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High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis
Published on: December 22, 2015
一个激光频率,使得辐射速度的测量精度为1厘米s{-1})
Chih-Hao Li1, Andrew J Benedick, Peter Fendel
1Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138, USA.
Nature
|April 4, 2008
概括
天文学家开发了一种新的激光频率,或"astro-comb",以检测较小的系外行星. 这种先进的仪器达到1厘米s(-1) 精度,使得在类似地球的轨道上搜索地球质量的行星.
科学领域:
- 天文学 天文学
- 天体物理学 天体物理学
- 光学工程是指光学工程.
背景情况:
- 探测系外行星依赖于精确测量恒星多普勒位移.
- 目前的方法达到~60厘米/秒的精度,对于大质量行星来说足够了.
- 检测地球质量的行星需要~5厘米s(-1) 精度.
研究的目的:
- 为增强多普勒转移分辨率开发一个光谱仪校准工具.
- 为了达到检测类似地球的系外行星所必需的精度.
主要方法:
- 制造一个过的激光频率和宽线间距 (40 GHz).
- 使用1GHz的重复率源来进行子生成.
- 集成的Fabry-Pérot过腔与激光频率.
主要成果:
- 成功创建了一个带有40 GHz线距的"星际".
- 保持长期稳定性,可重现性和光谱分辨率.
- 证明了1cm s(-1) 射线速度精度的潜力.
结论:
- 天文非常适合用于高分辨率的天体物理谱仪.
- 这项技术显著提升了对系外行星探测的能力.
- 能够搜索潜在可居住的地球质量系外行星.
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