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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

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Beating the classical limit: a diffraction-limited spectrograph for an arbitrary input beam.

Christopher H Betters, Sergio G Leon-Saval, J Gordon Robertson

|November 13, 2013

Summary

This summary is machine-generated.

We developed a novel fiber-fed spectroscopy method using a photonic lantern. This technique enhances throughput and reduces instrument size and mass for advanced spectral analysis.

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Last Updated: May 6, 2026

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Area of Science:

Optical Engineering
Spectroscopy
Photonics

Background:

Classical fiber-fed spectroscopy faces limitations in throughput and instrument size.
Existing methods often require complex and bulky configurations.

Purpose of the Study:

To introduce a new photonic lantern-based approach for fiber-fed spectroscopy.
To demonstrate improved efficiency, reduced size, and enhanced performance in spectroscopic instruments.

Main Methods:

Utilized a photonic lantern to convert an input beam into multiple diffraction-limited outputs.
Matched the number of outputs to the input spatial modes for maximum throughput.
Constructed the instrument using commercial off-the-shelf components.

Main Results:

Achieved over 60% throughput from slit to detector.
Reduced scattered light at the detector to less than 0.1%.
Demonstrated a spectral resolution of 0.055 nm (R~30,000) in the 1545-1555 nm range.

Conclusions:

The photonic lantern approach offers significant advantages for fiber-fed spectroscopy.
This method enables smaller, lighter, and more efficient spectroscopic instruments.
Represents a foundational step towards integrated, multimode photonic microspectrographs.