Fig. 1. 1018 nm fiber laser based on LD pump source

Fig. 2. Output powers and output spectra under different pump schemes. (a) Output power; (b) output spectra

Fig. 3. Output power change of laser. (a) Three-dimensional graph of output power change; (b) output power versus OC bandwidth under same OC reflectivity; (c) output power versus OC reflectivity under same OC bandwidth

Fig. 4. Output powers and output spectra under different gain fiber lengths. (a) Output powers; (b) output spectra

Fig. 5. Output characteristics of 1018 nm laser. (a) Output spectrum of 3.2 m YDF in 1018 nm laser; (b) comparison of actual output spectrum and simulated result; (c) output beam waist spot and beam quality

Fig. 6. Backward pump structure and comparison of output characteristics for forward pump and backward pump. (a) Structural diagram of backward pumped 1018 nm laser; (b) comparison of output spectra for forward pump and backward pump; (c) comparison of output powers for forward pump and backward pump

Fig. 7. Factors influencing laser output power instability. (a) Absorption cross-section curves of Yb^3＋ in quartz at different temperatures^[15]; LD output spectra at (b) 21 ℃，(c) 21.5 ℃，and (d) 19 ℃

Fig. 8. Real-time power curve of laser running continuously for 1 h