Fig. 1. Schematic of the experimental setup for SBS pulse compression based on a rotating off-centered lens (HWP1 and HWP2, half-wave plates; L1–L6, lenses).

Fig. 2. Pump pulse widths of the laser system with different repetition rates.

Fig. 3. Schematic of thermal problems in the process of SBS pulse compression.

Fig. 4. Kinematic viscosity of the HT270 medium and the calculated gain coefficient with respect to the temperature.

Fig. 5. Calculated SBS energy efficiency with respect to the gain coefficient.

Fig. 6. Comparison of SBS output parameters before and after purification of the HT270 medium at a repetition rate of 1 kHz.

Fig. 7. Measured dependence of the SBS output power on the pump power at repetition rates of (a) 100 Hz, (b) 500 Hz, (c) 1000 Hz and (d) 2000 Hz with and without the rotating off-centered lens.

Fig. 8. Measured dependences of the SBS (a1)–(a4) output energy and (b1)–(b4) compressed pulse width on the pump energy at different repetition rates with and without the rotating off-centered lens.

Fig. 9. Stability of the SBS output energy at 2000 Hz with and without the rotating off-centered lens.

Fig. 10. Audio amplitude of the SBS output (a) with and (b) without the rotating off-centered lens at 2000 Hz.

Fig. 11. Measured dependence of the SBS energy efficiency on the pump energy at different repetition rates.

Fig. 12. Measured dependences of the SBS (a) reflected power, (b) reflected energy, (c) energy efficiency and (d) compressed pulse width on the repetition rate at pump energies of 20 and 35 mJ.

Fig. 13. Waveforms and beam patterns of (a) the pump and (b) SBS compressed pulse at a pump power of 70 W.