Single-frequency gain-switched Ho-doped fiber laser.

Area of Science:

• Fiber laser technology
• Laser physics
• Nonlinear optics

Background:

• Holmium-doped fiber lasers are crucial for various applications, including remote sensing.
• Achieving single-frequency, high-power output from these lasers presents significant challenges.
• Existing methods often lack efficiency or require complex setups.

Purpose of the Study:

• To demonstrate a novel single-frequency gain-switched holmium-doped fiber laser.
• To investigate the amplification of these pulses in a thulium-holmium codoped fiber amplifier.
• To explore nonlinear effects in high-power fiber amplifiers.

Main Methods:

• Fabrication of a heavily doped silicate glass fiber.
• In-band pumping of the holmium-doped fiber laser using a Q-switched thulium-doped fiber laser.
• Amplification of single-frequency pulses in a cladding-pumped thulium-holmium codoped fiber amplifier.
• Analysis of nonlinear effects like modulation instability and stimulated Brillouin scattering.

Main Results:

• Successful demonstration of a single-frequency gain-switched holmium-doped fiber laser operating at 2.05 μm.
• Amplification of output pulses in a codoped fiber amplifier.
• Observation of nonlinear effects (modulation instability, stimulated Brillouin scattering) at peak powers exceeding 3 kW in the 10 μm-core fiber amplifier.
• This work represents the first demonstration of this specific fiber laser configuration.

Conclusions:

• The developed fiber laser system offers a promising solution for Doppler lidar applications.
• The study provides insights into nonlinear phenomena in high-power fiber amplifiers.
• This novel approach advances the capabilities of holmium-doped fiber lasers.