Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Three ways to select from two attosecond pulses   We demonstrate that by filtering high harmonics it is possible to obtain two
different single attosecond pulses (SAP) resulting from naturally separated
spectral domains formed during propagation in the macroscopic medium. We
propose a feasible experimental configuration in which one can obtain a SAP in
a lower energy domain (<300 eV), or another SAP in a higher energy domain (>300
eV). Without filtering, a double attosecond pulse emission with fixed temporal
separation is obtained. The gap between the two spectral domains is close to
the onset of the water window.

25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex