Doppelfrequenzkamm-Spektroskopie

Details

Veröffentlichungs-Nr.

EP3786597

Aktenzeichen

EP20191273

Anmeldetag

17. August 2020

Veröffentlichung

29. November 2023

Erteilung

29. November 2023

Rechtsraum

EP

IPC

G01J3/42G01J3/10H01S5/10

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.

Anmelder

Firmen

Sensirion AG
EMPA Eidgenössische Materialprüfungs- und Forschungsanstalt
IRsweep AG

Land

🇨🇭 Schweiz

Fachgebiete