公开(公告)号：US20220146312A1

公开(公告)日：2022-05-12

申请号：US17518874

申请日：2021-11-04

Applicant: IRsweep AG

Inventor： Stéphane SCHILT ,  Pierre BROCHARD ,  Kenichi KOMAGATA ,  Giulio TERRASANTA ,  Andreas HUGI

IPC: G01J3/433

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.

公开(公告)号：US20210131868A1

公开(公告)日：2021-05-06

申请号：US16622906

申请日：2018-06-15

Applicant: IRsweep AG

Inventor： Andreas HUGI

IPC: G01J3/10 ,  G01J3/433

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.