Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Energetic sub-2-cycle laser with 220 W average power   Few-cycle lasers are essential for many research areas such as attosecond
physics that promises to address fundamental questions in science and
technology. Therefore, further advancements are connected to significant
progress in the underlying laser technology. Here, two-stage nonlinear
compression of a 660 W femtosecond fiber laser system is utilized to achieve
unprecedented average power levels of energetic ultrashort or even few-cycle
laser pulses. In a first compression step 408 W, 320 uJ, 30fs pulses are
achieved, which can be further compressed to 216 W, 170 uJ, 6.3 fs pulses in a
second compression stage. This is the highest average power few-cycle laser
system presented so far. It is expected to significantly advance the fields of
high harmonic generation and attosecond science.

35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat
33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin
27
The categories of this paper are: comp-gas
26
The categories of this paper are: bayes-an
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph