公开(公告)号：US11435229B2

公开(公告)日：2022-09-06

申请号：US16662886

申请日：2019-10-24

申请人： SA Photonics, Inc.

发明人： James F. Coward ,  David Alan Pechner ,  Gregory Mitchell ,  Ji Li

IPC分类号： G01J3/28 ,  G01J3/10 ,  G06T7/521

摘要： Shortwave infrared (SWIR) hyperspectral imaging (HSI) systems comprise a supercontinuum laser source configured to illuminate objects and a receiver comprising a spectrometer configured to receive light reflected from the objects. In some cases, hyperspectral images can be created by raster scanning of the source/receiver across a scene. The supercontinuum laser source provides active illumination to allow collection of hyperspectral imagery during day (including overcast conditions) and night. Additionally, the hyperspectral imaging systems can use range-gated imaging.

公开(公告)号：US10584999B2

公开(公告)日：2020-03-10

申请号：US15939049

申请日：2018-03-28

申请人： SA Photonics, Inc.

发明人： Vladimir Protopopov ,  Greg G. Mitchell ,  James F. Coward

IPC分类号： G01J3/02 ,  G02F1/35 ,  G08B29/28

摘要： Embodiments relate to a high power supercontinuum (SC) fiber optical source. The SC fiber optical source includes a prebroadening optical fiber that broadens the spectrum of a lower power intermediate optical signal before final amplification. The spectrum broadening creates spectral components which facilitate further spectrum broadening of amplified signal in final nonlinear stage, allowing to achive flatter and wider spectrum, and reduces nonlinear Stimulated Brillouin Scattering (SBS) that could damage SC fiber optical source components or limit the output power of the SC fiber optical source signal, thus enabling higher output power. After amplification in booster, passing at least part of broadened spectrum, the optical signal spectrum is further broadened by injecting the optical signal into a nonlinear stage to create a SC optical signal.

公开(公告)号：US11652548B1

公开(公告)日：2023-05-16

申请号：US17485037

申请日：2021-09-24

申请人： SA Photonics, Inc.

发明人： Greg G. Mitchell ,  James F. Coward

IPC分类号： H04B10/112 ,  H04J14/02 ,  G02B27/09 ,  G02B5/04 ,  G02B23/02

CPC分类号： H04B10/1123 ,  G02B5/04 ,  G02B23/02 ,  G02B27/0972 ,  H04J14/02

摘要： Embodiments relate to a free space optical (FSO) terminal that transmits and receives (e.g., data-encoded) optical beams. The FSO terminal includes a fore optic (e.g., telescope) and a chromatic Risley prism pair. A receive (Rx) optical beam is received through the fore optic, and a transmit (Tx) optical beam is transmitted through the fore optic. The chromatic Risley prism pair is positioned along the optical paths of both the Rx and Tx optical beams. Since the Rx and Tx optical beams have different wavelengths and the chromatic Risley prism pair has a wavelength dependence, the chromatic Risley prism pair creates an angular separation between the Rx and Tx optical beams. A controller controls the Risley prism pair (and possibly also the wavelength of the Tx optical beam) to achieve a desired angular separation between the Rx and Tx optical beams in free space.

公开(公告)号：US20200264047A1

公开(公告)日：2020-08-20

申请号：US16662886

申请日：2019-10-24

申请人： SA Photonics, Inc.

发明人： James F. Coward ,  David Alan Pechner ,  Gregory Mitchell ,  Ji Li

IPC分类号： G01J3/10 ,  G01J3/28 ,  G06T7/521

摘要： Shortwave infrared (SWIR) hyperspectral imaging (HSI) systems comprise a supercontinuum laser source configured to illuminate objects and a receiver comprising a spectrometer configured to receive light reflected from the objects. In some cases, hyperspectral images can be created by raster scanning of the source/receiver across a scene. The supercontinuum laser source provides active illumination to allow collection of hyperspectral imagery during day (including overcast conditions) and night.

公开(公告)号：US11515941B2

公开(公告)日：2022-11-29

申请号：US17394287

申请日：2021-08-04

申请人： SA Photonics, Inc.

发明人： James F. Coward ,  Greg G. Mitchell

IPC分类号： H04B10/112 ,  H04B10/61 ,  H04B10/114 ,  H04B10/25 ,  H04B10/29 ,  H04B10/50 ,  H04B10/66 ,  G02B6/32

摘要： Embodiments relate to a local free space optical (FSO) terminal that transmits and receives optical beams. The FSO terminal includes a fore optic and a dispersive optical component. A receive (Rx) optical beam from a remote FSO terminal is received and focused by the fore optic to a Rx spot at a focal plane of the fore optic. A transmit (Tx) optical beam with a different wavelength forms a Tx spot at the focal plane and is collimated and projected by the fore optic to the remote FSO terminal. The dispersive optical component is positioned along optical paths of both the Rx beam and the Tx beam. Among other advantages, a wavelength dependence of the dispersive optical component laterally separates the Rx spot and the Tx spot at the focal plane.

公开(公告)号：US11387899B1

公开(公告)日：2022-07-12

申请号：US17484314

申请日：2021-09-24

申请人： SA Photonics, Inc.

发明人： James F. Coward ,  William C. Dickson

IPC分类号： H04B10/00 ,  H04B10/112 ,  H04N7/22 ,  H04J14/00

摘要： A local free space optical (FSO) terminal senses an external environment that includes at least two beacons transmitted from a remote FSO terminal. The local terminal is configured to sense the beacons at a frame rate. Each beacon comprises a pulse train with pulses that are transmitted at a pulse rate. The pulse trains are temporally offset relative to each other so that pulses from at least one of the pulse trains do not fall across frame boundaries during sensing, regardless of a temporal location of the frame boundaries. In addition to detecting the at least two beacons, the local terminal is configured to identity the beacon that contains pulses that do not fall across the frame boundaries, and adjust its orientation based on the identified beacon.

公开(公告)号：US20200041870A1

公开(公告)日：2020-02-06

申请号：US15939049

申请日：2018-03-28

申请人： SA Photonics, Inc.

发明人： Vladimir Protopopov ,  Greg G. Mitchell ,  James F. Coward

IPC分类号： G02F1/365 ,  H01S3/067 ,  H01S3/16

摘要： Embodiments relate to a high power supercontinuum (SC) fiber optical source. The SC fiber optical source includes a prebroadening optical fiber that broadens the spectrum of a lower power intermediate optical signal before final amplification. The spectrum broadening creates spectral components which facilitate further spectrum broadening of amplified signal in final nonlinear stage, allowing to achieve flatter and wider spectrum, and reduces nonlinear Stimulated Brillouin Scattering (SBS) that could damage SC fiber optical source components or limit the output power of the SC fiber optical source signal, thus enabling higher output power. After amplification in booster, passing at least part of broadened spectrum, the optical signal spectrum is further broadened by injecting the optical signal into a nonlinear stage to create a SC optical signal.