Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Core-clad Pr(3+)-doped Ga(In)-Ge-As-Se-(I) glass fibers: preparation,
  investigation, simulation of laser characteristics   Core-clad fibers on the basis of high-purity 1300 ppmw Pr(3+)-doped
Ga-Ge-As-Se and 2000 ppmw Pr(3+) -doped In-Ge-As-Se-I glasses have been
prepared. The minimum optical losses of the fibers are at the level of 1 dB/m
in the wavelength range, where there is no influence of the praseodymium
absorption. At present, it is the best result obtained for core-clad rare-
earth-doped chalcogenide fibers with high dopant concentration. The fibers
exhibit the broadband luminescence in the spectral range of 3.5-5.5 micron. The
values of luminescence lifetime at the wavelength of 4.7 micron are within
6.5-8.2 ms closed to those for the bulk glasses obtained previously. Simulation
of laser properties for these core-clad fibers in the three-level cascade
scheme was carried out. The low level of optical losses experimentally achieved
in these fibers is one of main criteria for development of mid-IR fiber
systems.

15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
23
The categories of this paper are: solv-int
2
The categories of this paper are: math
9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio
4
The categories of this paper are: cond-mat
6
The categories of this paper are: astro-ph
19
The categories of this paper are: eess
37
The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph