Laser frequency comb system for the infrared Doppler spectrograph on the Subaru Telescope

Takuma Serizawa; Takashi Kurokawa; Yosuke Tanaka; Jun Nishikawa; Takayuki Kotani; Motohide Tamura

doi:10.1117/12.2628983

29 August 2022 Laser frequency comb system for the infrared Doppler spectrograph on the Subaru Telescope

Takuma Serizawa, Takashi Kurokawa, Yosuke Tanaka, Jun Nishikawa, Takayuki Kotani, Motohide Tamura

Proceedings Volume 12188, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V; 121885J (2022) https://doi.org/10.1117/12.2628983
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

A near-infrared radial velocity (RV) survey focusing on the late-M dwarfs started in February 2019 within the framework of the Subaru Strategy Program (SSP). The InfraRed Doppler (IRD) instrument mainly consists of a highresolution spectrometer and a laser frequency comb (LFC) system as a wavelength reference. Late-M dwarfs emit most of their energy in the near-infrared rather than in the visible. Therefore, to cover the bright absorption lines of M dwarfs, LFC provides a broadband spectrum from 970 nm to 1750 nm with a mode spacing of 12.5 GHz. It has advantages such as simple and robust frequency stabilization, an all-fiber optic configuration, and being observer friendly. The original comb spectrum just generated from highly nonlinear fibers undergoes optical processing such as spectral shaping, depolarization, and mode scrambling in multimode fiber utilization before it is input to the spectrometer. Using the IRD instrument, the IRD-SSP has made more than 100 nights of observations over the last three years. The LFC system operated stably without major trouble during this period, helping to maintain high RV accuracy. Despite the lack of direct maintenance for two and a half years due to Covid-19, the system has continued to operate without any interruption to the observations.

Conference Presentation

Citation Download Citation

Takuma Serizawa, Takashi Kurokawa, Yosuke Tanaka, Jun Nishikawa, Takayuki Kotani, and Motohide Tamura "Laser frequency comb system for the infrared Doppler spectrograph on the Subaru Telescope", Proc. SPIE 12188, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V, 121885J (29 August 2022); https://doi.org/10.1117/12.2628983

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