Abstract
Abstract. A stable optical resonator comprising a spherical rear mirror with a phase step of λ∕2 at its center anda flat output coupler promises to produce a beam with very low diffraction. Based on this premise, a phase stepmirror is fabricated on oxygen-free high-conductivity copper substrate using single-point diamond turningmethod for use in kilowatt-class CO 2 laser. The fabrication technique and subsequent metrology measurementsof the optical component, e.g., surface profile error and surface finish, are discussed. © 2014 Society of Photo-OpticalInstrumentation Engineers (SPIE) [DOI: 10.1117/1.OE.53.3.036107] Keywords: single-point diamond turning; laser resonators; phase step; mirror.Paper 131859 received Dec. 10, 2013; revised manuscript received Feb. 12, 2014; accepted for publication Feb. 25, 2014; publishedonline Mar. 21, 2014. 1 IntroductionIn recent experiments, a new type of CO 2 laser beam withlow diffraction was demonstrated using a λ∕2 phase stepat the center of the rear mirror of the optical resonator.The near-field as well as the far-field peak intensity ofthis beam was found to be much higher than that of the fun-damental TEM
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