Single-frequency fiber laser at 880 nm.

Area of Science:

• Photonics and Laser Technology
• Materials Science
• Quantum Optics

Background:

• Single-frequency fiber lasers are crucial for scientific and practical applications due to their low noise and narrow spectral linewidth.
• There is a continuous demand for developing fiber lasers that operate at novel wavelengths.
• Neodymium (Nd3+)-doped materials are well-established gain media for fiber lasers.

Purpose of the Study:

• To demonstrate a novel single-frequency fiber laser operating at an unprecedentedly short wavelength.
• To investigate the performance characteristics of a neodymium-doped phosphate fiber laser at 880 nm.
• To explore methods for enhancing laser output power and efficiency through material optimization.

Main Methods:

• Fabrication of a short (2.5 cm) Nd3+-doped phosphate fiber.
• Characterization of the fiber laser's performance, including output power and slope efficiency.
• Computational modeling to predict performance with varying dopant concentrations and mitigate ion clustering.

Main Results:

• Achieved operation of a single-frequency fiber laser at 880 nm, the shortest wavelength reported to date.
• Obtained an output power of 44.5 mW with a slope efficiency of 20.4% (with respect to absorbed pump power).
• Simulation indicated potential for higher output power using 1.5 wt.% or 2 wt.% Nd3+-doped fiber with reduced ion clustering.

Conclusions:

• Successfully demonstrated the shortest wavelength single-frequency fiber laser using Nd3+-doped phosphate fiber.
• The 880 nm laser shows promising performance metrics for potential applications.
• Optimizing Nd3+ concentration and mitigating ion clustering are key strategies for future performance improvements.