The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 22, 2003
Filed:
Jul. 05, 2001
Leon Bademian, Stafford, VA (US);
Alex B. Stone, Vienna, VA (US);
Isomet, Inc., Springfield, VA (US);
Abstract
An optical device includes a first birefringent crystal having a refractive index difference &Dgr;n and a length l and a second birefringent crystal having a refractive index difference &Dgr;n and a length l . The first and second birefringent crystals are 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 first birefringent crystal, pass through the first birefringent crystal, enter the face of the second birefringent crystal, and pass through the second birefringent crystal The face of the first birefringent crystal and the face of the second birefringent crystal are tilted relative to each other. The tilting adjusts at least the path length of optical beam through the first birefringent crystal, thereby permitting a precisely tuned frequency response without requiring corresponding precision in the length of the crystals. The first and second birefringent crystals may be temperature compensated whereby a temperature variation of the product of the refractive index difference &Dgr;n and the length l is compensated by a temperature variation of the product of the refractive index difference &Dgr;n and the length I over a desired operating temperature range.