Multifrequency erbium-doped fiber laser operating at room temperature

Area of Science:

• Photonics and Laser Technology
• Optical Engineering

Background:

• Erbium-doped fiber lasers are crucial for various applications.
• Achieving stable multifrequency lasing at room temperature presents challenges.

Purpose of the Study:

• To propose and demonstrate a novel method for room-temperature multifrequency operation of an erbium-doped fiber laser.
• To achieve simultaneous multiwavelength lasing with narrow spectral spacing.

Main Methods:

• Theoretical proposal and experimental demonstration of a linear laser cavity design.
• Incorporation of a low-frequency shift feedback mechanism using a fiber phase modulator.
• Utilizing an all-polarization-maintaining fiber Sagnac loop as a periodic filter and a single-mode fiber loop as a partial reflector/output port.

Main Results:

• Successful room-temperature operation of the multifrequency erbium-doped fiber laser.
• Experimental demonstration of simultaneous multiwavelength lasing with 0.5 nm wavelength spacing.
• Stabilization of multifrequency lasing by preventing single wavelength steady-state oscillation via a 10 kHz sinusoidal signal.

Conclusions:

• The proposed method effectively enables stable, room-temperature multifrequency lasing in erbium-doped fiber lasers.
• The integrated Sagnac loop and fiber phase modulator provide precise control over lasing characteristics.
• This work offers a viable approach for developing advanced fiber laser sources for diverse applications.