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公开(公告)号：US20210063306A1
公开(公告)日：2021-03-04
申请号：US17000924
申请日：2020-08-24
Inventor： Michele Gianella , Andreas Hugi , Markus Mangold , Akshay Nataraj , Lukas Emmenegger
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.
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Patent Agency Ranking
公开(公告)号：US11796392B2
公开(公告)日：2023-10-24
申请号：US18063213
申请日：2022-12-08
Applicant: IRsweep AG
Inventor： Stéphane Schilt , Pierre Brochard , Kenichi Komagata , Giulio Terrasanta , Andreas Hugi
CPC classification number: G01J3/433 , G01J3/10 , H01S5/0623 , H01S5/4006 , G01J2003/102 , G01J2003/423 , G01J2003/4332
Abstract: A dual-comb spectrometer comprising two lasers outputting respective frequency combs having a frequency offset between their intermode beat frequencies. One laser acts as a master and the other as a follower. Although the master laser is driven nominally with a DC drive signal, the current on its drive input line nevertheless oscillates with an AC component that follows the beating of the intermode comb lines lasing in the driven master laser. This effect is exploited by tapping off this AC component and mixing it with a reference frequency to provide the required frequency offset, the mixed signal then being supplied to the follower laser as the AC component of its drive signal. The respective frequency combs in the optical domain are thus phase-locked relative to each other in one degree of freedom, so that the electrical signals obtained by multi-heterodyning the two optical signals are frequency stabilized.
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公开(公告)号：US11629997B2
公开(公告)日：2023-04-18
申请号：US17518874
申请日：2021-11-04
Applicant: IRsweep AG
Inventor： Stéphane Schilt , Pierre Brochard , Kenichi Komagata , Giulio Terrasanta , Andreas Hugi
Abstract: A dual-comb spectrometer comprising two lasers outputting respective frequency combs having a frequency offset between their intermode beat frequencies. One laser acts as a master and the other as a follower. Although the master laser is driven nominally with a DC drive signal, the current on its drive input line nevertheless oscillates with an AC component that follows the beating of the intermode comb lines lasing in the driven master laser. This effect is exploited by tapping off this AC component and mixing it with a reference frequency to provide the required frequency offset, the mixed signal then being supplied to the follower laser as the AC component of its drive signal. The respective frequency combs in the optical domain are thus phase-locked relative to each other in one degree of freedom, so that the electrical signals obtained by multi-heterodyning the two optical signals are frequency stabilized.
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公开(公告)号：US11287319B2
公开(公告)日：2022-03-29
申请号：US16622906
申请日：2018-06-15
Applicant: IRsweep AG
Inventor： Andreas Hugi
IPC: G01J3/10 , G01B9/02003 , G01J3/433 , G01B9/02001
Abstract: A heterodyne detection spectrometer setup comprises an optical path with at least a first cavity able to emit a first laser beam; a second cavity able to emit a second laser beam; and at least one combining and/or reflecting element. The cavities are connected to current drivers for stimulating laser emission, which shows increased signal-to-noise ratios of the heterodyne signal and an increased dynamic range. This can be reached if at least the second cavity comprises an active medium connected to a heterodyne signal extraction element and a (multi-) heterodyne signal processing unit, which is simultaneously usable for laser light generation and as detector element, comprising an active medium introduced in the optical path in order that the first and/or second laser beam can enter the respective other cavity. At least one reference path is established between the two cavities in the optical path with at least two combining and/or reflecting elements.
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公开(公告)号：US11650101B2
公开(公告)日：2023-05-16
申请号：US18063217
申请日：2022-12-08
Applicant: IRsweep AG
Inventor： Stéphane Schilt , Pierre Brochard , Kenichi Komagata , Giulio Terrasanta , Andreas Hugi
CPC classification number: G01J3/433 , H01S5/0623 , H01S5/4006 , G01J2003/102 , G01J2003/423 , G01J2003/4332
Abstract: A dual-comb spectrometer comprising two lasers outputting respective frequency combs having a frequency offset between their intermode beat frequencies. One laser acts as a master and the other as a follower. Although the master laser is driven nominally with a DC drive signal, the current on its drive input line nevertheless oscillates with an AC component that follows the beating of the intermode comb lines lasing in the driven master laser. This effect is exploited by tapping off this AC component and mixing it with a reference frequency to provide the required frequency offset, the mixed signal then being supplied to the follower laser as the AC component of its drive signal. The respective frequency combs in the optical domain are thus phase-locked relative to each other in one degree of freedom, so that the electrical signals obtained by multi-heterodyning the two optical signals are frequency stabilized.
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公开(公告)号：US11293861B2
公开(公告)日：2022-04-05
申请号：US17000924
申请日：2020-08-24
Inventor： Michele Gianella , Andreas Hugi , Markus Mangold , Akshay Nataraj , Lukas Emmenegger
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.
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