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Related Concept Videos

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Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
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A hyperfine-transition-referenced vector spectrum analyzer for visible-light integrated photonics.

Baoqi Shi1,2, Ming-Yang Zheng3,4, Yue Hu2,5

  • 1Department of Optics and Optical Engineering, University of Science and Technology of China, Hefei, 230026, China.

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|July 31, 2025
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This summary is machine-generated.

A new vector spectrum analyzer (VSA) enables precise characterization of visible-light integrated photonics. This breakthrough supports advancements in quantum information, biosensing, and chip-based atomic clocks.

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Area of Science:

  • Integrated photonics
  • Visible-light spectroscopy
  • Quantum technology

Background:

  • Integrated photonics is established in near-infrared (NIR) but faces challenges in the visible spectrum.
  • Visible-light integrated photonics is crucial for biosensing, quantum information, and atomic clocks.
  • High-resolution, wide-coverage characterization techniques for visible light are currently lacking.

Purpose of the Study:

  • To develop and demonstrate a vector spectrum analyzer (VSA) for visible-light integrated photonics.
  • To provide high-frequency resolution and wide spectral coverage for visible light characterization.
  • To enable ubiquitous timing and metrology through chip-based optical systems.

Main Methods:

  • Demonstrated a VSA with spectral bandwidths of 766-795 nm and 518-541 nm.
  • Utilized frequency-doubled, mode-hop-free lasers from NIR sources via CPLN waveguides.
  • Referenced the VSA to alkaline atoms and iodine molecules for megahertz frequency accuracy.

Main Results:

  • Achieved an aggregate characterization bandwidth exceeding one octave across multiple NIR and visible bands.
  • Applied the VSA to characterize passive integrated devices (loss, dispersion, phase response).
  • Showcased characterization of densely spaced spectra from mode-locked lasers.

Conclusions:

  • The developed VSA is a vital diagnostic tool for visible-light integrated photonics.
  • This technology advances spectroscopy, nonlinear optics, imaging, and quantum interfaces.
  • Enables widespread application of precise timing and metrology using chip-based optical systems.