Design and implementation of a fiber-fed Fourier transform spectrograph for astronomical applications

Pornapa Artsang; Christophe Buisset; Pakakaew Rittipruk; Sirinrat Sithajan; Supachai Awiphan; Boonrucksar Soonthornthum; Saran Poshyachinda; Panomsak Meemon

doi:10.1117/12.2642986

3 October 2022 Design and implementation of a fiber-fed Fourier transform spectrograph for astronomical applications

Pornapa Artsang, Christophe Buisset, Pakakaew Rittipruk, Sirinrat Sithajan, Supachai Awiphan, Boonrucksar Soonthornthum, Saran Poshyachinda, Panomsak Meemon

Author Affiliations +

Proceedings Volume 12223, Interferometry XXI; 122230S (2022) https://doi.org/10.1117/12.2642986
Event: SPIE Optical Engineering + Applications, 2022, San Diego, California, United States

Conference Poster

Abstract

The Fourier transform spectrograph (FTS) is one important tool that has been used to analyze and characterize the radiated energy distribution of the stellar objects through an atmosphere. Most of the current spectrographs were installed at the telescope focal plane of the telescope, which required the space and complexity of alignments. The implementation of a fiber to feed the light from the telescope has been implemented to overcome those limitations. However, a small flux due to the single point field of view becomes a main challenge of this system. In this work, we report the development of the laboratory prototype of a fiber-fed FTS by using off-the-shelf components specifically designed for the Thai National Telescope (TNT). The method used to process the data relies on the cubic spline interpolation for resampling of both scientific and metrology interferograms and producing the spectrum from the raw measurements. The current maximum optical path difference is about 30 mm with an achievable spectral resolving power higher than 19,000 based on the instrument line shape of the system. The results obtained by concentrating the Sun light with the signal-to-noise-ratio (SNR) greater than 20 are presented. We also present the preliminary results of the low flux detection from a dim halogentungsten source comparable to the magnitude of a bright star in the order of a few nano-watts. The implementation of a phase-lock amplifier has been investigated to detect the signal and improve the signal-to-noise-ratio of the spectrum.

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Pornapa Artsang, Christophe Buisset, Pakakaew Rittipruk, Sirinrat Sithajan, Supachai Awiphan, Boonrucksar Soonthornthum, Saran Poshyachinda, and Panomsak Meemon "Design and implementation of a fiber-fed Fourier transform spectrograph for astronomical applications", Proc. SPIE 12223, Interferometry XXI, 122230S (3 October 2022); https://doi.org/10.1117/12.2642986

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