A single-mode fiber laser based on an intracavity core-cladding mode conversion is demonstrated. The fiber laser consists of an Er-doped active fiber and two fiber Bragg gratings. One Bragg grating is a core-cladding mode converter, and the other Bragg grating is a narrowband high reflector that selects the lasing wavelength. Coupling a single core mode and a single cladding mode by the grating mode converter, the laser operates as a hybrid single-mode laser. This approach for designing a laser cavity provides a much larger mode area than conventional large-mode-area step-index fibers.
© 2008 Optical Society of America
Fiber Optics and Optical Communications
Original Manuscript: October 19, 2007
Manuscript Accepted: December 7, 2007
Published: February 12, 2008
Shigeru Suzuki, Axel Schülzgen, and N. Peyghambarian, "Single-mode fiber laser based on core-cladding mode conversion," Opt. Lett. 33, 351-353 (2008)