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Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography

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Dark-line laser.

Bao-Dong To, Ming-Hsiung Wu, Yen-Chieh Huang

|December 1, 2020

Summary

This summary is machine-generated.

Researchers developed a novel ytterbium-doped fiber laser that emits a "dark line" at a specific wavelength. This laser technology enables precise wavelength tuning and multicolor emission by introducing a 150 µm thick etalon mirror.

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Area of Science:

Optics and Photonics
Laser Physics
Materials Science

Background:

Lasers typically emit coherent radiation at a specific wavelength.
Controlling laser emission at precise wavelengths is crucial for various applications.
Existing methods for controlling laser emission can be complex or limited in scope.

Purpose of the Study:

To demonstrate a laser capable of suppressing emission at a particular wavelength.
To investigate the generation of a 'dark line' within a laser's gain spectrum.
To explore wavelength tuning and multicolor emission using this novel laser design.

Main Methods:

An etalon mirror (150 µm thick) was integrated into an ytterbium-doped fiber laser.
The etalon introduced a 100% loss at its resonant frequency.
The laser's gain spectrum was analyzed to observe the effect of the etalon.

Main Results:

A distinct 'dark line' was successfully generated in the laser's emission spectrum.
The etalon's resonance effectively suppressed laser emission at a specific wavelength.
The laser exhibited wavelength tunability and the capability for multicolor emission.

Conclusions:

The integration of an etalon mirror provides a method to create a 'dark line' in fiber laser emission.
The interplay between etalon resonance, gain broadening, and gain competition enables versatile laser output.
This technique offers a new approach for controlling and tuning laser wavelengths.