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4.24 μm mid-infrared laser based on a single Fe 2+ -doped ZnSe microcrystal.
Optics Letters 2018 Februrary 2
In this Letter, we report for the first time, to the best of our knowledge, a micron-sized mid-infrared Fe2+ :ZnSe laser based on a single microcrystal. Typical laser emissions centering at 4.24 μm are observed from a selected Fe2+ -doped ZnSe microcrystal under 2.94 μm excitation of Er:YAG laser at room temperature. The laser linewidth is ∼10 nm, the pulse width is ∼50 ns, and the lasing threshold is ∼7.4 mJ/pulse. The lasing wavelength is stable as the pump energy increases and is consistent with the strong absorption position of carbon dioxide in the atmosphere.
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