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Modeling of Cascade Lasing in Dy : Chalcogenide Glass Fiber Laser With Efficient Output at 4.5 μm

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4 Author(s)
Quimby, R.S. ; Worcester Polytech. Inst., Worcester ; Shaw, L.B. ; Sanghera, J.S. ; Aggarwal, I.D.

The performance of a continuous-wave Dy:GeAsGaSe chalcogenide glass fiber laser operating on the 6H11/2 rarr 6H13/2 transition at 4.2-4.7 mum is studied using numerical modeling. A double-clad fiber geometry is assumed, with direct pumping of the 6H11/2 level at 1.7 mum. It is shown that simultaneous lasing on the 6H13/2 rarr 6H15/2 transition serves to effectively depopulate the 6H11/2 level and significantly improve the efficiency and power scalability. A slope efficiency of 0.16 is calculated when the fiber loss is 1 dB/m. For efficient operation, it is necessary to keep the fiber loss below ap5 dB/m.

Published in:

Photonics Technology Letters, IEEE  (Volume:20 ,  Issue: 2 )