10 W widely tunable narrow linewidth double-clad fiber ring laser

Area of Science:

• * Photonics and Laser Technology
• * Fiber Optics
• * Spectroscopic Applications

Background:

• * Development of efficient and tunable fiber lasers is crucial for various scientific and industrial applications.
• * Ytterbium-doped fiber lasers offer advantages in the 1-micron wavelength range.
• * Achieving narrow linewidths and high output power simultaneously presents a significant challenge.

Purpose of the Study:

• * To demonstrate a highly efficient and widely tunable ytterbium-doped double-clad fiber laser.
• * To achieve a narrow linewidth and high linearly polarized output power.
• * To explore an operating mode with suppressed amplified spontaneous emission.

Main Methods:

• * Employed a unidirectional ring-cavity configuration.
• * Utilized a diffraction-grating pair in a Littrow-Littman configuration for wavelength tuning.
• * Characterized laser output power, wavelength tunability, linewidth, and amplified spontaneous emission.

Main Results:

• * Demonstrated a linearly polarized output power of 10 W.
• * Achieved wavelength tunability over a 24 THz range (1032 nm to 1124 nm).
• * Maintained a laser linewidth smaller than 2.5 GHz across all tested conditions.
• * Realized an operating mode with suppressed amplified spontaneous emission and up to 3 W output power.

Conclusions:

• * The developed fiber laser is highly efficient and widely tunable with a narrow linewidth.
• * The Littrow-Littman configuration effectively enables broad wavelength tuning.
• * The laser system shows potential for applications requiring high-power, narrow-linewidth, tunable light sources.