Laser-frequency-comb calibration for the Extremely Large Telescope: an OPO-based infrared astrocomb covering the H and J bands

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)
10 Downloads (Pure)

Abstract

The Extremely Large Telescope (ELT) will address an unprecedented optical wavelength range from 370 to 2400 nm, and its high-resolution spectrograph (HIRES) will require a laser frequency comb calibrator of comparable coverage. An architecture based around a Ti:sapphire master comb in principle enables wavelengths across this range to be obtained by a combination of second-and third-order nonlinear effects. In this scheme, near-infrared wavelength coverage can be addressed by downconversion of the comb to 1600 nm using an optical parametric oscillator (OPO), followed by broadband supercontinuum generation in highly nonlinear fiber. Here we present an example of this approach in the form of a 10 GHz astrocomb comprising a Fabry Perot-filtered supercontinuum derived from a degenerate OPO and spanning 1.15 1.80 m. We characterize the astrocomb using Fourier-Transformspectroscopy, enabling the mode orders within the filtered comb to be identified.

Original languageEnglish
Pages (from-to)A15-A20
Number of pages6
JournalJournal of the Optical Society of America B: Optical Physics
Volume38
Issue number7
Early online date24 Feb 2021
DOIs
Publication statusPublished - 1 Jul 2021

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Atomic and Molecular Physics, and Optics

Fingerprint

Dive into the research topics of 'Laser-frequency-comb calibration for the Extremely Large Telescope: an OPO-based infrared astrocomb covering the H and J bands'. Together they form a unique fingerprint.

Cite this