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    Dual-comb spectroscopy
    1.
    发明授权
    Dual-comb spectroscopy 有权

    公开(公告)号：US11293861B2

    公开(公告)日：2022-04-05

    申请号：US17000924

    申请日：2020-08-24

    Applicant: IRsweep AG ,  EMPA EIDGENÖSSISCHE MATERIAL PRÜFUNGS—UND FORSCHUNGSANSTALT

    Inventor： Michele Gianella ,  Andreas Hugi ,  Markus Mangold ,  Akshay Nataraj ,  Lukas Emmenegger

    IPC: G01J3/45 ,  G01N21/39 ,  H01S5/34 ,  H01S5/40

    Abstract: A dual-comb spectrometer 5 with two lasers 10, 12 serving as a local oscillator and an interrogator. The lasers output light beams with respective frequency combs C1, C2 of defined free spectral range, FSR. A detector 30 can detect heterodyne mixing of the combined beams to detect an RF frequency comb C3. Respective control signals are supplied to the lasers which have functional forms configured to cause the frequencies of the lasers' frequency combs C1, C2 to tune over a defined fraction of their FSR. This enables a reduction of the effective spectral sampling period by a factor equal to the ratio of the FSR to the spectral resolution of the spectrometer, which will typically be several orders of magnitude, so that the spectral sampling period can be reduced from the GHz to the MHz range, which in turn enables a gapless spectrum to be obtained in a short time.

    DUAL-COMB SPECTROSCOPY
    3.
    发明申请
    DUAL-COMB SPECTROSCOPY 有权

    公开(公告)号：US20210063306A1

    公开(公告)日：2021-03-04

    申请号：US17000924

    申请日：2020-08-24

    Applicant: IRsweep AG ,  EMPA EIDGENÖSSISCHE MATERIAL PRÜFUNGS- UND FORSCHUNGSANSTALT

    Inventor： Michele Gianella ,  Andreas Hugi ,  Markus Mangold ,  Akshay Nataraj ,  Lukas Emmenegger

    IPC: G01N21/39 ,  G01J3/45

    Abstract: A dual-comb spectrometer 5 with two lasers 10, 12 serving as a local oscillator and an interrogator. The lasers output light beams with respective frequency combs C1, C2 of defined free spectral range, FSR. A detector 30 can detect heterodyne mixing of the combined beams to detect an RF frequency comb C3. Respective control signals are supplied to the lasers which have functional forms configured to cause the frequencies of the lasers' frequency combs C1, C2 to tune over a defined fraction of their FSR. This enables a reduction of the effective spectral sampling period by a factor equal to the ratio of the FSR to the spectral resolution of the spectrometer, which will typically be several orders of magnitude, so that the spectral sampling period can be reduced from the GHz to the MHz range, which in turn enables a gapless spectrum to be obtained in a short time.

    METHOD FOR REDUCING INTERFERENCE FRINGES IN LASER SPECTROSCOPY MEASUREMENTS USING AN ABSORPTION MASK IN COMBINATION WITH MULTI-PASS OPTICAL CELLS
    5.
    发明申请
    METHOD FOR REDUCING INTERFERENCE FRINGES IN LASER SPECTROSCOPY MEASUREMENTS USING AN ABSORPTION MASK IN COMBINATION WITH MULTI-PASS OPTICAL CELLS 有权
    使用吸收掩模与多光子细胞组合的激光光谱测量中减少干涉性纤维的方法

    公开(公告)号：US20150300942A1

    公开(公告)日：2015-10-22

    申请号：US14434171

    申请日：2013-10-07

    Applicant: EMPA EIDGENÖSSISCHE MATERIAL-PRÜFUNGS- UND FORSCHUNGSANSTALT

    Inventor： Markus Mangold ,  Bela Tuzson ,  Lukas Emmenegger

    IPC: G01N21/03 ,  G01N21/3504

    CPC classification number: G01N21/031 ,  G01N21/3504 ,  G01N2201/064

    Abstract: A Multi-pass optical cell (1) with an internal space (11) for laser spectroscopy is described, which is able to reduce or eliminate interference fringes appearing by performing laser absorption spectroscopy in the multi-pass optical cells (1) leading to improved absorption spectra. This is achieved by using a multi-pass optical cell (1) comprising an absorption mask (3) which is permanently or removable mountable in the internal space (11) in a rotatably fixed manner, where in a mask wall (30) a plurality of m apertures (300) is formed, in which the position of each aperture (300) is adapted to a predefinable propagation path of a main optical beam and/or the resulting reflection spot pattern (211) defined by the geometry of the multi-pass optical cell (1) and the used angle of incidence of an initial beam (20), so that each aperture (300) is traversable by the main optical beam from a first side (301) to a second side (302).

    Abstract translation: 描述了具有用于激光光谱的内部空间（11）的多通光学单元（1），其能够通过在多通道光学单元（1）中执行激光吸收光谱来减少或消除出现的干涉条纹，从而改善 吸收光谱。 这通过使用包括吸收掩模（3）的多通道光学单元（1）来实现，该吸收掩模永久地或可移除地以可旋转地固定的方式安装在内部空间（11）中，其中在掩模壁（30）中具有多个 形成m个孔（300），其中每个孔（300）的位置适合于主光束的预定义传播路径和/或由多光束的几何形状限定的所得到的反射光斑图案（211） 通过光学单元（1）和初始光束（20）的使用入射角，使得每个孔径（300）能够通过主光束从第一侧（301）到第二侧（302）穿过。

    SURFACE MODIFIED CELLULOSE NANOFIBERS
    6.
    发明申请
    SURFACE MODIFIED CELLULOSE NANOFIBERS 审中-公开
    表面改性纤维素纳米纤维

    公开(公告)号：WO2010066905A1

    公开(公告)日：2010-06-17

    申请号：PCT/EP2009/067005

    申请日：2009-12-11

    Applicant: EMPA EIDGENÖSSISCHE MATERIAL-PRÜFUNGS UND FORSCHUNGSANSTALT ,  BORDEANU, Nico ,  EYHOLZER, Christian ,  ZIMMERMANN, Tanja

    Inventor： BORDEANU, Nico ,  EYHOLZER, Christian ,  ZIMMERMANN, Tanja

    IPC: C08B15/05

    CPC classification number: C08B15/05

    Abstract: A process for manufacturing surface modified cellulose nanofibers comprises the step of reacting a first amount of cellulose nanofibers having a diameter of about 2 nm to about 100 nm with a second amount of an alkoxysilane compound. Thereby, said surface modified cellulose nanofibers are formed having a fraction α of hydroxyl functional groups present at the surface being condensed to the alkoxysilane compound. This is followed by the step of isolating said surface modified cellulose nanofibers, the isolation including a drying step.

    Abstract translation: 一种制备表面改性纤维素纳米纤维的方法包括使第二量的烷氧基硅烷化合物使第一量的直径为约2nm至约100nm的纤维素纳米纤维反应的步骤。 由此，形成表面改性纤维素纳米纤维，其表面上存在的羟基官能团的一部分被缩合成烷氧基硅烷化合物。 然后分离所述表面改性纤维素纳米纤维的步骤，所述分离包括干燥步骤。

    FREQUENCY SHIFT MEASUREMENT OF FREQUENCY COMBS
    8.
    发明公开
    FREQUENCY SHIFT MEASUREMENT OF FREQUENCY COMBS 审中-公开

    公开(公告)号：EP4123272A1

    公开(公告)日：2023-01-25

    申请号：EP21186382.4

    申请日：2021-07-19

    Applicant: EMPA Eidgenössische Material Prüfungs- und Forschungsanstalt ,  ETH Zürich

    Inventor： Gianella, Michele ,  Vogel, Simon ,  Emmenegger, Lukas ,  Faist, Jérôme

    IPC: G01J3/433 ,  G01J3/10

    Abstract: A frequency-comb spectrometer is supplemented with an unbalanced interference device 1 which receives a portion of the comb beam, splits it into two portions and recombines them after delaying one longer than the other through an optical path difference ΔL that is set to fulfil a matching condition which ensures that the contributions arising from the individual comb lines are all in-phase and so produce a detectable amplitude variation in the recombined beam when the frequency of the comb shifts. This amplitude variation is collected as an interference signal concurrently with collecting the usual spectral data signal and is used to compute the time-varying frequency shift of the comb, thereby allowing the frequency axis of the sample spectrum to be calibrated.

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