Abstract
Asingle-mode Yb-doped germanophosphosilicate fiber with ultra-low optical losses (less than 2 dB/km) was fabricated by means of the MCVD method utilizing an all-gas-phase deposition technique developed “in house”. The absorption and luminescent spectral properties of the fiber were thoroughly studied. The photosensitivity of the pristine (non-hydrogenated) fiber to 248 nm-laser radiation was confirmed by means of fiber Bragg grating (FBG) inscription directly during the drawing process. The random single-frequency lasing at the 1060-nm-wavelength obtained in the 21-m-long fiber with an array of weak FBG was reported. The developed laser slope efficiency in the backward-pumping scheme was measured as high as 32%.
Highlights
Another undesirable consequence of a high concentration of active ions in a fiber core is the effect of the spontaneous switching of the laser output beam from continuous (CW) to pulsed mode and vice versa, the mechanism of which is associated with up-conversion processes inside ion clusters [5,6]
We reportedarandom single-frequency lasing in the vicinity of 1060 nm wavelength spectral range that was achieved for the first time using a specially developed
The fiber preform was fabricated by means of the MCVD method and by utilizing an original all-gas-phase de0 position technique developed “in house”
Summary
Since intense absorption of pump radiation in a short fiber section occurs, a significant heat release appears in a small glass volume, and stable laser operation of the short cavity must be maintained using external cooling circuits. Another undesirable consequence of a high concentration of active ions in a fiber core is the effect of the spontaneous switching of the laser output beam from continuous (CW) to pulsed mode and vice versa, the mechanism of which is associated with up-conversion processes inside ion clusters [5,6]
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