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Rapid Decay of Type-II Femtosecond Laser Inscribed Gratings Within Q -switched Yb ^{3+} -Doped Fiber Lasers

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7 Author(s)
Aslund, M.L. ; Sch. of Chem., Univ. of Sydney, Sydney, NSW, Australia ; Jovanovic, N. ; Canning, J. ; Jackson, S.D.
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Fiber lasers that utilize femtosecond (fs) laser inscribed type-II fiber Bragg gratings within the active medium are known to produce stable output powers in excess of 100 W during continuous-wave operation. However, here we show that the gratings undergo rapid annealing when employed as high reflectors in pulsed Q-switched fiber lasers operating at average power levels of less than 0.5 W. We demonstrate that a combination of a high population inversion and a high optical field seems to drive this annealing process and point out similarities to photodarkening.

Published in:

Photonics Technology Letters, IEEE  (Volume:22 ,  Issue: 7 )