Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Extra Loss-free Non-Hermitian Engineered Single Mode Laser Systems   In a laser system non-Hermitian methods such as Parity-Time (PT) Symmetry and
Supersymmetry (SUSY) have shown and demonstrated the ability to suppress
unwanted lasing modes and, thus, achieved single mode lasing operation through
the addition of lossy passive elements. While these approaches enable laser
engineering versatility, they rely on the drawback of adding optical losses to
a system tasked to produce single mode gain. Unlike PT and SUSY lasers, here we
show an extra loss-free non-Hermitian laser engineering approach to realize
single mode lasing operation for the first time. By selectively enhancing the
fundamental modes quality factor, we obtain single mode operation with higher
output power per cavity since all cavities in this system contribute to the
laser output, in contrast to other non-Hermitian approaches. Furthermore, we
show that this approach interestingly allows reducing the number of
to-be-designed cavities in super-partner array as compared with, for example,
the SUSY approach, thus leading to reduced design complexity upon coupled
cavity scale up of laser arrays. In summary, the ability to engineer coupled
laser systems where each laser cavity contributes to coherent light
amplification opens up a new degree of laser-design freedom leading to
increased device performance and simultaneous reduced design and fabrication
complexity.

25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int
26
The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin