An exoplanet survey with a near-infrared Doppler (IRD) instrument focused on mid-to-late M-type dwarfs began in February 2019 within the framework of the Subaru Strategic Program. Because mid-to-late M-type dwarfs are brighter in the infrared region than in the visible region, a laser frequency comb (LFC) system was developed as a wavelength reference, covering the near-infrared region from 970 to 1750 nm. To stabilize the comb image on the spectrometer, the original 12.5 GHz comb generated using highly nonlinear fibers was injected into the spectrometer after optical processing, including spectral shaping, depolarization, and mode scrambling. An inline fiber module was introduced to enable any optical system configuration for the optical processor. This fiber-optic configuration in the LFC system allows for long-term stability and easy repair. Moreover, simple remote control of the LFC system using an interactive program enabled LFC generation in approximately 5 min, excluding warm-up time. The observations using the IRD instrument over 4 years have proven that our LFC system is practical and stable. The LFC system operated stably without major problems during this period, helping to maintain a high radial velocity accuracy.

中文翻译：

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用于斯巴鲁望远镜红外多普勒仪器的激光频率梳系统

在斯巴鲁战略计划的框架内，于 2019 年 2 月开始使用近红外多普勒 (IRD) 仪器对中晚期 M 型矮星进行系外行星调查。由于中晚期M型矮星在红外区比可见光区更亮，因此开发了激光频率梳（LFC）系统作为波长参考，覆盖970至1750 nm的近红外区。为了稳定光谱仪上的梳状图像，使用高度非线性光纤生成的原始 12.5 GHz 梳状图像经过光学处理（包括光谱整形、去偏振和模式扰乱）后注入光谱仪。引入了内联光纤模块，以实现光学处理器的任何光学系统配置。 LFC 系统中的这种光纤配置可实现长期稳定性且易于维修。此外，使用交互式程序对 LFC 系统进行简单的远程控制，可以在大约 5 分钟内生成 LFC（不包括预热时间）。使用IRD仪器4年多的观察证明，我们的LFC系统是实用且稳定的。在此期间，LFC系统运行稳定，未出现重大问题，有助于保持较高的径向速度精度。