1120-nm Laser Research Articles

2.074- Lasing From Ho3+-Doped Fluorotellurite Microstructured Fibers Pumped by a 1120-nm Laser

We demonstrate 2.074- $\mu \text{m}$ lasing from Ho3+-doped fluorotellurite microstructured fibers (FTMFs) pumped by a 1120-nm Yb3+-doped fiber laser. Ho3+-doped FTMFs based on TeO2–BaF2–Y2O3 glasses are fabricated by using a rod-in-tube method. With increasing the pump power to 253 mW, lasing at 2.074 $\mu \text{m}$ is achieved from a 42-cm-long Ho3+-doped FTMF. With further increasing the pump power to 1015 mW, a maximum unsaturated power of 98 mW is obtained, and the corresponding slope efficiency is up to 12.4%. In addition, relatively strong 1.2- and 2.9- $\mu \text{m}$ emissions are also observed from the Ho3+-doped FTMF.

High-Peak-Power Nanosecond 1120-nm Pulsed Laser Hybrid Pumped by a Self-Pulsed Ytterbium-Doped Fiber MOPA

We report on high-peak-power and nanosecond pulse generation at 1120 nm with a simple all-fiber configuration, which is composed of a 1120-nm linear cavity and a 1064-nm master oscillator power amplifier. The 1120-nm laser is pumped by the self-pulsed ytterbium-doped fiber master oscillator power amplifier configuration, in which the 1064-nm pulse generation is accomplished through the self-gain switching process. The average peak power of 1120-nm pulses is calculated to be about 4.5 kW after the optical filter, and more significantly, the average pulse width at 1120 nm is about 1-2 ns, which is shorter than those reported before.

1.5-kW Yb-Raman Combined Nonlinear Fiber Amplifier at 1120 nm

A high power Yb-Raman combined nonlinear fiber amplifier employing dual-wavelength seed is demonstrated. The amplifier is seeded by 1070- and 1120-nm signal lasers simultaneously. The mechanism of power evolution of the two signals along the gain fiber is analyzed. By careful design and optimization of the amplifier, we make sure the 1120-nm signal extract majority of the gain in the amplifier. In the end, 1.52-kW 1120-nm laser is obtained with an optical efficiency of 75.6%, which is the highest power ever reported near this wavelength. The compact and efficient amplifier scheme proposed in this letter can be employed for high power amplification of 1100-1200-nm lasers.