公开(公告)号：US5633885A

公开(公告)日：1997-05-27

申请号：US312912

申请日：1994-09-29

Applicant: Almantas Galvanauskas ,  Donald J. Harter

Inventor： Almantas Galvanauskas ,  Donald J. Harter

IPC: G02F1/35 ,  H01S3/00 ,  H01S5/00 ,  H01S5/042 ,  H01S5/0625 ,  H01S5/12 ,  H01S3/10

CPC classification number: H01S5/0625 ,  H01S3/0057 ,  H01S5/0057 ,  H01S5/0428 ,  H01S5/06256 ,  H01S5/1212

Abstract: A method of, and apparatus for controlling and compensating for high order frequency chirp in a fast tuned laser. Optical means in the form of chirped Bragg gratings, preferrably in-fiber gratings, are used to compensate for one or more orders of the frequency chirp. Alternatively, or in combination with the optical compensation, an electrical compensation scheme employs integrators in one or more parallel compensation channels to create a composite compensation signal to compensate for specific order nonlinearities. The present invention allows for the generation of shorter bandwidth-limited optical pulses with spectra containing the complete tuning range of the tunable laser.

Abstract translation: 一种用于控制和补偿快速调谐激光器中高阶啁啾的方法和装置。 啁啾布拉格光栅形式的光学装置，优选的光纤内光栅用于补偿一个或多个频率啁啾。 或者，或者与光学补偿组合，电补偿方案在一个或多个并行补偿通道中使用积分器来产生复合补偿信号以补偿特定阶非线性。 本发明允许产生具有包含可调激光器的完整调谐范围的光谱的较短带宽限制的光脉冲。

公开(公告)号：US5313262A

公开(公告)日：1994-05-17

申请号：US953250

申请日：1992-09-30

Applicant: Carl D. Leonard

Inventor： Carl D. Leonard

IPC: B60R21/00 ,  B60T1/16 ,  B60T7/22 ,  B60W30/00 ,  G01C3/06 ,  G01S7/481 ,  G01S17/02 ,  G01S17/93 ,  G05D1/02 ,  G08G1/00 ,  G08G1/16 ,  G01C3/08 ,  B60T7/16 ,  G01B11/26 ,  G01C3/00

CPC classification number: G01S17/936 ,  B60T1/16 ,  B60T7/22 ,  G01S17/026 ,  G01S7/4814

Abstract: In exemplary embodiments, a diffraction grating is placed in the beam path of the generated light source. The grating expands the beam's field of view by distributing the transmitted radiation into plural sub-fields. Sub-fields associated with distant objects are set to a greater intensity to ensure reflection of the sub-fields back to the receiver. Sub-fields directed to closer objects have a lesser intensity to avoid detection of false objects.

Abstract translation: 在示例性实施例中，衍射光栅被放置在所生成的光源的光束路径中。 光栅通过将发射的辐射分布到多个子场中来扩展光束的视场。 将与远处物体相关联的子场设置为更大的强度，以确保子场反射回接收器。 指向更近物体的子场具有较小的强度，以避免检测假物体。

公开(公告)号：US11881681B2

公开(公告)日：2024-01-23

申请号：US17113409

申请日：2020-12-07

Applicant: IMRA America, Inc.

Inventor： Martin E. Fermann ,  Kevin F. Lee

IPC: H01S3/00 ,  H01S5/0625 ,  H01S5/02251 ,  H01S5/065 ,  H01S3/23

CPC classification number: H01S5/06253 ,  H01S3/0057 ,  H01S3/0092 ,  H01S5/02251 ,  H01S5/0657 ,  H01S3/2316

Abstract: A pulse transformer for modifying the amplitude and phase of short optical pulses includes a pulse source and an adaptively controlled stretcher or compressor including at least one fiber Bragg grating (FBG) configured to receive pulses from the pulse source and having a first second-order dispersion parameter (D21). The pulse transformer further includes at least one optical amplifier configured to receive pulses from the FBG and a compressor configured to receive pulses from the at least one optical amplifier. The compressor has a second second-order dispersion parameter (−D22), an absolute value of the first second-order dispersion parameter (|D21|) and an absolute value of the second second-order dispersion parameter (|−D22|) that are substantially equal to one another to within 10%.

公开(公告)号：US20230333012A1

公开(公告)日：2023-10-19

申请号：US18193954

申请日：2023-03-31

Applicant: IMRA America, Inc.

Inventor： Antoine Jean Gilbert Rolland ,  James Greenberg ,  Brendan Heffernan ,  Rubab Amin

IPC: G01N21/3581 ,  G01N21/3504

CPC classification number: G01N21/3581 ,  G01N21/3504 ,  G01N2201/0612

Abstract: A photonic millimeter-wave oscillator is based on a heterodyne beatnote of two continuous wave lasers and is configured to provide a narrow linewidth output when the frequency difference is disciplined with rotational spectroscopy of molecules using frequency modulation spectroscopy.

公开(公告)号：US11409185B2

公开(公告)日：2022-08-09

申请号：US17225012

申请日：2021-04-07

Applicant: IMRA America, Inc.

Inventor： Naoya Kuse ,  Martin E. Fermann ,  Tomohiro Tetsumoto ,  Antoine Jean Gilbert Rolland

IPC: G02F1/35 ,  G01S7/481 ,  G04F5/14

Abstract: Systems and methods for precision control of microresonator (MR) based frequency combs can implement optimized MR actuators or MR modulators to control long-term locking of carrier envelope offset frequency, repetition rate, or resonance offset frequency of the MR. MR modulators can also be used for amplitude noise control. MR parameters can be locked to external reference frequencies such as a continuous wave laser or a microwave reference. MR parameters can be selected to reduce cross talk between the MR parameters, facilitating long-term locking. The MR can be locked to an external two wavelength delayed self-heterodyne interferometer for low noise microwave generation. An MR-based frequency comb can be tuned by a substantial fraction or more of the free spectral range (FSR) via a feedback control system. Scanning MR frequency combs can be applied to dead-zone free spectroscopy, multi-wavelength LIDAR, high precision optical clocks, or low phase noise microwave sources.

公开(公告)号：US20220221583A1

公开(公告)日：2022-07-14

申请号：US17224938

申请日：2021-04-07

Applicant: IMRA AMERICA, INC.

Inventor： Antoine Jean Gilbert Rolland ,  Eng Hiang Mark Yeo ,  Tomohiro Tetsumoto

IPC: G01S17/34 ,  G01S7/493 ,  G01S7/4912 ,  H04B10/64 ,  H04B10/40 ,  H04B10/2581 ,  H04B10/27

Abstract: A tunable millimeter-wave signal oscillator includes two phase coherent optical oscillators, a fiber-ring cavity configured to generate two Stokes waves, and a photosensitive element converting the frequency difference of two optical oscillator into a millimeter-wave radiation. A chip-scale form factor millimeter-wave oscillator includes two continuous wave lasers, a plurality of micro-optical-resonators, an optical frequency division mechanism, two optical tunable bandpass filters, and a photosensitive element converting the pulse train of a frequency comb into a millimeter-wave radiation. A millimeter-wave phase noise analyzer includes an optical interferometer, two photosensitive elements, and a fundamental millimeter-wave frequency mixer. A millimeter-wave frequency counter includes an electro-optic optical frequency comb generator, a microwave voltage controlled oscillator, and an optoelectronic phase locked loop. A millimeter-wave electrical spectrum analyzer includes a millimeter-wave phase noise analyzer, a millimeter-wave amplitude detector, a millimeter-wave frequency counter, and a data processing unit.

公开(公告)号：US20220178919A1

公开(公告)日：2022-06-09

申请号：US17037162

申请日：2020-09-29

Applicant: IMRA America, Inc.

Inventor： Bing Liu ,  Matthew L. Elani ,  Alison R. Garrett

IPC: G01N33/543 ,  G01N33/76 ,  G01N33/68 ,  G01N27/74

Abstract: A method, system, and apparatus for the rapid detection of analyte(s) of interest are disclosed which can provide high sensitivity quantification of the analyte concentration in a lateral follow assay. The method includes labeling detection molecules with magnetic particles and immobilizing the magnetic particles on a nitrocellulose membrane upon specific biochemical recognition and binding. An external magnetic field is applied to the magnetic particles to induce magnetic induction, and a magnetoresistance sensor is positioned close to the membrane and magnetic particles. A periodic signal in the sensor is produced when a mechanical oscillatory movement is provided to the membrane relative to the sensor (or vice versa). Triggered time averaging of signals in synchronization with the oscillatory motion enables noise reduction of less than 30 dB and significant improvement of assay sensitivity. An x-y motion program for scanning the test line and control line on the membrane can produce magnetic 2D mapping of the lines, further differentiating the bound particles at the lines from unbound particles in the background, rendering a more accurate assay.

公开(公告)号：US20210194210A1

公开(公告)日：2021-06-24

申请号：US17113409

申请日：2020-12-07

Applicant: IMRA America, Inc.

Inventor： Martin E. Fermann ,  Kevin F. Lee

IPC: H01S5/0625 ,  H01S5/065 ,  H01S5/02251

Abstract: A pulse transformer for modifying the amplitude and phase of short optical pulses includes a pulse source and an adaptively controlled stretcher or compressor including at least one fiber Bragg grating (FBG) configured to receive pulses from the pulse source and having a first second-order dispersion parameter (D21). The pulse transformer further includes at least one optical amplifier configured to receive pulses from the FBG and a compressor configured to receive pulses from the at least one optical amplifier. The compressor has a second second-order dispersion parameter (−D22), an absolute value of the first second-order dispersion parameter (|D21|) and an absolute value of the second second-order dispersion parameter (|−D22|) that are substantially equal to one another to within 10%.

公开(公告)号：US11025027B2

公开(公告)日：2021-06-01

申请号：US16576371

申请日：2019-09-19

Applicant: IMRA America, Inc.

Inventor： Antoine Jean Gilbert Rolland ,  Marco Cassinerio ,  Jie Jiang ,  Martin E. Fermann

IPC: H01S3/13 ,  H01S3/11 ,  H01S3/067 ,  H01S3/00

Abstract: Examples of compact control electronics for precision frequency combs are disclosed. Application of digital control architecture in conjunction with compact and configurable analog electronics provides precision control of phase locked loops with reduced or minimal latency, low residual phase noise, and/or high stability and accuracy, in a small form factor.

公开(公告)号：US10197727B2

公开(公告)日：2019-02-05

申请号：US15485025

申请日：2017-04-11

Applicant: IMRA America, Inc.

Inventor： Liang Dong ,  Donald J. Harter ,  William Wong

IPC: G02B6/032 ,  H01S3/00 ,  H01S3/067 ,  G02B6/02 ,  G02B6/14 ,  G02B6/024 ,  G02B6/32

Abstract: Holey fibers provide optical propagation. In various embodiments, a large core holey fiber comprises a cladding region formed by large holes arranged in few layers. The number of layers or rows of holes about the large core can be used to coarse tune the leakage losses of the fundamental and higher modes of a signal, thereby allowing the non-fundamental modes to be substantially eliminated by leakage over a given length of fiber. Fine tuning of leakage losses can be performed by adjusting the hole dimension and/or spacing to yield a desired operation with a desired leakage loss of the fundamental mode. Resulting holey fibers have a large hole dimension and spacing, and thus a large core, when compared to traditional fibers and conventional fibers that propagate a single mode. Other loss mechanisms, such as bend loss and modal spacing can be utilized for selected modes of operation of holey fibers.