LIPPMANN-BASED WAVEGUIDE SPECTROMETER WITH PLANAR WAVEGUIDE CHIP

摘要

A waveguide spectrometer, comprising at least one planar waveguide chip (10) with at least one waveguide extending from an inlet face (F) to a reflective surface (105), in which an incident beam (11) is injectable, to achieve counter propagating optical signals inside the planar waveguide chip (10),wherein a multiplicity of sampling elements (1040) configured to out-couple light from the interfering guided optical signals and photo detectors is arranged in or on the planar waveguide chip (10), while sampling elements (1040) and photo detectors are electrically connected to an electronic read out system is created, showing enhanced throughput and spectral bandwidth. This is reached by beam expanding means located ahead the inlet face (F) of the planar waveguide chip (10), resulting in an expanded beam (110') and the single sampling elements (1040) are embedded in the planar waveguide chip (10) or located on a surface plane (1020) of the planar waveguide chip (10) forming a two dimensional grid (104), comprising a multiplicity of lines with sampling elements (1040) spaced apart from each other by an inline pitch (P) in each line, wherein directly neighbouring lines of sampling elements (1040) perpendicular to the propagation direction (z) have a well-defined offset along the propagation direction (z) to each other, defining a sampling interval (d) in propagation direction (z) of the waveguide chip (10).