Fig. 1. Raman effect in fiber^[23]. (a) Basic principle; (b) normalized spectra of Raman gain in quartz fiber when pump light and Stokes light are parallel polarized (solid line) and orthogonally polarized (dashed line)

Fig. 2. NPR mode-locked Raman fiber laser pumped by continuous multimode laser^[38]. (a) Schematic of structure; (b) pulse train; (c) temporal envelop of output Raman laser

Fig. 3. Pulse width switchable mode-locked Raman fiber laser based on NPR^[39]. (a) Structure schematic; (b) pulse train of nanosecond pulse output; (c) pulse train and temporal envelop of picosecond pulse output; (d) output spectra of two states; (e) spectrum of output pulses around fundamental repetition rate

Fig. 4. Raman dissipative soliton fiber laser with NPR^[40]. (a) Schematic of structure; (b) output spectrum; (c) spectrum of pulses around fundamental repetition rate; (d) autocorrelation trace after compression

Fig. 5. Wavelength-versatile Raman figure-8 fiber laser^[42]. (a) Structural schematic of 1.57 μm Raman figure-8 laser; (b) autocorrelation trace of 1.57 μm Raman ultrashort pulse; (c) autocorrelation trace of 1.41 μm Raman ultrashort pulse; (d) autocorrelation trace of 1.33 μm Raman ultrashort pulse

Fig. 6. Self-similar mode-locked Raman fiber laser with NOLM^[43]. (a) Structure schematic; (b) Raman self-similar pulse spectrum obtained by experiment and simulation; (c) Raman self-similar pulse temporal shape obtained by experiment and simulation

Fig. 7. All-polarization maintaining Raman laser system mode locked by NOLM. (a) Schematic of structure; (b) output spectrum; (c) spectrum around fundamental repetition rate; (d) autocorrelation trace

Fig. 8. Cavity shared ultrafast fiber laser^[50]. (a) Schematic of structure; (b) measured spectra of the dissipative soliton (triangle) and Raman dissipative soliton (circle) in experiment; (c) calculated spectra of dissipative soliton, Raman dissipative soliton and Raman light without feedback; (d) measured autocorrelation traces of dissipative soliton (triangle) and Raman dissipative soliton (circle) in experiment; (e) calculated temporal shapes of dis

Fig. 9. High performance synchronously pumped Raman dissipative soliton fiber laser^[51]. (a) Schematic of Raman fiber laser and pump laser; (b) output spectra of coherent Raman pulses at energies of 11 nJ and 18 nJ and noise-like pulses; (c) autocorrelation traces of coherent and noise-like Raman pulses at output of Raman laser; (d) autocorrelation traces of coherent and noise-like Raman pulses after external compression

Fig. 10. Synchronously pumped Raman fiber laser based on gain modulated pump^[52]. (a) Schematic of structure; (b) spectrum and temporal trace (inset) of fundamental Raman pulses; (c) spectrum and temporal trace (inset) of 2^nd-order Raman pulses; (d) radio frequency spectrum and temporal trace (inset) of 8^th-order Raman pulses

Fig. 11. 1.3 μm synchronously pumped Raman dissipative soliton fiber laser with phosphosilicate fiber^[54]. (a) Schematic of structure; (b) output spectra of Raman pulses; (c) autocorrelation trace of Raman pulses without compression

Fig. 12. Ultrashort pulse pumped Raman fiber laser with random distributed feedback^[55]. (a) Principle schematic; (b) configuration of the Raman laser; (c) autocorrelation trace of the Raman laser pulse; (d) normalized pedestal height of the autocorrelation trace as a function of pump power; (e) oscilloscope trace of the random distributed feedback light; (f) radio frequency spectrum of the random distributed feedback light; (g) comparison of the slope ef

Fig. 12. Ultrashort pulse pumped Raman fiber laser with random distributed feedback^[55]. (a) Principle schematic; (b) configuration of the Raman laser; (c) autocorrelation trace of the Raman laser pulse; (d) normalized pedestal height of the autocorrelation trace as a function of pump power; (e) oscilloscope trace of the random distributed feedback light; (f) radio frequency spectrum of the random distributed feedback light; (g) comparison of the slope ef