Fourier-transform optical spectrometer

A Fourier-transform optical spectrometer (102, 104) comprises a planar slab (106); a first optical waveguide (114); a second optical waveguide (116), wherein the first optical waveguide (114) and the second optical waveguide (115) each is in the form of a local modification of the slab (106) and are laterally disposed at the slab (106) parallel to each other; and an optical detector system (108) connected to an unmodified section (112) of the slab (106) and segmented and extending in parallel to the first optical waveguide (114) and the second optical waveguide (116), wherein the first optical waveguide (114) has a propagation mode with a first effective refractive index; the second optical waveguide (116) has a propagation mode with a second effective refractive index different from the first effective refractive index; and the unmodified section (112) of the slab (106) has a propagation mode with a third effective refractive index larger than each of the first effective refractive index and the second effective refractive index, allowing lateral leakage of light from the first optical waveguide (114) and the second optical waveguide (116) into the said propagation mode of the unmodified section (112) of the slab (106), so that an interferogram (200) may be produced in the unmodified section (112) of the slab (106) and be detectable by the optical detector system (108).

Patent Publication Number: EP3835738

Year filing: 2021

Year approval: 2022

Year publication: 2021

Status: Assigned

Technology domains: Measurement

Validated for IOF-key: Yes

Attributed to: Associatie Universiteit Gent