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    Utilization of time and spatial division multiplexing in high power ultrafast optical amplifiers
    1.
    发明授权
    Utilization of time and spatial division multiplexing in high power ultrafast optical amplifiers 有权

    公开(公告)号：US11121519B2

    公开(公告)日：2021-09-14

    申请号：US16218065

    申请日：2018-12-12

    Applicant: IMRA America, Inc.

    Inventor： Kevin F. Lee ,  Martin E. Fermann

    IPC: H01S3/067 ,  H01S3/00 ,  H01S3/23 ,  H01S3/10 ,  H01S3/13 ,  H01S3/094 ,  H01S3/08

    Abstract: In an example amplifier system, an input pulse train is passed through an optical stage that splits each pulse into two or more pulses. These divided pulses are then injected into at least two amplifiers for amplification. The amplified pulses are subsequently passed back through the same optical stage in order to combine the pulses back into one high energy pulse. The amplifier system can use time division multiplexing (TDM) and/or spatial division multiplexing (SDM) to produce, e.g., four pulses in conjunction with two amplifiers and propagation through two optical beam splitters, which are coherently combined into a single output pulse after amplification. The amplifiers can comprise fiber amplifiers or bulk amplifiers.

    COMB RESOLVED FOURIER TRANSFORM SPECTROSCOPY
    2.
    发明申请
    COMB RESOLVED FOURIER TRANSFORM SPECTROSCOPY 审中-公开
    COMB决议FOURIER变换光谱

    公开(公告)号：US20160153835A1

    公开(公告)日：2016-06-02

    申请号：US14933334

    申请日：2015-11-05

    Applicant: IMRA America, Inc.

    Inventor： Kevin F. Lee ,  Martin E. Fermann

    IPC: G01J3/453 ,  G01J3/10

    CPC classification number: G01J3/453 ,  G01J3/108 ,  G01N21/031 ,  G01N21/1702 ,  G01N21/3504 ,  G01N21/39 ,  G01N29/2425 ,  G01N29/46 ,  G01N2021/1704 ,  G01N2021/3595 ,  G01N2021/391

    Abstract: Systems and methods for high resolution and high sensitivity spectroscopy are disclosed. High resolution can be obtained in conjunction with comb sources via comb resolved spectroscopy. For example, Fourier transform spectroscopy with a scan range larger than a cavity round trip time of the comb sources can be used to obtain comb resolution, where it may be useful to match the comb lines of the source with the sampling points of the Fourier transform spectrometer. High sensitivity can be obtained using multiple passes through a gas cell, cavity enhanced spectroscopy, cavity ring-down spectroscopy, or photo-acoustic spectroscopy. Fiber or solid-state lasers as well as semiconductor or quantum cascade based lasers can be used as comb injection sources. These sources can also be combined with nonlinear frequency broadening techniques via supercontinuum generation, DFG, OPOs or OPAs.

    Abstract translation: 公开了用于高分辨率和高灵敏度光谱的系统和方法。 通过梳状分辨光谱可以与梳状光源一起获得高分辨率。 例如，可以使用具有大于梳状源的腔体往返时间的扫描范围的傅立叶变换光谱来获得梳状分辨率，其中将源的梳状线与傅里叶变换的采样点相匹配可能是有用的 光谱仪 可以使用多次通过气室，腔增强光谱，空腔衰减光谱或光声谱来获得高灵敏度。 可以使用光纤或固态激光器以及基于半导体或量子级联的激光器作为梳状注入源。 这些源还可以通过超连续谱生成，DFG，OPO或OPA与非线性频率展宽技术相结合。

    Stable difference frequency generation using fiber lasers
    3.
    发明授权
    Stable difference frequency generation using fiber lasers 有权

    公开(公告)号：US10690994B2

    公开(公告)日：2020-06-23

    申请号：US16191127

    申请日：2018-11-14

    Applicant: IMRA America, Inc.

    Inventor： Kevin F. Lee ,  Martin E. Fermann

    IPC: G02F1/35 ,  G02F1/01 ,  G02F1/355 ,  G02F1/365 ,  H01S3/067 ,  H01S3/16 ,  H01S3/00 ,  G02B6/00 ,  H01S3/23 ,  H01S3/13 ,  H01S3/11 ,  H01S3/30

    Abstract: Systems and methods for stabilizing mid-infrared light generated by difference frequency mixing may include a mode locked Er fiber laser that generates pulses, which are split into a pump arm and a wavelength shifting, signal arm. Pump arm pulses are amplified in Er doped fiber. Shifting arm pulses are amplified in Er doped fiber and shifted to longer wavelengths in Raman-shifting fiber or highly nonlinear fiber, where they may be further amplified by Tm doped fiber, and then optionally further wavelength shifted. Pulses from the two arms can be combined in a nonlinear crystal such as orientation-patterned gallium phosphide, producing a mid-infrared difference frequency, as well as nonlinear combinations (e.g., sum frequency) having near infrared and visible wavelengths. Optical power stabilization can be achieved using two wavelength ranges with spectral filtering and multiple detectors acquiring information for feedback control. Controlled fiber bending can be used to stabilize optical power.

    Precision light source
    5.
    发明授权
    Precision light source 有权

    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%.

    PRECISION LIGHT SOURCE
    6.
    发明申请
    PRECISION LIGHT SOURCE 有权

    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%.

    STABLE DIFFERENCE FREQUENCY GENERATION USING FIBER LASERS
    7.
    发明申请
    STABLE DIFFERENCE FREQUENCY GENERATION USING FIBER LASERS 审中-公开

    公开(公告)号：US20190079368A1

    公开(公告)日：2019-03-14

    申请号：US16191127

    申请日：2018-11-14

    Applicant: IMRA America, Inc.

    Inventor： Kevin F. Lee ,  Martin E. Fermann

    IPC: G02F1/35 ,  H01S3/00 ,  G02F1/355 ,  H01S3/067 ,  G02F1/365 ,  H01S3/13 ,  H01S3/11 ,  H01S3/16 ,  H01S3/30

    Abstract: Systems and methods for stabilizing mid-infrared light generated by difference frequency mixing may include a mode locked Er fiber laser that generates pulses, which are split into a pump arm and a wavelength shifting, signal arm. Pump arm pulses are amplified in Er doped fiber. Shifting arm pulses are amplified in Er doped fiber and shifted to longer wavelengths in Raman-shifting fiber or highly nonlinear fiber, where they may be further amplified by Tm doped fiber, and then optionally further wavelength shifted. Pulses from the two arms can be combined in a nonlinear crystal such as orientation-patterned gallium phosphide, producing a mid-infrared difference frequency, as well as nonlinear combinations (e.g., sum frequency) having near infrared and visible wavelengths. Optical power stabilization can be achieved using two wavelength ranges with spectral filtering and multiple detectors acquiring information for feedback control. Controlled fiber bending can be used to stabilize optical power.

    TRACE GAS DETECTION SYSTEM
    9.
    发明申请
    TRACE GAS DETECTION SYSTEM 审中-公开
    跟踪气体检测系统

    公开(公告)号：US20140264031A1

    公开(公告)日：2014-09-18

    申请号：US14178985

    申请日：2014-02-12

    Applicant: IMRA AMERICA, INC.

    Inventor： Martin E. FERMANN ,  Kevin F. Lee ,  Andrew A. Mills

    IPC: G01J3/42 ,  A61B5/00 ,  G01J3/10

    CPC classification number: G01J3/42 ,  A61B5/082 ,  A61B5/097 ,  G01J3/453

    Abstract: The present invention relates to a trace gas detection system. At least one embodiment includes a frequency spectrum comprising a 1st comb and an enhancement cavity characterized by having a 2nd comb of spectral resonances. The enhancement cavity contains a sample gas for spectroscopic measurement. A dither mechanism is configured to modulate the relative spectral position between the combs at a dither frequency, fd. The dither mechanism, in conjunction with a feedback mechanism, stabilizes the location of said 1st comb lines with respect to the resonances of said 2nd comb over a time scale much greater than a dither period, Td=1/fd. A time-averaged output from the enhancement cavity is provided to a spectroscopic measurement tool, for example a Fourier transform spectrometer. The system is capable of detecting volatile organic compounds, endogenous compounds, and may be configured for cancer detection.

    Abstract translation: 痕量气体检测系统技术领域本发明涉及痕量气体检测系统。 至少一个实施例包括包括第一梳状物和增强腔体的频谱，其特征在于具有第二梳状光谱谐振。 增强腔包含用于光谱测量的样品气体。 抖动机构被配置为以抖动频率fd调制梳之间的相对光谱位置。 抖动机构结合反馈机制，稳定了所述第一梳状线相对于所述第二梳状体的谐振在比抖动周期Td = 1 / fd大得多的时间尺度上的位置。 来自增强腔的时间平均输出被提供给光谱测量工具，例如傅里叶变换光谱仪。 该系统能够检测挥发性有机化合物，内源性化合物，并可配置用于癌症检测。

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