Patent ID: 6075600
Filing Date: 2000-06-13
Classification: G01D

Abstract:
A signal formation apparatus for use in an interference measurement which comprising:a light emission portion for forming at least two irradiation luminous fluxes, the light emission portion having an incidence waveguide for guiding a coherent irradiation luminous flux from a light source section; a dividing waveguide for dividing the luminous flux from said incidence waveguide into at least two luminous fluxes; at least two emission waveguides divided by said dividing waveguide; and a phase modulator for performing a phase modulation for a luminous flux of at least one of said emission waveguides, said incidence waveguide, said dividing waveguide, said emission waveguides, and said phase modulator being formed on one surface of an optical substrate; anda light receiving portion for receiving a diffracted luminous flux obtained by diffracting and reflecting at least the two luminous fluxes by a scale section, the light receiving portion being formed on the other surface of said optical substrate.