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Reflective polarization retarder and laser apparatus utilizing same

  • US 4,084,883 A
  • Filed: 02/28/1977
  • Issued: 04/18/1978
  • Est. Priority Date: 02/28/1977
  • Status: Expired due to Term
First Claim
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1. For use in laser apparatus having a body of laser material having faces on opposite sides thereof, and through one of said faces linearly polarized laser light is received and then transmitted after being reflected at the other of said faces, a transmissive-reflective polarization rotator disposed on said other face providing rotation of the plane of polarization of the reflected light such that the incident and reflected light are polarized in orthogonal directions, said polarization rotator comprisingpolarizer means disposed upon said face for reflecting one of the p and s polarization components of said linearly polarized incident light and transmitting the other of said p and s polarization components thereof,a reflector means for reflecting said other of said p and s components of said linearly polarized light, andphase adjusting means sandwiched between said polarizing means and said reflecting means for adjusting the phase of said p and s components within said body such that said reflected light is polarized in a direction substantially orthogonal to the incident light.

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