公开(公告)号：US11099401B2

公开(公告)日：2021-08-24

申请号：US16443519

申请日：2019-06-17

Applicant: THE TRUSTEES OF DARTMOUTH COLLEGE

Inventor： Jonathan D. Olson ,  Keith D. Paulsen ,  David W. Roberts

IPC: G02B27/28 ,  G02B5/20 ,  H04N5/225 ,  H04N5/33 ,  G02B27/42

Abstract: A birefringent spectral demultiplexer for hyperspectral imaging includes N birefringent beamsplitting stages arranged along a light propagation path, to produce 2N mutually divergent output light beams. Each of the output light beams differs from every other one of the output light beams in polarization and/or spectral bandwidth. Each birefringent beamsplitting stage includes a retarder for modifying polarization of each light beam received by the birefringent beamsplitting stage, and a Wollaston prism for splitting each light beam into two orthogonally polarized and divergent light beams. The Wollaston prism has a beamsplitting interface arranged at an oblique angle to the light propagation path. The oblique angle of the beamsplitting interface of each Wollaston prism of the series, except for the first one, is smaller than the oblique angle of the beamsplitting interface of each preceding Wollaston prism. The demultiplexer may be configured to accept input light of any polarization.

公开(公告)号：US20190384069A1

公开(公告)日：2019-12-19

申请号：US16443519

申请日：2019-06-17

Applicant: THE TRUSTEES OF DARTMOUTH COLLEGE

Inventor： Jonathan D. Olson ,  Keith D. Paulsen ,  David W. Roberts

IPC: G02B27/28 ,  G02B5/20 ,  H04N5/33 ,  H04N5/225

Abstract: A birefringent spectral demultiplexer for hyperspectral imaging includes N birefringent beamsplitting stages arranged along a light propagation path, to produce 2N mutually divergent output light beams. Each of the output light beams differs from every other one of the output light beams in polarization and/or spectral bandwidth. Each birefringent beamsplitting stage includes a retarder for modifying polarization of each light beam received by the birefringent beamsplitting stage, and a Wollaston prism for splitting each light beam into two orthogonally polarized and divergent light beams. The Wollaston prism has a beamsplitting interface arranged at an oblique angle to the light propagation path. The oblique angle of the beamsplitting interface of each Wollaston prism of the series, except for the first one, is smaller than the oblique angle of the beamsplitting interface of each preceding Wollaston prism. The demultiplexer may be configured to accept input light of any polarization.