公开(公告)号：US20240063598A1

公开(公告)日：2024-02-22

申请号：US17891009

申请日：2022-08-18

Applicant: Raytheon Company

Inventor： Fabio Di Teodoro ,  David A. Rockwell

IPC: H01S3/067 ,  H01S3/094 ,  H01S3/10 ,  H01S3/16 ,  H01S3/30

CPC classification number: H01S3/06716 ,  H01S3/094007 ,  H01S3/10023 ,  H01S3/10084 ,  H01S3/1616 ,  H01S3/302

Abstract: A high-power Raman fiber laser includes: a seed laser; a plurality of pump lasers, each including a cladding and comprising of thulium-doped fiber laser (TDFL) and configured to operate in a 1935-2020 nm spectral window; a pump/seed combiner to combine outputs of the pump lasers and output of the seed laser and having a tapered portion including a cladding; and a Raman fiber amplifier having a core and a cladding surrounding the core, the seed laser is launched into the core, and pump laser output beams are launched into the cladding, to amplify the seed laser to produce an amplified output signal, and a brightness of the cladding of the Raman fiber amplifier is matched to a combined brightness of the plurality of pump lasers.

公开(公告)号：US20220407293A1

公开(公告)日：2022-12-22

申请号：US17304234

申请日：2021-06-16

Applicant: Raytheon Company

Inventor： David A. Rockwell ,  Fabio Di Teodoro ,  Marco A. Avila ,  Douglas W. Wolfe

IPC: H01S5/40 ,  G02B27/30 ,  H01S5/00

Abstract: A system includes multiple laser diode modules that are spatially separated and configured to generate multiple optical beams that propagate at angles relative to each other. The system also includes an optical element having at least one entrance surface and at least one exit surface. The optical element is configured to receive the optical beams at the at least one entrance surface and output each optical beam through the at least one exit surface such that the output optical beams are closely spaced, substantially the same size, and substantially parallel to each other at a common distance downstream from the optical element, and the optical beams all share a common downstream image plane.

公开(公告)号：US20210313758A1

公开(公告)日：2021-10-07

申请号：US16837599

申请日：2020-04-01

Applicant: Raytheon Company

Inventor： David A. Rockwell

IPC: H01S3/30 ,  H01S3/0941 ,  H01S3/094

Abstract: A system includes a seed laser configured to generate a seed beam and multiple arrays of semiconductor diode lasers configured to generate multiple pump beams. The system also includes a Raman amplifier having a core, a first cladding around the core, and at least a second cladding around the first cladding. The core is configured to amplify the seed beam based on optical pump power provided by the pump beams. Each of the core, the first cladding, and the second cladding includes fused silica, and at least the core and the first cladding are doped. The core has a numerical aperture of approximately 0.06 or less and a diameter of approximately 20 μm to approximately 25 μm. The first cladding has a numerical aperture of approximately 0.17 or less and a diameter of approximately 35 μm to approximately 45 μm.

公开(公告)号：US10944234B2

公开(公告)日：2021-03-09

申请号：US16206651

申请日：2018-11-30

Applicant: Raytheon Company

Inventor： Vladimir V. Shkunov ,  David A. Rockwell

IPC: H01S3/067 ,  H01S3/08 ,  G02B6/028 ,  H01S3/102

Abstract: An apparatus includes an optical fiber configured to transport an optical signal. A cross-section of the optical fiber has a longer slow-axis dimension and a shorter fast-axis dimension. The optical fiber includes a core configured to receive and amplify the optical signal, end features optically coupled to the core at opposite ends of the core, and a cladding surrounding the core and end features. The core has a height in the slow-axis dimension and a width in the fast-axis dimension. Each end feature has a height in the slow-axis dimension and a width in the fast-axis dimension. The core has a lower bend loss than the end features. The optical fiber is configured to confine optical power of a fundamental mode in the core and allow optical power of higher-order mode(s) to leak from the core into the end features. Each end feature's height is less than the core's width.

公开(公告)号：US10739542B2

公开(公告)日：2020-08-11

申请号：US15602519

申请日：2017-05-23

Applicant: Raytheon Company

Inventor： Ray E. McVey ,  David A. Rockwell

IPC: G02B6/44

Abstract: In various embodiments, an optical fiber module including an optical fiber having a first end, a second end, and a twisted portion between the first and second ends to enable the optical fiber to provide two orthogonal transverse bending degrees of freedom. The twisted portion induces an optical distortion. The module further includes a distortion compensation arrangement that is configured to at least partially compensate for the optical distortion and a housing that is configured to house at least a portion of the optical fiber including the twisted portion.

公开(公告)号：US20150117473A1

公开(公告)日：2015-04-30

申请号：US14067751

申请日：2013-10-30

Applicant: Raytheon Company

Inventor： David A. Rockwell ,  Vladimir V. Shkunov

IPC: H01S3/30 ,  G02B6/036

CPC classification number: H01S3/302 ,  G02B6/2821 ,  H01S3/042 ,  H01S3/06704 ,  H01S3/0672 ,  H01S3/06729 ,  H01S3/06733 ,  H01S3/06754 ,  H01S3/094007 ,  H01S3/09408 ,  H01S3/1695

Abstract: According to an embodiment of the disclosure, a system for producing a higher power laser beam is provided. The system includes an optical fiber having a length. The optical fiber is configured to receive inputs from multiple laser pumps and an input from a Stokes seed laser pump. The optical fiber has a core that is doped. The core, when viewed from a cross-section of the optical fiber, has a higher concentration of doping at a location near an axis of the optical fiber than a location further from the axis of the optical fiber. The optical fiber is also configured to convert pump power to Stokes power along the length of the optical fiber when subjected to a Stimulated Raman Scattering (SRS) process.

Abstract translation: 根据本公开的实施例，提供了一种用于产生较高功率的激光束的系统。 该系统包括具有长度的光纤。 光纤被配置为接收来自多个激光泵的输入和来自斯托克斯种子激光泵的输入。 光纤具有掺杂的芯。 当从光纤的横截面观察时，该芯在比光纤的轴线更靠近光纤的轴的位置处具有较高的掺杂浓度。 光纤还被配置为当受到受激拉曼散射（SRS）处理时，沿着光纤的长度将泵浦功率转换成斯托克斯功率。

公开(公告)号：US11658455B2

公开(公告)日：2023-05-23

申请号：US16837599

申请日：2020-04-01

Applicant: Raytheon Company

Inventor： David A. Rockwell

IPC: H01S3/30 ,  H01S3/094 ,  H01S3/0941

CPC classification number: H01S3/302 ,  H01S3/0941 ,  H01S3/094003

Abstract: A system includes a seed laser configured to generate a seed beam and multiple arrays of semiconductor diode lasers configured to generate multiple pump beams. The system also includes a Raman amplifier having a core, a first cladding around the core, and at least a second cladding around the first cladding. The core is configured to amplify the seed beam based on optical pump power provided by the pump beams. Each of the core, the first cladding, and the second cladding includes fused silica, and at least the core and the first cladding are doped. The core has a numerical aperture of approximately 0.06 or less and a diameter of approximately 20 μm to approximately 25 μm. The first cladding has a numerical aperture of approximately 0.17 or less and a diameter of approximately 35 μm to approximately 45 μm.

公开(公告)号：US11387620B2

公开(公告)日：2022-07-12

申请号：US16951860

申请日：2020-11-18

Applicant: Raytheon Company

Inventor： David A. Rockwell

IPC: H01S3/30 ,  H01S3/08 ,  H01S3/094 ,  H01S3/07

Abstract: An apparatus includes at least one Raman medium configured to receive a pump beam and shift at least a portion of the pump beam into a Stokes-shifted output beam. The apparatus also includes a first lens configured to receive and focus the pump beam into the at least one Raman medium. The apparatus further includes first and second retro-lens assemblies, each including at least one prism configured to reflect beams from the at least one Raman medium back into the at least one Raman medium and multiple second lenses configured to control optical propagation of the beams entering and exiting the at least one Raman medium. Multiple pairs of lenses form multiple confocal arrangements of lenses. The pairs of lenses include the first lens and the second lenses of the retro-lens assemblies. The at least one Raman medium is optically positioned between the lenses in the confocal arrangements of lenses.

公开(公告)号：US11280973B2

公开(公告)日：2022-03-22

申请号：US16889392

申请日：2020-06-01

Applicant: Raytheon Company

Inventor： David A. Rockwell ,  Friedrich P. Strohkendl ,  Ray McVey

IPC: G02B6/38 ,  G02B6/44

Abstract: An apparatus includes a base having walls that define a track. The track has input and output ends and defines a coiled path that spirals inward from the input end, reaches an inflection point where a direction of curvature is reversed, and spirals outward towards the output end. The track is configured to receive and maintain a majority of an optical fiber in an at least substantially planar coiled arrangement. The apparatus also includes a first transition arm positioned at the input end and a second transition arm positioned at the output end. Each transition arm is configured to be mechanically coupled to the base and includes a groove configured to receive and maintain a portion of the optical fiber in an at least substantially straight orientation. The walls and transition arms are configured to maintain thermal contact with the optical fiber along its entire length.

公开(公告)号：US20190109430A1

公开(公告)日：2019-04-11

申请号：US16206651

申请日：2018-11-30

Applicant: Raytheon Company

Inventor： Vladimir V. Shkunov ,  David A. Rockwell

IPC: H01S3/067

Abstract: An apparatus includes an optical fiber configured to transport an optical signal. A cross-section of the optical fiber has a longer slow-axis dimension and a shorter fast-axis dimension. The optical fiber includes a core configured to receive and amplify the optical signal, end features optically coupled to the core at opposite ends of the core, and a cladding surrounding the core and end features. The core has a height in the slow-axis dimension and a width in the fast-axis dimension. Each end feature has a height in the slow-axis dimension and a width in the fast-axis dimension. The core has a lower bend loss than the end features. The optical fiber is configured to confine optical power of a fundamental mode in the core and allow optical power of higher-order mode(s) to leak from the core into the end features. Each end feature's height is less than the core's width.