Yb3+:YAG silica fiber laser

Area of Science:

• Materials Science
• Optics and Photonics
• Laser Technology

Background:

• Fiber lasers offer advantages in compactness and beam quality.
• Ytterbium-doped materials are crucial for efficient laser operation in the near-infrared spectrum.
• Developing robust, high-performance fiber lasers is essential for scientific and industrial applications.

Purpose of the Study:

• To demonstrate a compact, room-temperature, continuous-wave (cw) Yb(3+):YAG silica fiber laser.
• To characterize the laser's efficiency, spectral properties, and performance metrics.
• To determine key optical parameters like propagation loss and emission cross-section.

Main Methods:

• Fabrication of Yb(3+):YAG silica fiber using the codrawing laser-heated pedestal growth technique.
• Characterization of laser performance, including slope efficiency and output power.
• Spectral analysis to determine side-mode suppression ratio and linewidth.
• Analysis of lasing thresholds and slope efficiencies to derive optical properties.

Main Results:

• Achieved a high slope efficiency of 76.3% from a 7 mm Yb(3+):YAG silica fiber.
• Obtained an extracted power of nearly 1 W/cm.
• Demonstrated a laser side-mode suppression ratio of 70 dB with a 3 dB linewidth of 0.15 nm.
• Quantified propagation loss and emission cross-section through threshold and slope efficiency analysis.

Conclusions:

• The codrawing laser-heated pedestal growth technique is effective for creating high-performance Yb(3+):YAG silica fiber lasers.
• The demonstrated laser exhibits excellent efficiency and spectral stability at room temperature.
• The determined optical parameters provide valuable insights for future fiber laser design and optimization.