Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Development of a stabilized Fabry–Perot etalonbased calibrator for Hanle echelle spectrograph

Not Accessible

Your library or personal account may give you access

Abstract

Accurate wavelength calibration is an important factor for any measurement with high-resolution spectrographs. The stellar spectrum comprises discrete absorption or emission lines whose position is precisely determined by calibrating the spectrograph using known reference lines generated from laboratory sources. For the spectrograph to measure small variations in Doppler shift, the wavelength calibration must be sufficiently stable during observation time. Instrument instability, mainly due to environmental factors like temperature and pressure variations and limitations of traditional calibration methods, for example, Th–Ar lamps, is the main challenge with high-precision spectroscopy. Through proper environmental control, by maintaining pressure at few mbar and temperature fluctuations within ${\pm}{0.05 ^ \circ}{\rm C}$, Fabry–Perot etalon (FP) can yield a velocity precision of 1–10 m/s when used for wavelength calibration. We have developed a passively stabilized FP-based wavelength calibrator for a Hanle echelle spectrograph (HESP) installed on the Himalayan Chandra Telescope (HCT) at Indian Astronomical Observatory (IAO), Hanle, India. The etalon has been characterized using a Fourier transform spectrograph (FTS), and initial test runs have been performed with HESP. In this paper, we present the design and construction of the instrument along with preliminary test results obtained from HESP.

© 2020 Optical Society of America

Full Article  |  PDF Article
More Like This
Frequency stability of the mode spectrum of broad bandwidth Fabry-Pérot interferometers

Jeff Jennings, Ryan Terrien, Connor Fredrick, Michael Grisham, Mark Notcutt, Samuel Halverson, Suvrath Mahadevan, and Scott A. Diddams
OSA Continuum 3(5) 1177-1193 (2020)

Photonic comb: a stabilized single-mode fiber etalon for wavelength calibration

Christopher H. Betters, Sergio G. Leon-Saval, and Joss Bland-Hawthorn
Appl. Opt. 63(14) D14-D20 (2024)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (19)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Tables (4)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (6)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved