Fig. 1. SeeFiberLaser simulation structure diagram

Fig. 2. Variation of temperature in core and cladding

Fig. 3. Schematic diagram of fiber laser oscillator

Fig. 4. Output characteristic of fiber oscillator when pumped with 976 nm LD. (a) Output power and optical-to-optical(O-O) efficiency under different pump power; (b) Optical spectrum at the output power of 279 W; (c)-(d) Time domain signals and their Fourier spectra at the output power of 279 W and 235 W, respectively; (e) Beam quality factor and beam profile when the pump power is 483 W

Fig. 5. Output characteristic of fiber oscillator when pumped with 915 nm LD. (a) Output power and O-O efficiency under different pump power; (b) Optical spectrum at the output power of 502 W; (c)-(d) Time domain signals and their Fourier spectra at the output power of 502 W and 468 W, respectively; (e) Beam quality factor and beam profile when the pump power is 952 W

Fig. 6. Output characteristic of fiber oscillator when pumped with 940 nm LD. (a) Output power and O-O efficiency under different pump power; (b) Optical spectrum at the output power of 697 W; (c)-(d) Time domain signals and their Fourier spectra at the output power of 697 W and 693 W, respectively; (e) Beam quality factor and beam profile when the pump power is 1149 W

Table 1. TMI threshold for different pump wavelengths