Patent ID: 6594022
Filing Date: 2003-07-15
Classification: G01J,H01S

Abstract:
A wavelength reference apparatus for use in calibrating a device such as a tunable Fabry-Perot filter or a tunable VCSEL emitting laser radiation to a precise, absolute frequency, the wavelength reference apparatus comprising:a collimation device for collimating a portion of the laser radiation; a Fizeau interferometer for receiving the collimated laser radiation, said Fizeau interferometer having a first plate and a second plate, said first plate and said second plate being set at an inclination with respect to one another, and said first plate being set at an inclination with respect to an optical path of said portion of the collimated laser radiation from said collimation device; and a position sensitive detector for determining a position of maximum reflected power of the collimated laser radiation along a long axis of said second plate of said Fizeau interferometer, said position sensitive detector generating an electrical output based on the position of maximum reflected power of the collimated laser radiation along said long axis of said second plate of said Fizeau interferometer.