中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

202 records (took 0.028 seconds)

    Systems and methods for low noise frequency multiplication, division, and synchronization
    112.
    发明授权
    Systems and methods for low noise frequency multiplication, division, and synchronization 有权

    公开(公告)号：US10454238B2

    公开(公告)日：2019-10-22

    申请号：US15725849

    申请日：2017-10-05

    Applicant: IMRA America, Inc.

    Inventor： Martin E. Fermann ,  Naoya Kuse

    IPC: H01S3/13 ,  H01S3/067 ,  H01S3/00 ,  H03B17/00 ,  H01S3/107 ,  H01S3/11 ,  H01S3/136 ,  H01S3/23 ,  H03D7/14 ,  H03F3/08 ,  H03L7/24

    Abstract: Low phase noise radio frequency (RF) sources generated by voltage controlled oscillators (VCOs) are described. Optical modulators driven by a VCO may be used to generate optical side-bands to cw lasers. The spectral extent of said side-bands can be increased via frequency broadening in highly nonlinear waveguides. Free running mode locked low phase noise comb oscillators can be used as reference oscillators to generate beat signals between those side-bands and individual comb modes at distal spectral regions, thereby creating an error signal used to reduce the phase noise of VCOs and the generation of low phase noise RF signals. VCO phase noise may be reduced by using free-running modelocked comb lasers phase locked to external frequency references, by omitting a reference comb and using a nonlinear interferometer for generating an error signal, or by locking a slave comb to the modulation frequency of an intra-cavity modulator driven by the VCO.

    Methods for preparing aqueous suspension of precious metal nanoparticles
    114.
    发明授权
    Methods for preparing aqueous suspension of precious metal nanoparticles 有权

    公开(公告)号：US10184025B2

    公开(公告)日：2019-01-22

    申请号：US14161773

    申请日：2014-01-23

    Applicant: IMRA AMERICA, INC.

    Inventor： Yuki Ichikawa ,  Andrius Marcinkevicus ,  Masayuki Ito ,  Wei Qian

    IPC: B01J13/00 ,  C08G65/328 ,  B82Y30/00

    Abstract: The present disclosure is directed to methods of preparing stable suspensions of precious metal nanoparticles and methods for attaching bio-molecules to the nanoparticles. The formation of nanoparticles can be accomplished by either chemical synthesis or pulsed laser ablation in a liquid. The present disclosure reveals the importance of controlling the conductivity of the dispersion medium during pulsed laser ablation in a liquid to control the particle size of the nanoparticles. The present disclosure also reveals the importance of adjusting and maintaining the conductivity in a range of 25 μS/cm or less during storage of the nanoparticles and just prior to performing bioconjugation reactions. The control of conductivity is an important process for maintaining the nanoparticles as a stable non-aggregated colloidal suspension in a dispersion medium.

    Polarizing and polarization maintaining leakage channel fibers
    115.
    发明授权
    Polarizing and polarization maintaining leakage channel fibers 有权

    公开(公告)号：US10036850B2

    公开(公告)日：2018-07-31

    申请号：US15146693

    申请日：2016-05-04

    Applicant: IMRA America, Inc.

    Inventor： Shigeru Suzuki ,  Hugh A. McKay ,  Martin E. Fermann

    IPC: G02B6/024 ,  G02B6/02 ,  G02B6/036

    CPC classification number: G02B6/024 ,  G02B6/02009 ,  G02B6/02042 ,  G02B6/02314 ,  G02B6/02319 ,  G02B6/02342 ,  G02B6/02357 ,  G02B6/03694

    Abstract: This disclosure relates to polarizing optical fibers and polarization maintaining optical fibers, including active and/or passive implementations. An embodiment includes a polarizing (PZ) optical fiber that includes stress applying parts (SAPs) disposed in a first cladding region, the SAPs comprising a material with a thermal expansion coefficient, αSAP. A core region is at least partially surrounded by cladding features and the SAPs. The core includes glass with a thermal expansion coefficient, αcore. The arrangement of the SAPs satisfies: Rsc=dSAP/Dsc, where Dsc is the SAP center to core center distance, and dSAP is the average SAP diameter, and dα=|αSAP−αcore|, and where Rsc and dα may be sufficiently large to induce stress birefringence into the core and to provide for polarized output. Active fibers in which a portion of the fiber is doped may be implemented for application in fiber lasers, fiber amplifiers, and/or optical pulse compressors.

    Compact fiber short pulse laser sources
    119.
    发明授权
    Compact fiber short pulse laser sources 有权

    公开(公告)号：US09819141B2

    公开(公告)日：2017-11-14

    申请号：US15146675

    申请日：2016-05-04

    Applicant: IMRA America, Inc.

    Inventor： Martin E. Fermann

    IPC: H01S3/11 ,  H01S3/067 ,  H01S3/1055 ,  H01S3/106 ,  H01S3/107 ,  H01S3/13 ,  H01S3/16

    CPC classification number: H01S3/1112 ,  H01S3/06712 ,  H01S3/06725 ,  H01S3/0675 ,  H01S3/1055 ,  H01S3/1067 ,  H01S3/107 ,  H01S3/1115 ,  H01S3/1307 ,  H01S3/161 ,  H01S3/1616 ,  H01S2301/085

    Abstract: Examples of robust self-starting passively mode locked fiber oscillators are described. In certain implementations, the oscillators are configured as Fabry-Perot cavities containing an optical loop mirror on one cavity end and a bulk mirror or saturable absorber on the other end. The loop mirror can be further configured with an adjustable line phase delay to optimize modelocking. All intra-cavity fiber(s) can be polarization maintaining. Dispersion compensation components such as, e.g., dispersion compensation fibers, bulk diffraction gratings or fiber Bragg gratings may be included. The oscillators may include a bandpass filter to obtain high pulse energies when operating in the similariton regime. The oscillator output can be amplified and used whenever high power short pulses are required. For example the oscillators can be configured as frequency comb sources or supercontinuum sources. In conjunction with repetition rate modulation, applications include dual scanning delay lines and trace gas detection.

Patent Agency Ranking