NDLI: Modeling and Optimization of Cascaded Erbium and Holmium Doped Fluoride Fiber Lasers

Content Provider	IEEE Xplore Digital Library
Author	Jianfeng Li Hongyu Luo Yong Liu Lin Zhang Jackson, S.D.
Copyright Year	1995
Abstract	Numerical modeling of cascade erbium-doped and holmium-doped fluoride fiber lasers is presented. Fiber lengths were optimized for cascade lasers that had fixed or free-running wavelengths using all known spectroscopic parameters. The performance of the cascade laser was tested against dopant concentration, energy transfer process, heat generation, output coupling, and pump schemes. The results suggest that the slope efficiencies and thresholds for both transitions increase with increasing Ho³⁺ or Er³⁺ concentration with the slope efficiency stabilizing after 1 mol% rare earth doping. The heat generation in the Ho³⁺ -based system is lower compared to the Er³⁺-based system at low dopant concentration as a result of the lower rates of multiphonon relaxation. Decreasing the output coupling for the upper (~3 μm) transition decreases the threshold of the lower transition and the upper transition benefits from decreasing the output coupling for the lower transition for both cascade systems. The highest slope efficiency was achieved under counter-propagating pump conditions. Saturation of the output power occurs at comparatively higher pump power with dilute Er³⁺ doping compared with heavier doping. Overall, we show that the cascade Ho³⁺-doped fluoride laser is the best candidate for high power output because of its higher slope efficiency and lower temperature excursion of the core and no saturation of the output.
Sponsorship	IEEE Lasers and Electro-Optics Society
Starting Page	15
Ending Page	28
Page Count	14
File Size	1672802
File Format	PDF
ISSN	1077260X
Volume Number	20
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Laser excitation Pump lasers Quantum cascade lasers Laser transitions Laser modes Power lasers Ions mid-infrared Cascade fiber lasers fiber lasers fluoride glass
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Electrical and Electronic Engineering

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