Fig. 1. Excited response of the molecule vibrational mode to the (a) single, (b) dual, and (c) three sub-pulses burst excitation signal, and (d) is the response on the case where the temporal distance of the adjacent sub-pulses is longer than the free oscillation duration. The inset (a), (b), (c), and (d) are the simulated optical excitation Gaussian signals for different regimes

Fig. 2. The normalized average gain within an optical excitation period versus the number of sub-pulses in a burst

Fig. 3. Schematic diagram of the measuring setup for the free oscillation duration of a KGW crystal

Fig. 4. Raman threshold versus the temporal distance

Fig. 5. Scheme of a multi-pulse burst pump KGW crystal Raman generator. Both the temporal profiles of inset (a) and (b) were detected by an InGaAs PIN detector (ET-3500 (EOT)) and a digital phosphor oscilloscope (DPO 70604C (Tektronix))

Fig. 6. Comparison of the SRS output performance for the three kinds of pumping regime

Fig. 7. (a) Stokes average power and (b) Stokes conversion efficiency versus incident pump average power for both of the vibrational modes of KGW. The dots represent actual data and the curves are the fit lines of the data values

Fig. 8. Stokes lines of the (a) 768 cm^–1 vibrational mode and (b) 901 cm^–1 vibrational mode

Fig. 9. Anti-Stokes lines of the (a) 768 cm^–1 vibrational mode and (b) 901 cm^–1 vibrational mode