Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Scalable terahertz generation by large-area optical rectification at 80
  TW laser power   We demonstrate high-energy terahertz generation from a large-aperture (75 mm
diameter) lithium niobate wafer by using a femtosecond laser with energy up to
2 J. This scheme utilizes optical rectification in a bulk lithium niobate
crystal, where most terahertz energy is emitted from a thin layer of the rear
surface. Despite its simple setup, this scheme can yield 0.19 mJ of terahertz
energy with laser-to-terahertz conversion efficiencies of ~0.01%, about 3 times
better than ZnTe when pumped at 800 nm. The experimental setup is up-scalable
for multi-mJ terahertz generation with petawatt laser pumping.

32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess