title: Edge-wave method for calculating the output mode of strip unstable resonators.
abstract: We develop an edge-wave method for calculating the output mode of a positive branch off-axis unstable resonator. According to the iterative property of the edge-wave function, the transmission line of the apertures is adopted to solve the Fox-Li iteration for calculating the lowest loss mode on the output plane. Furthermore, the so-called mask effect is eliminated by revising the edge-wave function derived from the last order aperture, so that the modified formula can be utilized to calculate the output mode directly. The method can be employed in most cases, with an exception at the mode crossing point.
authors.forename: Chao
authors.initials: C
authors.lastname: Wu
authors.forename: Gen
authors.initials: G
authors.lastname: Li
authors.forename: Xiahui
authors.initials: X
authors.lastname: Tang