Fabrication of λ/2 phase step mirror for CO2 laser resonator using diamond turning

Vinod Mishra; Abhik K. Biswas; Neeraj Kumar; L. M. Kukreja; RamaGopal V. Sarepaka

doi:10.1117/1.oe.53.3.036107

Abstract

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A stable optical resonator comprising a spherical rear mirror with a phase step of λ/2 at its center and a flat output coupler promises to produce a beam with very low diffraction. Based on this premise, a phase step mirror is fabricated on oxygen-free high-conductivity copper substrate using single-point diamond turning method for use in kilowatt-class CO 2 laser. The fabrication technique and subsequent metrology measurements of the optical component, e.g., surface profile error and surface finish, are discussed.

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Fabrication of λ/2 phase step mirror for CO2 laser resonator using diamond turning

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