公开(公告)号：US20190041267A1

公开(公告)日：2019-02-07

申请号：US16148794

申请日：2018-10-01

Applicant: Massachusetts Institute of Technology

Inventor： David Burghoff ,  Yang Yang ,  Qing Hu

IPC: G01J3/28 ,  G01J3/453 ,  G01J3/10 ,  G01J9/04 ,  G01J3/42

Abstract: According to one aspect, a multi-heterodyne system is disclosed, which comprises a first laser source for generating multi-mode radiation having a frequency spectrum characterized by a first plurality of phase coherent frequencies, and a second laser source for generating multi-mode radiation having a frequency spectrum characterized by a second plurality of phase coherent frequencies. The system further comprises at least one detector for detecting a combination of the multi-mode radiation generated by the first and second laser sources so as to provide a multi-heterodyne signal having a frequency spectrum characterized by a plurality of beat frequencies, each beat frequency corresponding to a pairwise difference in the first and second plurality of phase coherent frequencies. The system further comprises an analyzer for receiving said multi-heterodyne signal and configured to employ a predictive model of the multi-heterodyne signal to provide estimates of any of phase error and timing error associated with the beat frequencies.

公开(公告)号：US10656016B2

公开(公告)日：2020-05-19

申请号：US16148794

申请日：2018-10-01

Applicant: Massachusetts Institute of Technology

Inventor： David Burghoff ,  Yang Yang ,  Qing Hu

IPC: G01J3/28 ,  G01J3/42 ,  G01J3/453 ,  G01J9/04 ,  G01J3/10

Abstract: According to one aspect, a multi-heterodyne system is disclosed, which comprises a first laser source for generating multi-mode radiation having a frequency spectrum characterized by a first plurality of phase coherent frequencies, and a second laser source for generating multi-mode radiation having a frequency spectrum characterized by a second plurality of phase coherent frequencies. The system further comprises at least one detector for detecting a combination of the multi-mode radiation generated by the first and second laser sources so as to provide a multi-heterodyne signal having a frequency spectrum characterized by a plurality of beat frequencies, each beat frequency corresponding to a pairwise difference in the first and second plurality of phase coherent frequencies. The system further comprises an analyzer for receiving said multi-heterodyne signal and configured to employ a predictive model of the multi-heterodyne signal to provide estimates of any of phase error and timing error associated with the beat frequencies.

公开(公告)号：US20170138791A1

公开(公告)日：2017-05-18

申请号：US15259687

申请日：2016-09-08

Applicant: Massachusetts Institute of Technology

Inventor： David Burghoff ,  Yang Yang ,  Qing Hu

IPC: G01J3/28 ,  G01J3/10

CPC classification number: G01J3/28 ,  G01J3/10 ,  G01J3/108 ,  G01J3/2803 ,  G01J3/42 ,  G01J3/4531 ,  G01J9/04 ,  G01J2003/102 ,  G01J2003/284

Abstract: According to one aspect, a multi-heterodyne system is disclosed, which comprises a first laser source for generating multi-mode radiation having a frequency spectrum characterized by a first plurality of phase coherent frequencies, and a second laser source for generating multi-mode radiation having a frequency spectrum characterized by a second plurality of phase coherent frequencies. The system further comprises at least one detector for detecting a combination of the multi-mode radiation generated by the first and second laser sources so as to provide a multi-heterodyne signal having a frequency spectrum characterized by a plurality of beat frequencies, each beat frequency corresponding to a pairwise difference in the first and second plurality of phase coherent frequencies. The system further comprises an analyzer for receiving said multi-heterodyne signal and configured to employ a predictive model of the multi-heterodyne signal to provide estimates of any of phase error and timing error associated with the beat frequencies.

公开(公告)号：US09036674B2

公开(公告)日：2015-05-19

申请号：US14372135

申请日：2013-03-05

Applicant: Massachusetts Institute of Technology ,  LongWave Photonics LLC

Inventor： Qing Hu ,  Alan Wei Min Lee ,  Tsung-Yu Kao

IPC: H01S5/12 ,  H01S5/22 ,  H01S5/20 ,  H01S1/02 ,  H01S3/067

CPC classification number: H01S5/22 ,  H01S1/02 ,  H01S3/0675 ,  H01S5/12 ,  H01S5/1231 ,  H01S5/2045 ,  H01S5/2086

Abstract: A third-order distributed feedback laser has an active medium disposed on a substrate as a linear array of segments having a series of periodically spaced interstices therebetween and a first conductive layer disposed on a surface of the active medium on each of the segments and along a strip from each of the segments to a conductive electrical contact pad for application of current along a path including the active medium. Upon application of a current through the active medium, the active medium functions as an optical waveguide, and there is established an alternating electric field, at a THz frequency, both in the active medium and emerging from the interstices. Spacing of adjacent segments is approximately half of a wavelength of the THz frequency in free space or an odd integral multiple thereof, so that the linear array has a coherence length greater than the length of the linear array.

Abstract translation: 三阶分布反馈激光器具有设置在基板上的活性介质作为线段阵列，其具有在其间具有一系列周期性间隔的间隙的第一导电层，以及设置在每个段上的活性介质的表面上的第一导电层， 从每个段到条形导电电接触焊盘，用于沿着包括活性介质的路径施加电流。 在通过有源介质施加电流时，活性介质用作光波导，并且在活性介质中并且从空隙中出现时，建立了THz频率的交变电场。 相邻段的间隔大约是自由空间中的THz频率的波长的一半或其奇数整数倍，使得线性阵列的相干长度大于线性阵列的长度。

公开(公告)号：US20140008553A1

公开(公告)日：2014-01-09

申请号：US14021887

申请日：2013-09-09

Applicant: Massachusetts Institute of Technology

Inventor： Qing Hu

IPC: H01S3/10

CPC classification number: H01S3/1003 ,  H01S3/106 ,  H01S5/02252 ,  H01S5/0607 ,  H01S5/0655 ,  H01S5/1032 ,  H01S5/1237 ,  H01S5/14 ,  H01S5/22 ,  H01S5/3402 ,  H01S2301/18 ,  H01S2302/02

Abstract: The present invention provides frequency tunable solid-state radiation-generating devices, such as lasers and amplifiers, whose active medium has a size in at least one transverse dimension (e.g., its width) that is much smaller than the wavelength of radiation generated and/or amplified within the active medium. In such devices, a fraction of radiation travels as an evanescent propagating mode outside the active medium. It has been discovered that in such devices the radiation frequency can be tuned by the interaction of a tuning mechanism with the propagating evanescent mode.

Abstract translation: 本发明提供了频率可调固态辐射产生装置，例如激光器和放大器，其活性介质具有至少一个横向尺寸（例如，其宽度）的尺寸，该尺寸远小于产生的辐射的波长和/ 或在活性培养基内放大。 在这样的装置中，一部分辐射在活性介质外部作为消逝传播模式行进。 已经发现，在这种装置中，辐射频率可以通过调谐机构与传播的消逝模式的相互作用来调节。

公开(公告)号：US10126170B2

公开(公告)日：2018-11-13

申请号：US15259687

申请日：2016-09-08

Applicant: Massachusetts Institute of Technology

Inventor： David Burghoff ,  Yang Yang ,  Qing Hu

IPC: G01J3/28 ,  G01J3/10

Abstract: According to one aspect, a multi-heterodyne system is disclosed, which comprises a first laser source for generating multi-mode radiation having a frequency spectrum characterized by a first plurality of phase coherent frequencies, and a second laser source for generating multi-mode radiation having a frequency spectrum characterized by a second plurality of phase coherent frequencies. The system further comprises at least one detector for detecting a combination of the multi-mode radiation generated by the first and second laser sources so as to provide a multi-heterodyne signal having a frequency spectrum characterized by a plurality of beat frequencies, each beat frequency corresponding to a pairwise difference in the first and second plurality of phase coherent frequencies. The system further comprises an analyzer for receiving said multi-heterodyne signal and configured to employ a predictive model of the multi-heterodyne signal to provide estimates of any of phase error and timing error associated with the beat frequencies.