Optical wavefront phase-tilt measurement using Si-photonic waveguide grating couplers
Optical wavefront phase-tilt measurement using Si-photonic waveguide grating couplers
Silicon photonic wavefront phase-tilt sensors for wavefront monitoring using surface coupling grating arrays are demonstrated. The first design employs the intrinsic angle dependence of the grating coupling efficiency to determine local wavefront tilt, with a measured sensitivity of 7 dB/degree. A second design connects four gratings in an interferometric waveguide circuit to determine incident wavefront phase variation across the sensor area. In this device, one fringe spacing corresponds to approximately 2 degree wavefront tilt change. These sensor elements can sample a wavefront incident on the chip surface without the use of bulk optic elements, fiber arrays, or imaging arrays. Both sensor elements are less than 60 um across, and can be combined into larger arrays to monitor wavefront tilt and distortion across an image or pupil plane in adaptive optics systems for free space optical communications, astronomy and beam pointing applications.
Martin Vachon、Pavel Cheben、Daniele Melati、Dan-Xia Xu、Jens H. Schmid、Siegfried Janz、Shurui Wang、Yuri Grinberg
光电子技术通信电子对抗
Martin Vachon,Pavel Cheben,Daniele Melati,Dan-Xia Xu,Jens H. Schmid,Siegfried Janz,Shurui Wang,Yuri Grinberg.Optical wavefront phase-tilt measurement using Si-photonic waveguide grating couplers[EB/OL].(2023-09-20)[2025-08-23].https://arxiv.org/abs/2309.11424.点此复制
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