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Efficient generation of isolated attosecond pulse with CEP-unstabilized multicycle infrared double optical gating
| Content Provider | Semantic Scholar |
|---|---|
| Author | Lan, Po-Hsiang Takahashi, E. J. Midorikawa, Katsumi |
| Copyright Year | 2011 |
| Abstract | We proposed and theoretically demonstrated an optimized gating scheme, which we called infrared double optical gating (IRDOG), to create isolated attosecond pulses (IAPs) with a multicycle CEP-unstabilized laser pulse. This scheme is based on the combination of the conventional PG and the recently reported two-color optimized infrared synthesis gating schemes [1,2]. Two counter-rotating, circularly polarized Ti:sapphire laser pulses (800 nm) with a proper delay are utilized as the main driving pulse. In addition, a weak IR pulse at 1300 nm is synthesized with the main driving pulse to control the generation of attosecond pulse. It also can be easily generalized to the elliptically polarized laser case, called generalized infrared double optical gating (GIRDOG). We have theoretically demonstrated this scheme with the Lewenstein model by including the propagation effects. Figure 1 (a) shows the harmonic spectrum generated in the GIRDOG scheme using two 42-fs counterrotating elliptically polarized laser pulses with a delay of 54 fs. We can see that supercontinuum high harmonics can be obtained though 25-th harmonics, from which IAP can be generated. As shown in Fig. 1(b), IAPs are generated for most CEPs although its intensity changes with the CEP shift. Therefore, a CEP-unstabilized high-power multicycle laser pulse can be used to create the IAP. In addition, as shown in Fig.1 (c), IRDOG and GIRDOG schemes dramatically reduce the ionization of the target comparing with the conventional DOG and GDOG methods [3,4]. This is a great advantage for efficiently generating the intense IAP by employing the well-established phase-matching and energy-scaling method with a high-power laser. Thus the IRDOG and GIRDOG schemes will open the door for the generation of high flux IAP. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.riken.jp/ExtremePhotonics/atto/No.5_2011.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
