Radiation Effects on an Active Ytterbium doped Fiber Laser
Technical Report,01 Sep 2014,24 Mar 2016
AIR FORCE INSTITUTE OF TECHNOLOGY WRIGHT-PATTERSON AFB OH WRIGHT-PATTERSON AFB United States
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This is the first published research focused on the impact of gamma and mixed gammaneutron radiation on an actively lasing ytterbium-doped fiber laser. While the gain medium of the laser was irradiated, the power was measured in-situ and the spectrum was recorded intermittently. The results indicate that as the total dose increased linearly with time, the laser experienced an exponential decay in power with a maximum power loss of 99.84 percent, and the lasing wavelength blue shifted up to 15 nm. The laser, when exposed to 145 kradSi, experienced less attenuation with a higher initial power than with a lower initial power. Power recovery experiments were conducted post-irradiation with the fiber laser off and actively lasing. Passively, the power recovered100 and 550 microW in 18 and 90 hours respectively. Active recovery experienced the same 100 microW recovery in 9.3 of the time 10min, and total power recovery of 12.6 percent and 4.4 percent for YDF1 and YDF2 respectively. The active recovery rate declined as the number of days following irradiation increased, indicating a saturation of recovery from less stable color centers being repaired.
- Lasers and Masers
- Fiber Optics and Integrated Optics
- Nuclear Physics and Elementary Particle Physics