title: Single-transverse-mode output from a fiber laser based on multimode interference.
abstract: An alternative original approach to achieve single-transverse-mode laser emissions from multimode (MM) active fibers is demonstrated. The fiber cavity is constructed by simply splicing a conventional passive single-mode fiber (SMF-28) onto a few centimeters-long active MM fiber section whose length is precisely controlled. Owing to the self-imaging property of multimode interference (MMI) in the MM fiber, diffraction-limited laser output is obtained from the end of the SMF-28, and the MMI fiber laser is nearly as efficient as the corresponding MM fiber laser. Moreover, because of the spectral filtering effect during in-phase MMI, the bandwidth of the MMI fiber laser is below 0.5 nm.
authors.affiliation: College of Optical Sciences, University of Arizona, 1630 East University Boulevard, Tucson, Arizona 85721, USA. xszhu@email.arizona.edu
authors.forename: X
authors.initials: X
authors.lastname: Zhu
authors.forename: A
authors.initials: A
authors.lastname: Schülzgen
authors.forename: H
authors.initials: H
authors.lastname: Li
authors.forename: L
authors.initials: L
authors.lastname: Li
authors.forename: Q
authors.initials: Q
authors.lastname: Wang
authors.forename: S
authors.initials: S
authors.lastname: Suzuki
authors.forename: V L
authors.initials: VL
authors.lastname: Temyanko
authors.forename: J V
authors.initials: JV
authors.lastname: Moloney
authors.forename: N
authors.initials: N
authors.lastname: Peyghambarian