标题： 基于光学频率梳的新一代光谱仪校准技术 显示英文标题

标题： A new Generation of Spectrometer Calibration Techniques based on Optical Frequency Combs

摘要： 典型的天文学光谱仪的分辨率范围在几百到200,000之间。 去卷积和相关技术被用于达到像素的千分之一的显著性。 HeAr和ThAr灯通常分别用于低分辨率和高分辨率光谱学的校准。 不幸的是，发射的线条通常只覆盖光谱仪光谱范围的一小部分。 此外，它们的确切位置强烈依赖于环境条件。 一个问题是在不同线条之间的强度变化很大（强度比大于300）。 此外，灯的亮度不足以通过积分球照亮光谱仪，而积分球对于校准长狭缝光谱仪是重要的，因为这是确保光谱仪孔径均匀照明的唯一方法。 实验室精密激光光谱学随着飞秒脉冲激光产生的光学频率梳的发展取得了重大进展。 这些激光发射一个宽谱（可见光和近红外区域几百年纳米）的等间距“梳”线，几乎具有均匀的强度（强度比通常小于10）。 激光的自参考建立了一个精确的频率空间量尺，可以稳定到10e-18的不确定度水平，在使用全球定位系统（GPS）的时间信号作为参考时，每天的绝对频率不准确度达到10e-12的水平。 探索这种新技术的优点有望实现宽带、高度准确和可重复的校准，这对于当前和下一代天文光谱仪的可靠运行是必要的。 显示英文摘要

摘要： Typical astronomical spectrographs have a resolution ranging between a few hundred to 200.000. Deconvolution and correlation techniques are being employed with a significance down to 1/1000 th of a pixel. HeAr and ThAr lamps are usually used for calibration in low and high resolution spectroscopy, respectively. Unfortunately, the emitted lines typically cover only a small fraction of the spectrometer's spectral range. Furthermore, their exact position depends strongly on environmental conditions. A problem is the strong intensity variation between different (intensity ratios {>300). In addition, the brightness of the lamps is insufficient to illuminate a spectrograph via an integrating sphere, which in turn is important to calibrate a long-slit spectrograph, as this is the only way to assure a uniform illumination of the spectrograph pupil. Laboratory precision laser spectroscopy has experienced a major advance with the development of optical frequency combs generated by pulsed femto-second lasers. These lasers emit a broad spectrum (several hundred nanometers in the visible and near infra-red) of equally-spaced "comb" lines with almost uniform intensity (intensity ratios typically <10). Self-referencing of the laser establishes a precise ruler in frequency space that can be stabilized to the 10e-18 uncertainty level, reaching absolute frequency inaccuracies at the 10e-12 level per day when using the Global Positioning System's (GPS) time signal as the reference. The exploration of the merits of this new technology holds the promise for broad-band, highly accurate and reproducible calibration required for reliable operation of current and next generation astronomic spectrometers.