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Novel technique for mode selection in a multimode fiber laser

Title
Novel technique for mode selection in a multimode fiber laser
Author
김지원
Keywords
Spectral response; Selective excitations; Mode filtering; Output beam; germanium; Fibers; Feedback elements; theoretical model; Thulium; Beam propagation factor; Volume Bragg gratings; laser; Feedback; Lasers; instrumentation; Higher-order modes; Multi-mo
Issue Date
2011-06
Publisher
Optical Society of America
Citation
Optics Express, v. 19, NO. 13, Page. 12434-12439
Abstract
A simple technique for transverse mode selection in a large-mode-area (multimode) fiber laser is described. The technique exploits the different spectral responses of feedback elements based on a fiber Bragg grating and a volume Bragg grating to achieve wavelength-dependent mode filtering. This approach has been applied to a cladding-pumped thulium-doped fiber laser with a multimode core to achieve a single-spatial-mode output beam with a beam propagation factor (M-2) of 1.05 at 1923 nm. Without mode selection the free-running fiber laser has a multimode output beam with an M2 parameter of 3.3. Selective excitation of higher order modes is also possible via the technique and preliminary results for laser oscillation on the LP11 mode are also discussed along with the prospects for scaling to higher power levels. (C)2011 Optical Society of America
URI
https://opg.optica.org/oe/fulltext.cfm?uri=oe-19-13-12434&id=218837https://repository.hanyang.ac.kr/handle/20.500.11754/184437
ISSN
1094-4087
DOI
10.1364/OE.19.012434
Appears in Collections:
COLLEGE OF SCIENCE AND CONVERGENCE TECHNOLOGY[E](과학기술융합대학) > PHOTONICS AND NANOELECTRONICS(나노광전자학과) > Articles
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