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Updated: Nov 28, 2025

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Wavelength-Flexible Thulium-Doped Fiber Laser Based on Digital Micromirror Array.

Xiao Chen1, Dezheng Dai1, Yi Zhang1

  • 1College of Science, Minzu University of China, Beijing 100081, China.

Micromachines
|December 1, 2020
PubMed
Summary

A novel thulium-doped fiber laser uses a digital micromirror device (DMD) for precise wavelength tuning. This system achieves stable, fast, and flexible tuning from 1930 nm to 2000 nm with high accuracy.

Keywords:
digital micromirror devicethulium-doped fiber lasertunable laser

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Area of Science:

  • Optics and Photonics
  • Laser Physics
  • Fiber Lasers

Background:

  • Thulium-doped fiber lasers (TDFLs) are crucial for applications in the 2-micron spectral region.
  • Traditional wavelength tuning methods for TDFLs can be complex and limited in flexibility.
  • Digital micromirror devices (DMDs) offer advanced spatial light modulation capabilities.

Purpose of the Study:

  • To demonstrate a wavelength-tunable thulium-doped fiber laser system.
  • To investigate the use of a digital micromirror device (DMD) for flexible wavelength control.
  • To analyze the performance and stability of the proposed laser system.

Main Methods:

  • Integration of a digital micromirror device (DMD) with a fixed grating in a thulium-doped fiber laser cavity.
  • Analysis of DMD diffraction properties and steering efficiency using two-dimensional grating theory.
  • Spatially modulating reflective patterns on the DMD to control the lasing wavelength.

Main Results:

  • Achieved stable, fast, and flexible wavelength tuning of the TDFL from 1930 nm to 2000 nm.
  • Demonstrated a wavelength tuning accuracy of 0.1 nm.
  • Obtained a side-mode suppression ratio greater than 50 dB and a 3 dB linewidth less than 0.05 nm.
  • Exhibited low wavelength drift (<0.05 nm) and power fluctuation (<0.1 dB) within 1 hour at room temperature.

Conclusions:

  • The DMD-based approach provides an effective method for achieving precise and flexible wavelength tuning in TDFLs.
  • The demonstrated laser system offers excellent spectral performance and stability for 2-micron applications.
  • This technology opens new possibilities for tunable laser sources in spectroscopy, sensing, and medical applications.