Journal
LASER PHYSICS LETTERS
Volume 15, Issue 9, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1612-202X/aacb48
Keywords
optical fiber lasers; multi-wavelength; optical vortices; few-mode fiber grating
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Funding
- National Natural Science Foundation of China [61178008, 61275092]
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We experimentally demonstrate a multiwavelength fiber ring laser with tunable orbital angular momentum (OAM) beam output. The laser is embedded with a few-mode fiber Bragg grating and a mode selective coupler (MSC). The mode conversion from LP01 mode to LP11 mode is realized by using the MSC as a mode converter. By rotating a polarizer set at the output end of the MSC, the topological charge of the OAM beam can be tuned from l = - 1 to l = +1 and thus a tunable OAM beam is obtained. By adjusting the polarization controllers (PCs), the laser can operate under single-, dual- and triple-wavelength lasing conditions.
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