Integrated photonic building blocks for next-generation astronomical instrumentation I: the multimode waveguide

被引：41

作者：

Jovanovic, Nemanja ^{[1
,2
,3
]}

Spaleniak, Izabela ^{[1
,2
]}

Gross, Simon ^{[1
]}

Ireland, Michael ^{[1
,2
,3
]}

Lawrence, Jon S. ^{[1
,2
,3
]}

Miese, Christopher ^{[1
]}

Fuerbach, Alexander ^{[1
]}

Withford, Michael J. ^{[1
,2
]}

机构：

[1] Macquarie Univ, MQ Photon Res Ctr, Dept Phys & Astron, N Ryde, NSW 2109, Australia

[2] Macquarie Univ, Res Ctr Astron Astrophys & Astrophoton, Dept Phys & Astron, N Ryde, NSW 2109, Australia

[3] AAO, Epping, NSW 1710, Australia

来源：

OPTICS EXPRESS | 2012年 / 20卷 / 15期

基金：

澳大利亚研究理事会;

关键词：

FEMTOSECOND LASER; HEAT ACCUMULATION; REPETITION-RATE; REDSHIFT SURVEY; OPTICAL-FIBERS; LIGHT; SPECTROSCOPY; DIFFRACTION; DIFFUSION; LANTERN;

D O I：

10.1364/OE.20.017029

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We report on the fabrication and characterization of composite multimode waveguide structures that consist of a stack of single-mode waveguides fabricated by ultrafast laser inscription. We explore 2 types of composite structures; those that consist of overlapping single-mode waveguides which offer the maximum effective index contrast and non-overlapped structures which support multiple modes via strong evanescent coupling. We demonstrate that both types of waveguides have negligible propagation losses (to within experimental uncertainty) for light injected with focal ratios >8, which corresponds to the cutoff of the waveguides. We also show that right below cutoff, there is a narrow region where the injected focal ratio is preserved (to within experimental uncertainty) at the output. Finally, we outline the major application of these highly efficient waveguides; in a device that is used to reformat the light in the focal plane of a telescope to a slit, in order to feed a diffraction-limited spectrograph. (C) 2012 Optical Society of America

引用

页码：17029 / 17043

页数：15

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