We present the design of a compact absolute optical frequency reference for space applications based on hyperfine transitions in molecular iodine with a targeted fractional frequency instability of better than 3 × 10−14 after 1 s. It is based on a micro-integrated extended cavity diode laser with integrated optical amplifier, fiber pigtailed second harmonic generation wave-guide modules, and a quasi-monolithic spectroscopy setup with operating electronics. The instrument described here is scheduled for launch end of 2017 aboard the TEXUS 54 sounding rocket as an important qualification step towards space application of iodine frequency references and related technologies. The payload will operate autonomously and its optical frequency will be compared to an optical frequency comb during its space flight.

中文翻译：

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JOKARUS-用于探空火箭任务的紧凑型光学碘频率参考的设计

我们提出了一种基于分子碘的超精细跃迁的紧凑型绝对光学频率参考设计，用于空间应用，其目标分数频率不稳定性在1 s后优于3×10-14。它基于带集成光放大器的微集成扩展腔二极管激光器，光纤尾纤二次谐波生成波导模块以及带有工作电子器件的准单片光谱仪。此处描述的仪器定于2017年末在TEXUS 54探空火箭上发射，这是朝着碘频率参考和相关技术在太空应用的重要鉴定步骤。有效载荷将自主运行，其光频率将在其太空飞行期间与光频率梳进行比较。