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.

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.

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。