Laser Frequency Combs for Astronomical Observations
Laser Frequency Combs for Astronomical Observations
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DOI：
10.1126/s
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发表时间：
2008-09
期刊：
影响因子：
56.9
通讯作者：
T. Steinmetz;T. Wilken;C. Araujo-Hauck;R. Holzwarth;T. Hänsch;L. Pasquini;A. Manescau;S. D’odorico-S.-D’odoric
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文献类型：
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作者：
T. Steinmetz;T. Wilken;C. Araujo-Hauck;R. Holzwarth;T. Hänsch;L. Pasquini;A. Manescau;S. D’odorico-S.-D’odoric
宇宙膨胀历史的直接测量可以通过观测遥远天体的宇宙学红移的真实的演化来实现。然而，这将需要测量多普勒速度漂移为每年每秒2.1厘米，天文摄谱仪尚未校准到这个公差。我们演示了第一次使用激光频率梳的波长校准的天文望远镜。即使是简单的分析，绝对校准是实现了一个等效的多普勒精度为每秒1.9米，1.5微米-超过国家的最先进的精度。我们表明，跟踪复杂的，随时间变化的光谱仪和检测器系统的系统效应是激光频率梳校准的一个特殊优势。这种技术有望成为一种有效的手段，用于建模和消除这种系统性影响，以达到未来实验所需的精度，从而看到宇宙假定加速的直接证据。
A direct measurement of the universe's expansion history could be made by observing in real time the evolution of the cosmological redshift of distant objects. However, this would require measurements of Doppler velocity drifts of ∼1 centimeter per second per year, and astronomical spectrographs have not yet been calibrated to this tolerance. We demonstrated the first use of a laser frequency comb for wavelength calibration of an astronomical telescope. Even with a simple analysis, absolute calibration is achieved with an equivalent Doppler precision of ∼9 meters per second at ∼1.5 micrometers—beyond state-of-the-art accuracy. We show that tracking complex, time-varying systematic effects in the spectrograph and detector system is a particular advantage of laser frequency comb calibration. This technique promises an effective means for modeling and removal of such systematic effects to the accuracy required by future experiments to see direct evidence of the universe's putative acceleration.