Efficient photonic reformatting of celestial light for diffraction-limited spectroscopy
Efficient photonic reformatting of celestial light for diffraction-limited spectroscopy
复制标题
用于衍射极限光谱的天体光的高效光子重新格式化
DOI：
10.1093/mnras/stw2558
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发表时间：
2017
影响因子：
4.8
通讯作者：
MacLachlan D
中科院分区：
文献类型：
--
作者：
MacLachlan D
色散天文光谱仪的光谱分辨率受到吞吐量和入射狭缝宽度之间权衡的限制。光子导波跃迁被认为是一种绕过这种权衡的途径，它能够将望远镜收集的非相干视界光有效地重新格式化成单模的线性阵列：在一个轴上高度多模但在光谱仪的色散轴上受衍射限制的伪狭缝。预计，以这种方式馈送光的单目标光谱仪的大小基本上与望远镜孔径大小无关。另一个预期的好处是，这种光谱仪将不会出现模式噪声，这是由于望远镜点扩展函数(PSF)的相干性质而在高分辨率多模光纤馈电光谱仪中出现的现象。我们试图通过将多核光纤光子灯与超快激光内切三维波导互连相结合来解决这些方面的问题，从而将PSF内的模式重新格式化为衍射限制的伪狭缝。使用威廉·赫歇尔望远镜上的金丝雀自适应光学(AO)演示器和1530微米±880微米的恒星光，该设备的透过率为47%-53%，具体取决于所应用的AO校正模式。我们还展示了使用声光耦合到这样一个设备的优势，只采样金丝雀PSF的核心。这一结果强调了一种完全优化的导波装置可以与声光一起使用的可能性，以提供高光谱分辨率的高效光谱。
The spectral resolution of a dispersive astronomical spectrograph is limited by the trade-off between throughput and the width of the entrance slit. Photonic guided wave transitions have been proposed as a route to bypass this trade-off, by enabling the efficient reformatting of incoherent seeing-limited light collected by the telescope into a linear array of single modes: a pseudo-slit which is highly multimode in one axis but diffraction-limited in the dispersion axis of the spectrograph. It is anticipated that the size of a single-object spectrograph fed with light in this manner would be essentially independent of the telescope aperture size. A further anticipated benefit is that such spectrographs would be free of ‘modal noise’, a phenomenon that occurs in high-resolution multimode fibre-fed spectrographs due to the coherent nature of the telescope point spread function (PSF). We seek to address these aspects by integrating a multicore fibre photonic lantern with an ultrafast laser inscribed three-dimensional waveguide interconnect to spatially reformat the modes within the PSF into a diffraction-limited pseudo-slit. Using the CANARY adaptive optics (AO) demonstrator on the William Herschel Telescope, and 1530 ± 80 nm stellar light, the device exhibits a transmission of 47–53 per cent depending upon the mode of AO correction applied. We also show the advantage of using AO to couple light into such a device by sampling only the core of the CANARY PSF. This result underscores the possibility that a fully optimized guided-wave device can be used with AO to provide efficient spectroscopy at high spectral resolution.
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DOI：
10.1017/9781108777919.010
发表时间：
2010
期刊：
Advances in Experimental Political Science
影响因子：
--
作者：
A. Reinhorn
通讯作者：
A. Reinhorn
单模光纤中的“模态噪声”：高精度径向速度仪器的警告
DOI：
--
发表时间：
2015
期刊：
影响因子：
--
作者：
S. Halverson;Arpita Roy;S. Mahadevan;C. Schwab
通讯作者：
C. Schwab
DOI：
--
发表时间：
2010-07
期刊：
--
影响因子：
--
作者：
Ian S. McLean;Suzanne K. Ramsay;Hideki Takami
通讯作者：
Ian S. McLean;Suzanne K. Ramsay;Hideki Takami
影响因子：
27.1
作者：
Birks, T. A.;Gris-Sanchez, I.;Thomson, R. R.
通讯作者：
Thomson, R. R.
集成光子摄谱仪在天文学中的应用
DOI：
--
发表时间：
2012
期刊：
影响因子：
--
作者：
Robert J. Harris;J. Allington
通讯作者：
J. Allington