Abstract

A sapphire disk is used as a variable birefringent beam splitter for the linearly polarized pump beam in an oscillator–amplifier dye laser system. Rotation of the disk varies the extent of retardation. The induced elliptical polarization results in a variable back surface reflectance between ≈0.02–0.15 for the green spectral region. Reflectances are measured on two disks with different thicknesses and compared with an approximate model describing the reflectance as a function of angle of rotation of the disk.

© 1981 Optical Society of America

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