-circularly polarized. Numerical simulations show that single attosecond pulses can be produced in the cut-off region by using the synthesis of 20 fs left-hand and right-hand circularly polarized pulses with a pulse delay of 20 fs. The attosecond pulses produced this way are much stronger than that produced by a few-cycle linear polarized pulse of comparable intensity.

©2005 Optical Society of America

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Figures (4)
Fig. 1.
Fig. 1. The ellipticity (in the x direction) of the synthesis pulses. Solid line: two-color synthesis field and dashed line: one-color synthesis field.

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Fig. 2.
Fig. 2. High-order harmonic spectra with (a) two-color field and (b) few-cycle field. In (a), blue solid line and red dashed line depict the harmonic emission in the x and y directions respectively, while their relative intensities are labeled arbitrarily.

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Fig. 3.
Fig. 3. Temporal profiles of attosecond pulse with (a) two-color field and (b) few-cycle field. Physical conditions are the same as in Fig. 2. The high-order harmonic pulses centered at two different frequencies: 51 ħω and 111 ħω (both in the cut-off). The inset of fig.3 (a) shows the harmonic emission in the x (blue solid line) and y (red dashed line) directions with two-color pump pulse.

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Fig. 4.
Fig. 4. Attosecond pulses in the x direction produced by two-color synthesis pump pulse with different CEP. (a) φ =0; (b) φ =π/4; (c) φ =π//2: (d) φ =3π//4; (e) φ =π.

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Equations (5)

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E ⃑ l ( t ) = Re { E 0 e − 2 ln ( 2 ) ( ( t − T d / 2 ) / τ p ) 2 [ x ̂ e i ( ω t + ϕ ) + y ̂ e i ( ω t + ϕ − π / 2 ) ] × ( − 1 ) n } ,
E ⃑ r ( t ) = Re { E 0 e − 2 ln ( 2 ) ( ( t + T d / 2 ) / τ p ) 2 [ x ̂ e i ( 2 ω t + ϕ ) − y ̂ e i ( 2 ω t + ϕ − π / 2 ) ] × ( − 1 ) n } ,
E ⃑ ( t ) = Re { x ̂ [ e − 2 ln ( 2 ) ( ( t − T d / 2 ) / τ p ) 2 e i ( ω t + ϕ ) + e − 2 ln ( 2 ) ( ( t + T d / 2 ) / τ p ) 2 e i ( 2 ω t + ϕ ) ] + y ̂ [ e − 2 ln ( 2 ) ( ( t − T d / 2 ) τ p ) 2 e i ( ω t + ϕ − π / 2 ) − e − 2 ln ( 2 ) ( ( t + T d / 2 ) / τ p ) 2 e i ( 2 ω t + ϕ − π / 2 ) ] } × ( − 1 ) n .
ξ x ( t ) = ∣ E y ∣ ∣ E x ∣
E ⃑ ( t ) = x ̂ E 0 exp [ − 2 ln ( 2 ) ( t / τ p ) 2 ] cos ( ω t )
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