Optical: systems and elements – Prism – With reflecting surface
Patent
1999-10-04
2000-08-01
Shafer, Ricky D.
Optical: systems and elements
Prism
With reflecting surface
359836, 372 92, 372 93, 372100, 356300, 356436, 356445, G02B 504, G01J 300, G01N 2100, H01S 308
Patent
active
060975555
ABSTRACT:
A stable resonator for a ring-down cavity spectroscopy cell having an optic axis. The resonator includes two Brewster's angle retroreflector prisms, each having a plurality of total internal reflection surfaces. The prisms are disposed in alignment along the optic axis of the resonator. One or both of the prisms can be rotated so that light rays enter and leave a surface of the prism nearly at Brewster's angle to the normal of the prism surface. This feature maintains alignment between the prisms and allows the resonator to be tuned. One of the total internal reflection surfaces of at least one of the prisms may be a curved surface (either a ground curved surface or a surface curved by the addition, through optically contacting or gluing, of a plano-convex lens to the surface). Alternatively, an astigmatic lens may be centered in one arm of the resonator and tilted at Brewster's angle with respect to the optic axis of the resonator. In a preferred embodiment, each of the prisms has an apex angle of about 135.degree. minus Brewster's angle, a second angle of about 90.degree., and a third angle of about 135.degree. minus two times Brewster's angle.
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Lehmann Kevin K.
Rabinowitz Paul
Shafer Ricky D.
Trustees of Princeton University
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