Understanding the fiber tip thermal runaway present in 3 µm fluoride glass fiber lasers.

When the tip of a fluoride glass fiber is exposed to ambient air, water vapor reacts with the glass constituents, increasing the OH contaminants at the surface. These OH impurities then diffuse inside the glass according to Fick's laws. Laser radiation at around 3 µm is strongly absorbed by the OH contaminants, causing local heating of the fiber tip resulting in an increase of the diffusion process which ultimately leads to fiber tip destruction. We accurately model this phenomenon by combining the diffusion theory with a basic thermal equation. Experimental measurements are in agreement with the model predictions for a good range of operating conditions.

[1]  A. J. Moulson,et al.  Water in silica glass , 1961 .

[2]  R. Fulrath,et al.  Solubility of Gases in Glass—A Monatomic Model , 1969 .

[3]  Richard M. Fulrath,et al.  Solubility of Gases in Glass. II. He, Ne, and H2 in Fused Silica , 1972 .

[4]  J. Simmons,et al.  Aqueous corrosion studies of a fluorozirconate glass , 1982 .

[5]  M. G. Drexhage,et al.  A phenomenological comparison of some heavy metal fluoride glasses in water environments , 1983 .

[6]  R. Doremus,et al.  Zirconium fluoride glass: surface crystals formed by reaction with water , 1984 .

[7]  W. Lanford,et al.  Reaction of zirconium fluoride glass with water: kinetics of dissolution , 1985 .

[8]  C. T. Moynihan,et al.  Surface ‐OH Profile from Reaction of a Heavy‐Metal Fluoride Glass with Atmospheric Water , 1985 .

[9]  J. Simmons,et al.  Chemical Durability of Fluoride Glasses: I, Reaction of Fluorozirconate Glasses with Water , 1986 .

[10]  J. Mackenzie,et al.  Comparative corrosion mechanism of ThF4 and ZrF4 based fluoride glasses in aqueous solutions , 1986 .

[11]  C. Simmons.  Chemical Durability of Fluoride Glasses: III, The Effect of Solution pH , 1987 .

[12]  C. Simmons.  Chemical Durability of Fluoride Glasses: II, Reaction of Barium‐Thorium‐Based Glasses with Water , 1987 .

[13]  J. Simmons,et al.  Infrared Spectroscopic Studies of the Hydrolysis Reaction During Leaching of Heavy‐Metal Fluoride Glasses , 1988 .

[14]  G. H. Frischat,et al.  Initial corrosion stages of a heavy metal fluoride glass in water , 1999 .

[15]  G. H. Frischat,et al.  Chemical stability of ZrF4- and AlF3-based heavy metal fluoride glasses in water , 2001 .

[16]  Y. Messaddeq,et al.  Study on the initial stages of water corrosion of fluorozirconate glasses , 2004 .

[17]  R. Vallée,et al.  Highly stable and efficient erbium-doped 2.8 microm all fiber laser. , 2009, Optics express.

[18]  Réal Vallée,et al.  Erbium-doped all-fiber laser at 2.94 microm. , 2009, Optics letters.

[19]  Shigeki Tokita,et al.  12 W Q-switched Er:ZBLAN fiber laser at 2.8 μm. , 2011, Optics letters.

[20]  S. Jackson.  Towards high-power mid-infrared emission from a fibre laser , 2012, Nature Photonics.