Source: http://aoot.osa.org/ome/abstract.cfm?uri=ome-7-12-4296
Timestamp: 2019-04-21 14:06:45+00:00

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A sample of Fe:ZnSe fabricated by post-growth thermal diffusion was purchased commercially. The sample was cooled to 80 K using liquid nitrogen and used as the gain element in a Watt-class continuous-wave laser with an output wavelength centered at 4050 nm. The sample was removed from the laser and treated using a hot isostatic press (HIP) technique. The crystal was then re-placed in the laser resonator. After the HIP treatment, and with no other changes to the laser resonator, the slope efficiency of the laser increased by 1.5×. The spectral output was red-shifted to 4122 nm and the output linewidth was narrowed by nearly two orders of magnitude, resulting in a 36× increase in power spectral density. The shift in wavelength and the increase in power scaling performance is consistent with the activation of previously inactive iron impurities in the sample by the HIP treatment.
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Fig. 1 The corrected absorption and emission cross-sections of an Fe:ZnSe sample at 80 K.
Fig. 2 The experimental configuration of the Fe:ZnSe laser. All optics were made of CaF2.
Fig. 3 The slope-efficiency of the laser before (blue triangles) and after (red circles) the Fe:ZnSe sample was HIP treated. The threshold values were extrapolated because the pump laser could not be operated at lower powers without becoming unstable. Error bars are smaller than the data markers.
Fig. 4 The spectral power density of the Fe:ZnSe before (blue) and after (red) the sample was HIP treated. The two curves are also inset and rescaled for clarity. The linewidth measurements were recorded at approximately 5× the lasing threshold power in each case.
Fig. 5 The spectral absorption coefficient of two types of Fe:ZnSe at 11.5 K. The inset shows two smaller absorption features in more detail. Note that the Γ5 → γ1 transition line of the HIP sample is saturated and the plots are normalized to the Γ5 → γ4 transition.

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