Fig. 1. Introduction to anti-radiation film. (a) Structure of the anti-radiation film. (b) Preparation process of ITO. (c) Metal foil coated with ITO film.

Fig. 2. Group experiment. (a) Active optical fibers coated with anti-radiation films. (b) The establishment of eight groups of controlled experiments.

Fig. 3. RIA spectroscopy. (a) The RIA of the optical fiber after the first radiation. (b) The RIA of the optical fiber after the second radiation.

Fig. 4. Laser experiment. (a) 1064 nm all polarization-maintaining fiber laser. PM-YSF, polarization-maintaining ytterbium-doped fiber; HR FBG, high-reflectivity fiber Bragg grating; WDM, wavelength division multiplexing; LR FBG, low-reflectivity fiber Bragg grating; ISO, isolator; LD, laser diode. (b) The laser power after the first radiation. (c) The laser power after the second radiation.

Fig. 5. Amplification experiment. (a) 1064 nm all polarization-maintaining fiber amplifier. (b) The amplifier power after the first irradiation. (c) The amplifier power after the second irradiation.

Fig. 6. RIA spectra for 5 weeks after the second radiation. (a) The RIA spectrum of Fiber D. (b) The RIA spectrum of Fiber G. (c) The RIA spectrum of Fiber F. (d) The RIA spectrum of Fiber H.

Fig. 7. Laser power curves for 5 weeks after the second radiation. (a) The laser power curve of Fiber D. (b) The laser power curve of Fiber G. (C) The laser power curve of Fiber F. (D) The laser power curve of Fiber H.

Fig. 8. Amplification power curves for 5 weeks after the second radiation. (a) The amplification power curve of Fiber D. (b) The amplification power curve of Fiber G. (C) The amplification power curve of Fiber F. (D) The amplification power curve of Fiber H.