| Title |
Non-Hermitian mode management in periodically modulated waveguide amplifiers / |
| Authors |
Akhter, Mohammad Nayeem ; Botey, Muriel ; Herrero, Ramon ; Staliūnas, Kęstutis |
| DOI |
10.1063/5.0231659 |
| Full Text |
|
| Is Part of |
APL Photonics.. Melville : American Institute of Physics. 2024, vol. 9, iss. 10, art. no. 106115, p. [1-9].. eISSN 2378-0967 |
| Keywords [eng] |
nonlinear systems ; amplifiers ; wave mechanics ; wave propagation ; frequency modulation ; numerical integration ; Complex Ginzburg-Landau equation ; optical elements, optical fibers ; laser materials processing |
| Abstract [eng] |
We propose an efficient mode management scheme in active nonlinear multimode fibers based on non-Hermitian potentials in the longitudinal direction with an antisymmetric transverse profile. The proposal takes advantage of the nonlinear saturation toward particular mode configurations, which can be tuned by the non-Hermitian potential. We demonstrate flexible control of the beam profile within the parameter space of the applied potential with various possibilities, such as improving the beam quality by condensing photons to the lowest order Hermite mode, exciting higher order modes, or engineering a desired mode profile as a combination of modes. The effect is also analytically predicted using a mode-expansion approach, showing good agreement with the full model calculations based on the complex Ginzburg-Landau equation. This study was performed for 1D planar guiding structures, yet the results can be extended to 2D fibers and could be very useful in applications of fiber amplifiers and lasers. |
| Published |
Melville : American Institute of Physics |
| Type |
Journal article |
| Language |
English |
| Publication date |
2024 |
| CC license |
|
