title: Beam reshaping by use of spatial solitons in the quadratic nonlinear medium KTP.
abstract: We have demonstrated the transformation of elliptical beams into cylindrically symmetric beams through the formation of quadratic spatial solitons. By use of type II phase-matched second-harmonic generation in a KTP crystal, input elliptical beams with aspect ratios as large as 8:1 were propagated through the KTP crystal, and they exited the crystal as a cylindrically symmetric beam. The threshold for soliton formation and the power throughput were measured versus ellipticity.
authors.forename: R A
authors.initials: RA
authors.lastname: Fuerst
authors.forename: B L
authors.initials: BL
authors.lastname: Lawrence
authors.forename: W E
authors.initials: WE
authors.lastname: Torruellas
authors.forename: G I
authors.initials: GI
authors.lastname: Stegeman