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Writing Bragg Gratings in Multicore Fibers
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Developing arrayed waveguide grating spectrographs for multi-object astronomical spectroscopy.

Nick Cvetojevic1, Nemanja Jovanovic, Jon Lawrence

  • 1MQ Photonics Research Centre, Department of Physics and Astronomy, Macquarie University, NSW 2109, Australia. nick.cvetojevic@mq.edu.au

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Summary
This summary is machine-generated.

Researchers enhanced arrayed waveguide gratings for astronomical spectroscopy by modifying telecommunications chips. This modification significantly boosts resolving power and enables simultaneous multi-fiber injection, improving observing efficiency for astronomical surveys.

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Area of Science:

  • Astronomy
  • Optical Engineering

Background:

  • Arrayed waveguide gratings (AWGs) are crucial for multi-object spectroscopy.
  • Standard telecommunications-grade AWG chips have limitations for astronomical applications.

Purpose of the Study:

  • To modify telecommunications-grade AWG chips for enhanced astronomical spectroscopy.
  • To improve resolving power and observing efficiency in astronomical instruments.

Main Methods:

  • Removing the parabolic-horn taper or multimode interference coupler from standard AWG chips.
  • Direct optical fiber injection into the modified AWG chips.
  • Evaluating simultaneous off-axis injection from multiple fibers.

Main Results:

  • Achieved a threefold increase in resolving power, from 2400 ± 200 to 7000 ± 700.
  • Maintained a high throughput of 77 ± 5%.
  • Enabled simultaneous injection from approximately 12 fibers with minimal loss in resolving power.

Conclusions:

  • Modified AWG chips offer superior performance for astronomical multi-object spectroscopy.
  • The modifications significantly enhance observing efficiency by enabling simultaneous multi-fiber spectroscopy.
  • This approach provides a cost-effective solution for advanced astronomical instrumentation.