Patent ID: 6597506
Filing Date: 2003-07-22
Classification: G02B

Abstract:
An optical device, comprising:a first birefringent crystal having a refractive index difference &Dgr;n1 and a light path length l1; and a second birefringent crystal having a refractive index difference &Dgr;n2 and a light path length l2, the first and second birefringent crystals being optically aligned and oriented so that a face of the first birefringent crystal and a face of the second birefringent crystal permit at least one optical beam to enter the face of the second birefringent crystal, and pass through the second birefringent crystal, wherein the face of the first birefringent crystal and the face of the second birefringent crystal are tilted relative to each other so as to achieve a path length of the at least one optical beam through the first and second birefringent crystals that provides a predetermined spectral response and wherein a temperature variation of the product of the refractive index difference &Dgr;n1 and the light path length l1 is compensated by a temperature variation of the product of the refractive index difference &Dgr;n2 and the light path length l2 over a desired operating temperature range.