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    Apparatus and Method for Producing Short Radiation Pulses
    1.
    发明申请
    Apparatus and Method for Producing Short Radiation Pulses 有权
    用于生产短辐射脉冲的装置和方法

    公开(公告)号：US20160320687A1

    公开(公告)日：2016-11-03

    申请号：US15032525

    申请日：2014-10-28

    申请人： FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWAND TEN FORSCHUNG E.V. ,  FRIEDRICH-SCHILLER-UNIVERSITÄT JENA

    发明人： Thomas Gottschall ,  Jens Limpert ,  Andreas Tunnermann ,  Martin Baumgartl

    IPC分类号： G02F1/39 ,  G02F1/35

    CPC分类号： G02F1/39 ,  G02F1/3536 ,  G02F1/395 ,  G02F2201/02 ,  G02F2203/15

    摘要： The invention relates to an apparatus (1) for producing short synchronous radiation pulses at different wavelengths, particularly to an optically parametric oscillator, comprising at least one pump radiation source (2), preferably a pump laser, for outputting radiation at a pump wavelength, and a resonator (3) having a wavelength-dependent effective resonator length, wherein the resonator (3) has a non-linear wavelength converter (4) for producing radiation at a first and a second wavelength; a dispersive element (5) having a strong wavelength-dependent delay characteristic; and a coupling-out element (6) for at least partially coupling-out the radiation from the resonator (3). In addition, the invention relates to a method for producing short radiation pulses by means of an apparatus (1), particularly an optically parametric oscillator.

    摘要翻译： 本发明涉及一种用于产生不同波长的短同步辐射脉冲的装置（1），特别是涉及一种光学参量振荡器，包括用于输出泵浦波长的辐射的至少一个泵浦辐射源（2），优选为泵浦激光器， 以及具有波长相关的有效谐振器长度的谐振器（3），其中所述谐振器（3）具有用于产生第一和第二波长的辐射的非线性波长转换器（4） 具有强烈的波长相关延迟特性的色散元件（5）; 以及用于至少部分地耦合来自谐振器（3）的辐射的耦合输出元件（6）。 此外，本发明涉及一种借助于装置（1）产生短辐射脉冲的方法，特别是光学参数振荡器。

    Optical waveguide
    5.
    发明授权
    Optical waveguide 有权

    公开(公告)号：US12032201B2

    公开(公告)日：2024-07-09

    申请号：US17616720

    申请日：2020-06-04

    申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. ,  Friedrich-Schiller-Universität Jena

    发明人： César Jáuregui Misas ,  Jens Limpert ,  Andreas Tünnermann

    IPC分类号： G02B6/02

    CPC分类号： G02B6/02042 ,  G02B6/021

    摘要： The invention relates to an optical waveguide with two or more light-guiding cores (1a-1e) extending continuously along the longitudinal extension of the optical waveguide, parallel to one another and spaced apart from one another, from one end of the optical waveguide to the other, and with a first cladding (2) enclosing the cores (1a-1e). It is an object of the invention to provide a multicore optical waveguide for high-power operation with reduced system complexity compared to the prior art. This object is achieved by the invention in that the cores (1a-1e) are arranged relative to one another and are spaced apart from one another in such a way that the propagation modes of the light propagating in the optical waveguide at a working wavelength couple to one another, the length of the optical waveguide being selected such that the light coupled into only a single one of the cores (1a-1e) at one end of the optical waveguide first spreads to the other cores (1a-1e) during propagation through the optical waveguide and, after passing through the optical waveguide, leaves the optical waveguide again at the other end from a single core (1a) with at least 60%, preferably at least 75%, of the total light power propagating in the optical waveguide. The invention also relates to a laser system with such an optical waveguide as an optical amplifier, and a method for guiding light in an optical waveguide.

    Avoiding mode instability in an optical amplifier fiber
    6.
    发明授权
    Avoiding mode instability in an optical amplifier fiber 有权

    公开(公告)号：US11381054B2

    公开(公告)日：2022-07-05

    申请号：US16631867

    申请日：2018-07-17

    申请人： Fraunhofer-Gesellschaft zur Förderung der Angewandten Forschung E.V. ,  Friedrich-Schiller-Universität Jena

    发明人： Christoph Stihler ,  César Jáuregui Misas ,  Jens Limpert ,  Andreas Tünnermann

    IPC分类号： H01S3/067 ,  G02B6/14 ,  G02B6/34 ,  H04B10/2543 ,  H04B10/2581

    摘要： The invention relates to a method for stably transmitting laser radiation through an optical waveguide (3), wherein two or more modes of the laser radiation propagating in the optical waveguide (3) interfere and form a mode interference pattern in the optical waveguide, as a result of which a thermally induced refractive index grating is produced in the optical waveguide (3). It is an object of the invention to demonstrate an effective approach for stabilizing the output signal of the optical waveguide (3) in a fiber-based laser/amplifier combination at high output powers, i.e. for avoiding mode instability. The invention achieves this object by virtue of the fact that a relative spatial phase shift between the mode interference pattern and the thermally induced refractive index grating is set in the direction of propagation of the laser radiation. In addition, the invention relates to a laser/amplifier combination comprising a laser (1) and an optical waveguide (3) in the form of an amplifier fiber, wherein the optical waveguide (3) amplifies the radiation of the laser (1) propagating therein. The invention proposes an actuating element (7), which produces a predefinable relative spatial phase shift of the mode interference pattern and of the thermally induced refractive index grating in the direction of propagation of the laser radiation.

    Laser microscope with ablation function
    9.
    发明授权
    Laser microscope with ablation function 有权

    公开(公告)号：US11262312B2

    公开(公告)日：2022-03-01

    申请号：US16303558

    申请日：2017-05-19

    申请人： LEIBNIZ-INSTITUT FÜR PHOTONISCHE ,  FRIEDRICH-SCHILLER-UNIVERSITÄT JENA

    发明人： Jürgen Popp ,  Michael Schmitt ,  Tobias Meyer-Zedler ,  Stefan Nolte ,  Roland Ackermann ,  Jens Limpert

    IPC分类号： G01N21/71 ,  G01N21/64 ,  G01N21/65

    摘要： An exemplary laser microscope can be provided, comprising at least one first laser source which emits at least one (e.g., pulsed) excitation beam, a scanning optical configuration (e.g., configured to scan the excitation beam over the surface of a sample), a focusing optical configuration (e.g., configured to focus the excitation beam onto the sample), and at least one detector configured to detect light emitted by the sample due to an optical effect in response to the excitation beam. A second laser source facilitates a pulsed ablation beam for a local ablation of the material of the sample. The ablation beam can be guided to the sample via the scanning and focusing optical configurations. The first and second laser sources can be fed by a mutual continuous wave pump laser and/or a mutual pulsed pump laser. The first laser source can emit pulses with at least two different wavelengths.