Abstract
We report here a high-power, wavelength tunable and narrow linewidth $1.5~\unicode[STIX]{x03BC}\text{m}$ all-fiber laser amplifier based on a tunable diode laser and Er-Yb co-doped fibers. The laser wavelength can be precisely tuned from 1535 nm to 1580 nm, which covers many absorption lines of mid-infrared laser gases, such as $\text{C}_{2}\text{H}_{2}$, HCN, CO, and HI. The maximum laser power is ${>}$11 W, and the linewidth is about 200–300 MHz, which is close to the absorption linewidth of the above-mentioned gases. This work provides a suitable pump source for high-power wavelength tunable mid-infrared fiber gas lasers based on low-loss hollow-core fibers.
Highlights
1.5 μm tunable narrow linewidth fiber laser sources have attracted considerable interest for their broad applications in optical communications, fiber sensors, coherent combination, fiber radar, and so on[1,2,3]
We characterize the properties of a highpower, wavelength tunable and narrow linewidth 1.5 μm band all-fiber laser amplifier, consisting of a precisely wavelength tunable diode laser, an Er-doped fiber pre-amplifier and an Er-Yb co-doped fiber (EYDF) power amplifier
The maximum laser power is >11 W, and the linewidth is about 200–300 MHz, which is close to the absorption linewidth of most gases at C-band
Summary
1.5 μm tunable narrow linewidth fiber laser sources have attracted considerable interest for their broad applications in optical communications, fiber sensors, coherent combination, fiber radar, and so on[1,2,3]. Mid-infrared fiber gas lasers have attracted intensive attention[10,11,12,13], and the preferable pump sources are precisely tunable C-band fiber lasers with several hundreds of megahertz linewidth (matching the absorption linewidth of gas molecules such as 12C2H2) and at least several hundreds of mW (the usual laser threshold). We demonstrated a watt-level tunable 1.5 μm narrow linewidth fiber ring laser using a temperature tuning π -phase shifted fiber Bragg grating, with maximum power of 1.1 W and linewidth of 318 MHz[14]; the wavelength tuning range is only 1.29 nm, which cannot meet the requirements of tunable mid-infrared fiber gas lasers. This work can provide preferable pump sources for fiber gas lasers based on hollow-core fibers[10,11,12,13]
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