An RIZ-Band Astrocomb with Versatile Offset Control

Kamalesh Dadi; Yuk Shan Cheng; William Newman; Jake M. Charsley; Richard Alexander McCracken; Derryck Telford Reid

doi:10.1109/cleo/europe-eqec65582.2025.11109141

An RIZ-Band Astrocomb with Versatile Offset Control

Kamalesh Dadi, Yuk Shan Cheng, William Newman, Jake M. Charsley, Richard Alexander McCracken, Derryck Telford Reid

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

Laser frequency combs (LFCs) offer ideal calibration lines for astronomical spectrographs, enabling extreme precision radial velocity (RV) measurements down to 10 cm s−1 [1]. Inhomogeneities in the spectrograph camera, which are not fully mapped by a static field of astrocomb modes, introduce errors into the instrument point spread function (PSF), which in turn translate into RV errors. One approach to mitigating this issue is to leverage the narrow LFC lines for mapping the complete detector PSF [2], [3]. This can be achieved by an astrocomb with a tunable mode offset, allowing the comb modes to be swept across all the detector pixels [4]. In this work, we present an offset-tunable astrocomb in the RIZ band, featuring a compact Fabry-Pérot (FP) design, and offering hands-free tunability and robust filtering.

Original language	English
Title of host publication	2025 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)
Publisher	IEEE
ISBN (Electronic)	9798331512521
ISBN (Print)	9798331512538
DOIs	https://doi.org/10.1109/cleo/europe-eqec65582.2025.11109141
Publication status	Published - 15 Aug 2025
Event	2025 Conference on Lasers and Electro-Optics/Europe - Munich, Munich , Germany Duration: 23 Jun 2025 → 27 Jun 2025 https://www.cleoeurope.org/

Conference

Conference	2025 Conference on Lasers and Electro-Optics/Europe
Abbreviated title	CLEO EUROPE 2025
Country/Territory	Germany
City	Munich
Period	23/06/25 → 27/06/25
Internet address	https://www.cleoeurope.org/

Keywords

Filtering
Instruments
Measurement by laser beams
Europe
Detectors
Nonhomogeneous media
Laser modes
Extraterrestrial measurements
Frequency measurement
Velocity measurement

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Instrumentation
Atomic and Molecular Physics, and Optics

Access to Document

10.1109/cleo/europe-eqec65582.2025.11109141

Cite this

@inproceedings{969da7d8ed824afea148ef9294742cfd,

title = "An RIZ-Band Astrocomb with Versatile Offset Control",

abstract = "Laser frequency combs (LFCs) offer ideal calibration lines for astronomical spectrographs, enabling extreme precision radial velocity (RV) measurements down to 10 cm s−1 [1]. Inhomogeneities in the spectrograph camera, which are not fully mapped by a static field of astrocomb modes, introduce errors into the instrument point spread function (PSF), which in turn translate into RV errors. One approach to mitigating this issue is to leverage the narrow LFC lines for mapping the complete detector PSF [2], [3]. This can be achieved by an astrocomb with a tunable mode offset, allowing the comb modes to be swept across all the detector pixels [4]. In this work, we present an offset-tunable astrocomb in the RIZ band, featuring a compact Fabry-P{\'e}rot (FP) design, and offering hands-free tunability and robust filtering.",

keywords = "Filtering, Instruments, Measurement by laser beams, Europe, Detectors, Nonhomogeneous media, Laser modes, Extraterrestrial measurements, Frequency measurement, Velocity measurement",

author = "Kamalesh Dadi and Cheng, \{Yuk Shan\} and William Newman and Charsley, \{Jake M.\} and McCracken, \{Richard Alexander\} and Reid, \{Derryck Telford\}",

year = "2025",

month = aug,

day = "15",

doi = "10.1109/cleo/europe-eqec65582.2025.11109141",

language = "English",

isbn = "9798331512538",

booktitle = "2025 Conference on Lasers and Electro-Optics Europe \& European Quantum Electronics Conference (CLEO/Europe-EQEC)",

publisher = "IEEE",

address = "United States",

note = "2025 Conference on Lasers and Electro-Optics/Europe, CLEO EUROPE 2025 ; Conference date: 23-06-2025 Through 27-06-2025",

url = "https://www.cleoeurope.org/",

}

Dadi, K, Cheng, YS, Newman, W, Charsley, JM, McCracken, RA & Reid, DT 2025, An RIZ-Band Astrocomb with Versatile Offset Control. in 2025 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)., 11109141, IEEE, 2025 Conference on Lasers and Electro-Optics/Europe, Munich , Germany, 23/06/25. https://doi.org/10.1109/cleo/europe-eqec65582.2025.11109141

TY - GEN

T1 - An RIZ-Band Astrocomb with Versatile Offset Control

AU - Dadi, Kamalesh

AU - Cheng, Yuk Shan

AU - Newman, William

AU - Charsley, Jake M.

AU - McCracken, Richard Alexander

AU - Reid, Derryck Telford

PY - 2025/8/15

Y1 - 2025/8/15

N2 - Laser frequency combs (LFCs) offer ideal calibration lines for astronomical spectrographs, enabling extreme precision radial velocity (RV) measurements down to 10 cm s−1 [1]. Inhomogeneities in the spectrograph camera, which are not fully mapped by a static field of astrocomb modes, introduce errors into the instrument point spread function (PSF), which in turn translate into RV errors. One approach to mitigating this issue is to leverage the narrow LFC lines for mapping the complete detector PSF [2], [3]. This can be achieved by an astrocomb with a tunable mode offset, allowing the comb modes to be swept across all the detector pixels [4]. In this work, we present an offset-tunable astrocomb in the RIZ band, featuring a compact Fabry-Pérot (FP) design, and offering hands-free tunability and robust filtering.

AB - Laser frequency combs (LFCs) offer ideal calibration lines for astronomical spectrographs, enabling extreme precision radial velocity (RV) measurements down to 10 cm s−1 [1]. Inhomogeneities in the spectrograph camera, which are not fully mapped by a static field of astrocomb modes, introduce errors into the instrument point spread function (PSF), which in turn translate into RV errors. One approach to mitigating this issue is to leverage the narrow LFC lines for mapping the complete detector PSF [2], [3]. This can be achieved by an astrocomb with a tunable mode offset, allowing the comb modes to be swept across all the detector pixels [4]. In this work, we present an offset-tunable astrocomb in the RIZ band, featuring a compact Fabry-Pérot (FP) design, and offering hands-free tunability and robust filtering.

KW - Filtering

KW - Instruments

KW - Measurement by laser beams

KW - Europe

KW - Detectors

KW - Nonhomogeneous media

KW - Laser modes

KW - Extraterrestrial measurements

KW - Frequency measurement

KW - Velocity measurement

UR - https://www.scopus.com/pages/publications/105016230344

U2 - 10.1109/cleo/europe-eqec65582.2025.11109141

DO - 10.1109/cleo/europe-eqec65582.2025.11109141

M3 - Conference contribution

SN - 9798331512538

BT - 2025 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)

PB - IEEE

T2 - 2025 Conference on Lasers and Electro-Optics/Europe

Y2 - 23 June 2025 through 27 June 2025

ER -

An RIZ-Band Astrocomb with Versatile Offset Control

Abstract

Conference

Keywords

ASJC Scopus subject areas

Access to Document

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