Focal Interest
Focal Interest
AI Summary of Peer-Reviewed Research

This page presents an AI-generated summary of a published research paper. The original authors did not write or review this article. [See full disclosure ↓]

Publishing process signals: MODERATE — reflects the venue and review process. — venue and review process.

Pump power tunes wavelength in a Lyot filter

A collection of electronic components including yellow and black cylindrical capacitors, resistors, and diodes with wire leads arranged on a light blue surface, photographed in close-up from above.
Research area:OpticsOptical filterFilter (signal processing)

What the study found

The study found that a pump-induced tunable Lyot filter can be wavelength-tuned by changing the injected pump power. The authors report that the tuning mechanism is mainly caused by thermal effects that change birefringence, the optical property that makes light travel differently along different polarization directions.

Why the authors say this matters

The authors conclude that the filter is an effective choice for wavelength tuning in laser systems. They also show that integrating the filter into a laser ring cavity enabled a single-frequency tunable laser with a narrow linewidth.

What the researchers tested

The researchers studied an optically controlled tunable Lyot filter built from spliced polarization-maintaining ytterbium-doped fiber (PM-YDF) and polarization-maintaining erbium-doped fiber (PM-EDF) with a 90-degree slow-axis offset. They adjusted pump power in the PM-YDF and analyzed how that affected tuning, including the roles of thermal effects and electronic transitions.

What worked and what didn't

Increasing the injected pump power produced wavelength tuning in the filter. The analysis attributed the main tuning effect to birefringence changes in the PM-YDF caused by thermal effects, while the change from electronic transition was about one order of magnitude smaller. In the laser ring cavity, the system produced single-frequency tuning from 1554.7 nm to 1561 nm with a linewidth of 315 Hz.

What to keep in mind

The abstract does not describe detailed limitations or failure cases. The results reported here come from the specific fiber-based filter and laser cavity tested in this study.

Key points

  • Wavelength tuning was achieved by changing pump power in the PM-YDF.
  • Thermal effects were identified as the main cause of birefringence change.
  • Electronic-transition effects were reported to be about one order of magnitude smaller than thermal effects.
  • The PM-EDF was used to expand the filter's free spectral range and as a saturable absorber.
  • A laser ring cavity with the filter produced single-frequency tuning from 1554.7 nm to 1561 nm.
  • The reported linewidth of the tunable laser was 315 Hz.

Disclosure

Research title:
Pump power tunes wavelength in a Lyot filter
Authors:
Rui Cheng, Zhigang Cao, Jiping Lin, Zihan Lin, Jianbo Cao, Yan Lu, Xingyun Wang, Xu Wang, Peng Liu, Yeming Deng, Weihao Guo, Zhong Huang, Zuzhi Fang, Benli Yu
Publication date:
2026-03-09
DOI:
10.1364/oe.589489
OpenAlex record:
View
AI provenance: This post was generated by gpt-5.4-mini (OpenAI). The original authors did not write or review this post.

More posts