Time delay interferometry using laser frequency comb as the direct signal source

2022 ◽  
Vol 151 ◽  
pp. 106938
Hanzhong Wu ◽  
Panpan Wang ◽  
Peng Hao ◽  
Yuanbo Du ◽  
Yujie Tan ◽  
2021 ◽  
pp. 2000417
Luigi Consolino ◽  
Annamaria Campa ◽  
Michele De Regis ◽  
Francesco Cappelli ◽  
Giacomo Scalari ◽  

2014 ◽  
Vol 14 (8) ◽  
pp. 1037-1045 ◽  
Fei Zhao ◽  
Gang Zhao ◽  
Gaspare Lo Curto ◽  
Hui-Juan Wang ◽  
Yu-Juan Liu ◽  

2016 ◽  
Vol 733 ◽  
pp. 012058 ◽  
I L M Silva ◽  
I B Couceiro ◽  
M A C Torres ◽  
P A Costa ◽  
H P H Grieneisen

2007 ◽  
Vol 15 (19) ◽  
pp. 12161 ◽  
Parama Pal ◽  
Wayne H. Knox ◽  
Ingmar Hartl ◽  
Martin E. Fermann

2021 ◽  
Urban Senica ◽  
Tudor Olariu ◽  
Paolo Micheletti ◽  
Mattias Beck ◽  
Jérôme Faist ◽  

2020 ◽  
Vol 645 ◽  
pp. A23
F. Zhao ◽  
G. Lo Curto ◽  
L. Pasquini ◽  
J. I. González Hernández ◽  
J. R. De Medeiros ◽  

Aims. We study the 2D spectral line profile of the High Accuracy Radial Velocity Planet Searcher (HARPS), measuring its variation with position across the detector and with changing line intensity. The characterization of the line profile and its variations are important for achieving the precision of the wavelength scales of 10−10 or 3.0 cm s−1 necessary to detect Earth-twins in the habitable zone around solar-like stars. Methods. We used a laser frequency comb (LFC) with unresolved and unblended lines to probe the instrument line profile. We injected the LFC light – attenuated by various neutral density filters – into both the object and the reference fibres of HARPS, and we studied the variations of the line profiles with the line intensities. We applied moment analysis to measure the line positions, widths, and skewness as well as to characterize the line profile distortions induced by the spectrograph and detectors. Based on this, we established a model to correct for point spread function distortions by tracking the beam profiles in both fibres. Results. We demonstrate that the line profile varies with the position on the detector and as a function of line intensities. This is consistent with a charge transfer inefficiency effect on the HARPS detector. The estimate of the line position depends critically on the line profile, and therefore a change in the line amplitude effectively changes the measured position of the lines, affecting the stability of the wavelength scale of the instrument. We deduce and apply the correcting functions to re-calibrate and mitigate this effect, reducing it to a level consistent with photon noise.

2021 ◽  
D. Michelle Bailey ◽  
Gang Zhao ◽  
Adam J. Fleisher

<p>Advances in optical technology have led to the commercialization and widespread use of broadband optical frequency combs for multiplexed measurements of trace-gas species. Increasingly available in the mid-infrared spectral region, these devices can be leveraged to interrogate the molecular fingerprint region where many fundamental rovibrational transitions occur. Here we present a cross-dispersed spectrometer employing a virtually imaged phased array etalon and ruled diffraction grating coupled with a difference frequency generation comb centered near 4.5 µm. The spectrometer achieves sub-GHz spectral resolution with a 30 cm<sup>-1</sup> instantaneous bandwidth. Laboratory results for nitrous oxide isotopic abundance retrieval will be presented. Challenges relating to characterizing the instrument lineshape function, constructing a frequency axis traceable to the comb, and accurate spectral modelling will be addressed and progress towards incorporating a more compact laser frequency comb source into the system will be discussed.</p>

Thomas Udem

A laser frequency comb allows the phase coherent conversion of the very rapid oscillations of visible light of some 100s of THz down to frequencies that can be handled with conventional electronics. This capability has enabled the most precise laser spectroscopy experiments yet, which have allowed the testing of quantum electrodynamics, to determine fundamental constants and to construct an optical atomic clock. The chapter reviews the development of the frequency comb, derives its properties, and discusses its application for high resolution spectroscopy of atomic hydrogen.

Sign in / Sign up

Export Citation Format

Share Document