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

2022 ◽  
Vol 151 ◽  
pp. 106938
Author(s):  
Hanzhong Wu ◽  
Panpan Wang ◽  
Peng Hao ◽  
Yuanbo Du ◽  
Yujie Tan ◽  
...  
Keyword(s):  
Time Delay ◽  
Frequency Comb ◽  
Laser Frequency ◽  
Signal Source ◽  
Direct Signal

scholarly journals Controlling and Phase‐Locking a THz Quantum Cascade Laser Frequency Comb by Small Optical Frequency Tuning

2021 ◽  
pp. 2000417
Author(s):  
Luigi Consolino ◽  
Annamaria Campa ◽  
Michele De Regis ◽  
Francesco Cappelli ◽  
Giacomo Scalari ◽  
...  
Keyword(s):  
Quantum Cascade Laser ◽  
Frequency Tuning ◽  
Frequency Comb ◽  
Phase Locking ◽  
Laser Frequency ◽  
Optical Frequency ◽  
Quantum Cascade

Line profile analysis of an astronomical spectrograph with a laser frequency comb

2014 ◽  
Vol 14 (8) ◽  
pp. 1037-1045 ◽  
Author(s):  
Fei Zhao ◽  
Gang Zhao ◽  
Gaspare Lo Curto ◽  
Hui-Juan Wang ◽  
Yu-Juan Liu ◽  
...  
Keyword(s):  
Line Profile ◽  
Profile Analysis ◽  
Frequency Comb ◽  
Laser Frequency ◽  
Line Profile Analysis

scholarly journals Traceability of laser frequency/wavelength calibration through the frequency comb at Inmetro

2016 ◽  
Vol 733 ◽  
pp. 012058 ◽  
Author(s):  
I L M Silva ◽  
I B Couceiro ◽  
M A C Torres ◽  
P A Costa ◽  
H P H Grieneisen
Keyword(s):  
Frequency Comb ◽  
Laser Frequency ◽  
Wavelength Calibration

scholarly journals Self referenced Yb-fiber-laser frequency comb using a dispersion micromanaged tapered holey fiber

2007 ◽  
Vol 15 (19) ◽  
pp. 12161 ◽  
Author(s):  
Parama Pal ◽  
Wayne H. Knox ◽  
Ingmar Hartl ◽  
Martin E. Fermann
Keyword(s):  
Fiber Laser ◽  
Frequency Comb ◽  
Laser Frequency ◽  
Holey Fiber

Y-coupled THz Quantum Cascade Laser Frequency Comb

2021 ◽  
Author(s):  
Urban Senica ◽  
Tudor Olariu ◽  
Paolo Micheletti ◽  
Mattias Beck ◽  
Jérôme Faist ◽  
...  
Keyword(s):  
Quantum Cascade Laser ◽  
Frequency Comb ◽  
Laser Frequency ◽  
Quantum Cascade

scholarly journals Measuring and characterizing the line profile of HARPS with a laser frequency comb

2020 ◽  
Vol 645 ◽  
pp. A23
Author(s):  
F. Zhao ◽  
G. Lo Curto ◽  
L. Pasquini ◽  
J. I. González Hernández ◽  
J. R. De Medeiros ◽  
...  
Keyword(s):  
Line Profile ◽  
Frequency Comb ◽  
Laser Frequency ◽  
Line Intensities ◽  
Measured Position ◽  
Wavelength Scale ◽  
Spectral Line Profile ◽  
The Stability ◽  
A Charge

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.

Precision Mid-Infrared Frequency Comb Spectroscopy using a Cross-Dispersed Spectrometer

2021 ◽  
Author(s):  
D. Michelle Bailey ◽  
Gang Zhao ◽  
Adam J. Fleisher
Keyword(s):  
Frequency Comb ◽  
Difference Frequency Generation ◽  
Laser Frequency ◽  
Trace Gas ◽  
Molecular Fingerprint ◽  
Mid Infrared ◽  
Optical Frequency Combs ◽  
Frequency Combs ◽  
Infrared Spectral ◽  
Fingerprint Region

<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>

Frequency combs and precision spectroscopy of atomic hydrogen

2019 ◽  
pp. 142-215
Author(s):  
Thomas Udem
Keyword(s):  
High Resolution ◽  
Visible Light ◽  
Laser Spectroscopy ◽  
Quantum Electrodynamics ◽  
Atomic Hydrogen ◽  
Frequency Comb ◽  
Atomic Clock ◽  
Laser Frequency ◽  
High Resolution Spectroscopy ◽  
Frequency Combs

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.

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