Abstract
Recently, a new class of laser resonators was introduced that utilizes diffractive mirrors and an additional intracavity diffractive phase element. High modal discrimination and low fundamental-mode loss were achieved simultaneously by use of sinusoidal and pseudorandom diffractive phase elements. An intracavity phase element consisting of a simple single-step phase modulation is approximated by a Gaussian with a small radius. Explicit expressions are obtained for the modal-discrimination factor as a function of resonator parameters with a Gaussian output mirror. Numerical simulations are performed for a phase element with a step singularity in the phase function, the fundamental mode of this cavity being super-Gaussian. The modal discrimination of the cavity is studied for different radii of the single-step phase modulation, the position of the phase plate, and the cavity Fresnel number. Optimum solutions are found for a plane output mirror with either a striped or a circular shape.
© 1999 Optical Society of America
Full Article | PDF ArticleMore Like This
James R. Leger, Diana Chen, and Greg Mowry
Appl. Opt. 34(14) 2498-2509 (1995)
James R. Leger, Greg Mowry, and Xu Li
Appl. Opt. 34(21) 4302-4311 (1995)
Karsten Ballüder and Mohammad R. Taghizadeh
Appl. Opt. 38(27) 5768-5774 (1999)