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    STABLE DIFFERENCE FREQUENCY GENERATION USING FIBER LASERS
    61.
    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.

    INTEGRATED PHOTONIC MICROWAVE TRANSCEIVER SYSTEM
    62.
    发明申请
    INTEGRATED PHOTONIC MICROWAVE TRANSCEIVER SYSTEM 审中-公开

    公开(公告)号：US20190028203A1

    公开(公告)日：2019-01-24

    申请号：US16038644

    申请日：2018-07-18

    Applicant: IMRA America, Inc.

    Inventor： Naoya Kuse ,  Antoine Jean Gilbert Rolland ,  Yihan Li ,  Martin E. Fermann

    IPC: H04B10/50 ,  H04J14/02 ,  H04B10/548 ,  G02F3/00

    Abstract: Examples of systems and methods for integrated photonic broadband microwave transceivers are disclosed based on integrated coherent dual optical frequency combs. In some cases, when the system is configured as a transmitter, multiple radio frequency (RF) carriers can be generated, which can either be encoded independently, or used for broadcasting the same information into different bands. In some cases, when the system is configured as a receiver, the spectrum of the input signal can be sliced into several spectral segments for low-bandwidth detection and analysis. In some systems, the optics-related functionalities can be achieved via integrated optic technology, for example based on silicon photonics, providing tremendous possibilities for mass-production with significantly reduced system footprint.

    ULTRA-LOW NOISE PHOTONIC PHASE NOISE MEASUREMENT SYSTEM FOR MICROWAVE SIGNALS
    63.
    发明申请
    ULTRA-LOW NOISE PHOTONIC PHASE NOISE MEASUREMENT SYSTEM FOR MICROWAVE SIGNALS 审中-公开

    公开(公告)号：US20180180655A1

    公开(公告)日：2018-06-28

    申请号：US15901186

    申请日：2018-02-21

    Applicant: IMRA America, Inc.

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

    IPC: G01R29/26 ,  G01R31/28 ,  H04B10/63

    CPC classification number: G01R29/26 ,  G01R23/17 ,  G01R31/2824 ,  H04B10/63 ,  H04B2210/006

    Abstract: Systems and methods for precision phase noise measurements of radio frequency (RF) oscillators are provided. An RF signal under test can be modulated on a continuous wave (cw) laser carrier frequency via generation of modulation sidebands using an appropriate modulator. A photonic delay line can be implemented as a self-heterodyne detection system for the phase noise, allowing for photonic down-conversion of the phase noise measurement to direct current (DC). The self-heterodyne detection system allows detection outside of any 1/f noise issues. Ultra-low phase noise detection for RF frequencies in a range from below 1 GHz to beyond 100 GHz is enabled with a low noise floor in the whole frequency range. Higher-order modulation sidebands can further reduce the noise floor of the system. Ultra-low noise RF (microwave) output can be generated. The RF signal under test can be generated by a dielectric resonance oscillator or opto-electronic oscillator.

    High power short pulse fiber laser
    67.
    发明授权
    High power short pulse fiber laser 有权

    公开(公告)号：US09640940B2

    公开(公告)日：2017-05-02

    申请号：US14685320

    申请日：2015-04-13

    Applicant: IMRA America, Inc.

    Inventor： Xinhua Gu ,  Mark Bendett ,  Gyu Cheon Cho ,  Martin E. Fermann

    IPC: H01S3/098 ,  H01S3/11 ,  H01S3/094 ,  H01S3/16 ,  H01S3/00 ,  H01S3/0941 ,  H01S3/102 ,  H01S3/067 ,  H01S3/13

    CPC classification number: H01S3/1115 ,  H01S3/0057 ,  H01S3/0064 ,  H01S3/0078 ,  H01S3/06712 ,  H01S3/06741 ,  H01S3/06754 ,  H01S3/094003 ,  H01S3/094042 ,  H01S3/0941 ,  H01S3/1028 ,  H01S3/1305 ,  H01S3/1618 ,  H01S3/1698

    Abstract: A pulsed laser comprises an oscillator and amplifier. An attenuator and/or pre-compressor may be disposed between the oscillator and amplifier to improve performance and possibly the quality of pulses output from the laser. Such pre-compression may be implemented with spectral filters and/or dispersive elements between the oscillator and amplifier. The pulsed laser may have a modular design comprising modular devices that may have Telcordia-graded quality and reliability. Fiber pigtails extending from the device modules can be spliced together to form laser system. In one embodiment, a laser system operating at approximately 1050 nm comprises an oscillator having a spectral bandwidth of approximately 19 nm. This oscillator signal can be manipulated to generate a pulse having a width below approximately 90 fs. A modelocked linear fiber laser cavity with enhanced pulse-width control includes concatenated sections of both polarization-maintaining and non-polarization-maintaining fibers. Apodized fiber Bragg gratings and integrated fiber polarizers are included in the cavity to assist in linearly polarizing the output of the cavity. Very short pulses with a large optical bandwidth are obtained by matching the dispersion value of the fiber Bragg grating to the inverse of the dispersion of the intra-cavity fiber.

    Optical scanning and imaging systems based on dual pulsed laser systems
    69.
    发明授权
    Optical scanning and imaging systems based on dual pulsed laser systems 有权
    基于双脉冲激光系统的光学扫描和成像系统

    公开(公告)号：US09252560B2

    公开(公告)日：2016-02-02

    申请号：US14247828

    申请日：2014-04-08

    Applicant: IMRA AMERICA, INC.

    Inventor： Martin E. Fermann ,  Ingmar Hartl

    IPC: H01S3/10 ,  H01S3/11 ,  G01N21/31 ,  H01S3/23 ,  G01B9/02 ,  G02B6/02 ,  H01S3/067 ,  H01S3/08 ,  H01S3/106 ,  H01S3/13 ,  H01S3/139

    CPC classification number: H01S3/10046 ,  G01B9/02001 ,  G01N21/31 ,  G01N2021/317 ,  G02B6/02304 ,  H01S3/0675 ,  H01S3/06754 ,  H01S3/08054 ,  H01S3/1067 ,  H01S3/1068 ,  H01S3/11 ,  H01S3/1115 ,  H01S3/13 ,  H01S3/1307 ,  H01S3/1392 ,  H01S3/1394 ,  H01S3/2383

    Abstract: The invention relates to scanning pulsed laser systems for optical imaging. Coherent dual scanning laser systems (CDSL) are disclosed and some applications thereof. Various alternatives for implementation are illustrated, including highly integrated configurations. In at least one embodiment a coherent dual scanning laser system (CDSL) includes two passively modelocked fiber oscillators. The oscillators are configured to operate at slightly different repetition rates, such that a difference δfr in repetition rates is small compared to the values fr1 and fr2 of the repetition rates of the oscillators. The CDSL system also includes a non-linear frequency conversion section optically connected to each oscillator. The section includes a non-linear optical element generating a frequency converted spectral output having a spectral bandwidth and a frequency comb comprising harmonics of the oscillator repetition rates. A CDSL may be arranged in an imaging system for one or more of optical imaging, microscopy, micro-spectroscopy and/or THz imaging.

    Abstract translation: 本发明涉及用于光学成像的扫描脉冲激光系统。 公开了相干双扫描激光系统（CDSL）及其一些应用。 示出了用于实现的各种替代方案，包括高度集成的配置。 在至少一个实施例中，相干双扫描激光系统（CDSL）包括两个被动锁模光纤振荡器。 振荡器被配置为以稍微不同的重复率操作，使得与振荡器的重复率的值fr1和fr2相比，重复率的差δfr小。 CDSL系统还包括与每个振荡器光学连接的非线性频率转换部分。 该部分包括产生具有频谱带宽的频率转换频谱输出和包括振荡器重复频率的谐波的频率梳的非线性光学元件。 可以在成像系统中布置CDSL以用于光学成像，显微镜，微光谱和/或THz成像中的一种或多种。

    HIGH POWER SHORT PULSE FIBER LASER
    70.
    发明申请
    HIGH POWER SHORT PULSE FIBER LASER 有权
    高功率短脉冲光纤激光器

    公开(公告)号：US20150325977A1

    公开(公告)日：2015-11-12

    申请号：US14685320

    申请日：2015-04-13

    Applicant: IMRA America, Inc.

    Inventor： Xinhua Gu ,  Mark Bendett ,  Gyu Cheon Cho ,  Martin E. Fermann

    IPC: H01S3/11 ,  H01S3/0941 ,  H01S3/16 ,  H01S3/102 ,  H01S3/067 ,  H01S3/094

    CPC classification number: H01S3/1115 ,  H01S3/0057 ,  H01S3/0064 ,  H01S3/0078 ,  H01S3/06712 ,  H01S3/06741 ,  H01S3/06754 ,  H01S3/094003 ,  H01S3/094042 ,  H01S3/0941 ,  H01S3/1028 ,  H01S3/1305 ,  H01S3/1618 ,  H01S3/1698

    Abstract: A pulsed laser comprises an oscillator and amplifier. An attenuator and/or pre-compressor may be disposed between the oscillator and amplifier to improve performance and possibly the quality of pulses output from the laser. Such pre-compression may be implemented with spectral filters and/or dispersive elements between the oscillator and amplifier. The pulsed laser may have a modular design comprising modular devices that may have Telcordia-graded quality and reliability. Fiber pigtails extending from the device modules can be spliced together to form laser system. In one embodiment, a laser system operating at approximately 1050 nm comprises an oscillator having a spectral bandwidth of approximately 19 nm. This oscillator signal can be manipulated to generate a pulse having a width below approximately 90 fs. A modelocked linear fiber laser cavity with enhanced pulse-width control includes concatenated sections of both polarization-maintaining and non-polarization-maintaining fibers. Apodized fiber Bragg gratings and integrated fiber polarizers are included in the cavity to assist in linearly polarizing the output of the cavity. Very short pulses with a large optical bandwidth are obtained by matching the dispersion value of the fiber Bragg grating to the inverse of the dispersion of the intra-cavity fiber.

    Abstract translation: 脉冲激光器包括振荡器和放大器。 衰减器和/或预压缩器可以设置在振荡器和放大器之间以提高性能以及可能的从激光器输出的脉冲的质量。 这种预压缩可以用振荡器和放大器之间的频谱滤波器和/或分散元件来实现。 脉冲激光器可以具有包括可能具有Telcordia分级质量和可靠性的模块化设备的模块化设计。 从设备模块延伸的光纤尾纤可以拼接在一起形成激光系统。 在一个实施例中，在大约1050nm操作的激光系统包括具有约19nm的光谱带宽的振荡器。 该振荡器信号可被操纵以产生宽度低于大约90fs的脉冲。 具有增强的脉冲宽度控制的锁模线性光纤激光腔包括两个偏振保持和非偏振保持光纤的级联部分。 变形纤维布拉格光栅和集成光纤偏振器被包括在空腔中，以帮助线性偏振空腔的输出。 通过将光纤布拉格光栅的色散值与腔内光纤的色散相反来获得具有大光学带宽的非常短的脉冲。

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