Fig. 1. Optical setup of the high power narrow linewidth fiber amplifier

Fig. 2. Influence of γ radiation on the narrow linewidth seed source

Fig. 3. Temperature variation of the Yb-doped fiber before and after 50 krad(Si) radiation

Fig. 4. Amplified laser properties of the irradiated seed source

Fig. 5. The experimental setup of 793 nm photobleaching

Fig. 6. Irradiated laser source power versus 793 nm and 524 nm bleaching time