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1. 发明授权

US12032201B2 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.

2. 发明授权

US11381054B2 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.

3. 发明授权

US11043783B2 Optical arrangement 有权
公开(公告)号：US11043783B2
公开(公告)日：2021-06-22
申请号：US16065829
申请日：2016-12-20
申请人： Fraunhofer-Gesellschaft zur Förderung der Angewandten Forschung E.V. , Friedrich-Schiller-Universität Jena
发明人： Michael Müller , Marco Kienel , Arno Klenke , Jens Limpert , Andreas Tünnermann
IPC分类号： G02B26/00 , H01S3/00 , G02B27/10 , G02B27/28 , H01S3/067 , H01S3/23
摘要： The invention relates to an optical arrangement having a division element which divides an input beam consisting of a sequence of temporally equidistant light pulses into two spatially separate partial beams, at least one optical element through which at least one of the partial beams propagates, and at least one combination element which spatially superimposes the partial beams in an output beam. It is the object of the present invention to show a method for increasing the pulse energy of light pulses which is improved in comparison with the prior art. The invention solves this problem by virtue of the fact that the combination element superimposes a number of the temporally successive light pulses in a single light pulse in the output beam. The invention also relates to a method for increasing the pulse energy of light pulses.

4. 发明授权

US09235106B2 Method and device for reducing mode instability in an optical waveguide 有权
标题翻译：用于减少光波导中的模式不稳定性的方法和装置
公开(公告)号：US09235106B2
公开(公告)日：2016-01-12
申请号：US14391840
申请日：2013-04-12
申请人： FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG e.V. , FRIEDRICH-SCHILLER-UNIVERSITÄT JENA
发明人： César Jáuregui Misas , Hans-Jürgen Otto , Fabian Stutzki , Florian Jansen , Tino Eidam , Jens Limpert , Andreas Tünnermann
IPC分类号： G02F1/365 , H01S3/067 , H01S3/10 , H01S3/13 , H01S3/094
CPC分类号： G02F1/365 , H01S3/06704 , H01S3/06737 , H01S3/06754 , H01S3/06787 , H01S3/094011 , H01S3/10015 , H01S3/1003 , H01S3/1302
摘要： The invention relates to a method and corresponding devices for reducing mode instability in an optical waveguide (1), a light signal becoming unstable in the optical waveguide (1) beyond an output power threshold and energy being transformed from a basic mode into higher order modes. The invention proposes a reduction in temperature variation (2) along the optical waveguide (1) and/or a reduction in changes in the optical waveguide (1) that are caused by spatial temperature variation as a result of mode interference.
摘要翻译：本发明涉及一种用于减少光波导（1）中的模式不稳定性的方法和相应的装置，光信号在光波导（1）中变得不稳定，超过输出功率阈值，能量从基本模式变换为高阶模式。本发明提出沿着光波导（1）的温度变化（2）的降低和/或由于模式干扰而导致的由空间温度变化引起的光波导（1）的变化的减小。

5. 发明授权

US11579512B2 Device and method for generating laser pulses 有权
公开(公告)号：US11579512B2
公开(公告)日：2023-02-14
申请号：US16074240
申请日：2017-02-01
申请人： FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V. , FRIEDRICH-SCHILLER-UNIVERSITÄT JENA
发明人： Thomas Gottschall , Jens Limpert , Andreas Tünnermann
IPC分类号： G02F1/39 , H01S3/067 , H01S3/00 , H01S3/1118 , H01S3/13
摘要： A device for generating laser pulses is provided, the device having an optical parametric oscillator converts the laser pulses of a pump laser to laser pulses at a signal wavelength and at an idler wavelength. The optical parametric oscillator has an optical resonator with a non-linear wavelength converter. It is an object of the invention to provide a device that makes efficient generation of synchronous laser pulse trains with two different central wavelengths possible. To this end, the invention proposes that the pump laser is tunable with respect to the pump wavelength and the repetition frequency, wherein the resonator has an optical fibre with a dispersion in the range of 10-100 ps/nm and a length of 10-1000 m. The invention furthermore relates to a method for generating laser pulses using such a device.

6. 发明授权

US11211762B2 Generating synchronized laser pulses at variable wavelengths 有权
公开(公告)号：US11211762B2
公开(公告)日：2021-12-28
申请号：US16630545
申请日：2018-07-12
申请人： Fraunhofer-Gesellschaft zur Förderung der Angewandten Forschung E.V. , Friedrich-Schiller-Universität Jena , Leibniz-Institut Für Photonische Technologien E.V.
发明人： Thomas Gottschall , Jens Limpert , Andreas Tünnermann , Tobias Meyer , Jürgen Popp
IPC分类号： H01S3/00 , H01S3/094 , H01S3/108 , H01S3/11
摘要： The invention relates to an apparatus for generating laser pulses. It is an object of the invention to provide a method for generating synchronized laser pulse trains at variable wavelengths (e.g., for coherent Raman spectroscopy/microscopy), wherein the switching time for switching between different wavelengths should be in the sub-μs range. For this purpose the apparatus according to the invention comprises a pump laser (1), which emits pulsed laser radiation at a specified wavelength, an FDML laser (3), which emits continuous wave laser radiation at a cyclically variable wavelength, and a nonlinear conversion medium (4), in which the pulsed laser radiation of the pump laser (1) and the continuous wave laser radiation of the FDML laser (3) are superposed. In the nonlinear conversion medium (4) the pulsed laser radiation of the pump laser (1) and the continuous wave laser radiation of the FDML laser (3) are converted in an optical parametric process into pulsed laser radiation at a signal wavelength and an idler wavelength that differs therefrom. Furthermore the invention relates to a method for generating laser pulses.

7. 发明申请

US20150063767A1 METHOD AND DEVICE FOR REDUCING MODE INSTABILITY IN AN OPTICAL WAVEGUIDE 有权
标题翻译：用于降低光波导中的模态不稳定性的方法和装置
公开(公告)号：US20150063767A1
公开(公告)日：2015-03-05
申请号：US14391840
申请日：2013-04-12
申请人： FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG e.V. , FRIEDRICH-SCHILLER-UNIVERSITÄT JENA
发明人： César Jáuregui Misas , Hans-Jürgen Otto , Fabian Stutzki , Florian Jansen , Tino Eidam , Jens Limpert , Andreas Tünnermann
IPC分类号： G02F1/365 , H01S3/067
CPC分类号： G02F1/365 , H01S3/06704 , H01S3/06737 , H01S3/06754 , H01S3/06787 , H01S3/094011 , H01S3/10015 , H01S3/1003 , H01S3/1302
摘要： The invention relates to a method and corresponding devices for reducing mode instability in an optical waveguide (1), a light signal becoming unstable in the optical waveguide (1) beyond an output power threshold and energy being transformed from a basic mode into higher order modes. The invention proposes a reduction in temperature variation (2) along the optical waveguide (1) and/or a reduction in changes in the optical waveguide (1) that are caused by spatial temperature variation as a result of mode interference.
摘要翻译：本发明涉及一种用于减少光波导（1）中的模式不稳定性的方法和相应的装置，光信号在光波导（1）中变得不稳定，超过输出功率阈值，能量从基本模式变换为高阶模式。本发明提出沿着光波导（1）的温度变化（2）的降低和/或由于模式干扰而导致的由空间温度变化引起的光波导（1）的变化的减小。

8. 发明申请

US20160320687A1 Apparatus and Method for Producing Short Radiation Pulses 有权
标题翻译：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。

9. 发明授权

US11262312B2 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.

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