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643 records (took 0.025 seconds)

    261.
    发明专利
    未知

    公开(公告)号：DE19802845B4

    公开(公告)日：2005-11-10

    申请号：DE19802845

    申请日：1998-01-26

    Applicant: IMRA AMERICA INC

    Inventor： FERMANN MARTIN E ,  GALVANAUSKAS ALMANTAS ,  HARTER DONALD J

    IPC: G02F1/35 ,  G02F1/37 ,  H01S3/067 ,  H01S3/07 ,  H01S3/109 ,  H01S3/16 ,  H01S3/23 ,  H01S3/30 ,  H01S3/108 ,  H01S3/17

    Abstract: An apparatus generates femtosecond pulses from laser amplifiers by nonlinear frequency conversion. The implementation of nonlinear frequency-conversion allows the design of highly nonlinear amplifiers at a signal wavelength (SW), while still preserving a high-quality pulse at an approximately frequency-doubled wavelength (FDW). Nonlinear frequency-conversion also allows for limited wavelength tuning of the FDW. As an example, the output from a nonlinear fiber amplifier is frequency-converted. By controlling the polarization state in the nonlinear fiber amplifier and by operating in the soliton-supporting dispersion regime of the host glass, an efficient nonlinear pulse compression for the SW is obtained. The generated pulse width is optimized by utilizing soliton compression in the presence of the Raman-self-frequency shift in the nonlinear fiber amplifier at the SW. High-power pulses are obtained by employing fiber amplifiers with large core-diameters. The efficiency of the nonlinear fiber amplifier is optimized by using a double clad fiber (i.e., a fiber with a double-step refractive index profile) and by pumping light directly into the inner core of this fiber. Periodically poled LiNbO3 (PPLN) is used for efficient conversion of the SW to a FDW. The quality of the pulses at the FDW can further be improved by nonlinear frequency conversion of the compressed and Raman-shifted signal pulses at the SW. The use of Raman-shifting further increases the tuning range at the FDW. For applications in confocal microscopy, a special linear fiber amplifier is used.

    263.
    发明专利
    未知

    公开(公告)号：DE69801719T2

    公开(公告)日：2002-04-18

    申请号：DE69801719

    申请日：1998-06-19

    Applicant: IMRA AMERICA INC

    Inventor： DELNICK DR

    IPC: H01M6/48 ,  B41J2/01 ,  H01M2/36 ,  H01M4/04 ,  B41J2/14

    Abstract: A process for manufacturing an electrochemical cell comprising the steps of providing an electrode and applying electrolyte to the electrode using an ink-jet printer. In the preferred embodiment of the present invention, an ink-jet printing process is utilized to print the electrolyte onto the surface of the electrodes and separators or the electrode/separator bilayers. The ink-jet printing accurately meters and uniformly distributes the electrolyte throughout the pore structure of the separator and the electrode without contaminating the cell gasket. Preferably, a drop-on-demand ink-jet printing head is used to facilitate the electrolyte printing process. The ink-jet printing head is electronically pulsed to form and eject the electrolyte droplets from a nozzle of printing-head. The volume and the distribution of each electrolyte droplet are accurately determined and controlled by varying the pulse width and the pulse frequency of the printing head.

    Mode coupled laser with co-doped fibre
    267.
    发明专利
    Mode coupled laser with co-doped fibre 未知

    公开(公告)号：DE19635919A1

    公开(公告)日：1997-03-06

    申请号：DE19635919

    申请日：1996-09-04

    Applicant: IMRA AMERICA INC

    Inventor： FERMANN MARTIN E DR ,  HARTER DONALD J DR

    IPC: H01S3/098 ,  H01S3/06 ,  H01S3/067 ,  H01S3/094 ,  H01S3/093

    Abstract: The mode coupled laser includes a co-doped fibre (101) in a resonator which acts as an amplifying material to generate laser energy in the form of impulses shorter than 100 psec. A laser diode array (103) coupled to an end of the fibre pumps the fibre with pump light. A reflector device (102) in the resonator reflects energy along an axis which passes the fibre. An output device (117) receives energy produced inside the resonator and outputs part of the energy. A mode coupling initiating device (118) initiates the production of short impulses in the resonator. The sheath mode is suppressed in the fibre and dispersion controlled in the resonator.

    Optical sensor with integrated laser diode
    268.
    发明专利
    Optical sensor with integrated laser diode 未知

    公开(公告)号：DE19621584A1

    公开(公告)日：1996-12-05

    申请号：DE19621584

    申请日：1996-05-29

    Applicant: IMRA AMERICA INC

    Inventor： BENDETT MARK P DR

    IPC: G01J1/02 ,  G01N21/39 ,  G01N21/41 ,  G02B6/12 ,  H01S3/07 ,  H01S3/08 ,  G02B6/124 ,  H01S3/091

    Abstract: An optical sensor (12) for chemical recognition or measurement in the environment comprises a laser diode light source (10), an integral waveguide (12) within which the beam is carried and a detector (28). The waveguide consists of a glass substrate (16) with a channel (18), enriched with rare metals and with reflectors (20, 22) at both ends. The passage of the laser along the waveguide excites the rare metals, causing increased light emission. This amplifies the changes to the light beam resulting from the presence of the chemicals under analysis, such as changes in wavelength or output, which are picked up by the detector.

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