Title :
Modeling of Cascade Lasing in Dy : Chalcogenide Glass Fiber Laser With Efficient Output at 4.5 μm
Author :
Quimby, R.S. ; Shaw, L.B. ; Sanghera, J.S. ; Aggarwal, I.D.
Author_Institution :
Worcester Polytech. Inst., Worcester
Abstract :
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.
Keywords :
chalcogenide glasses; dysprosium; fibre lasers; laser beams; laser transitions; optical fibre losses; optical pumping; semiconductor lasers; GeAsGaSe:Dy; cascade lasing; continuous-wave chalcogenide glass fiber laser; double-clad fiber geometry; fiber loss; numerical modeling; power scalability; pumping; slope efficiency; wavelength 4.2 mum to 4.7 mum; Bragg gratings; Fiber gratings; Fiber lasers; Glass; Laser modes; Laser transitions; Optical fibers; Pump lasers; Quantum cascade lasers; Remote monitoring; Atmospheric measurements; dysprosium; infrared spectroscopy; modeling; optical fiber lasers; remote sensing;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2007.912541
