Abstract:In this work we demonstrate the compression of laser pulses at a high repetition rate, using transient stimulated Brillouin scattering (SBS). Output pulses with pulse durations close to the quarter-acoustic wave oscillation period (τf) was obtained. We find that the primary factors which limit the compression of pulses under high repetition-rate, transient conditions are the inherently low gain in the transient regime, thermal accumulation within the SBS medium and optical breakdown. We show that short phonon … Show more
“…As a highly effective means of achieving a narrow laser linewidth output, stimulated Brillouin scattering (SBS) can generate laser pulses with a short-pulse duration and high beam quality. [15][16][17][18][19][20] In addition, this study demonstrates that the SBS has a controllable output linewidth. [21][22][23][24][25] Spectral density S ( ) w of the Stokes radiation is given by: 26) S n ncA…”
This work demonstrates that the Brillouin gain linewidth and pump power density are the primary factors affecting the linewidth of the Stokes pulse. As the pump power density increases, the Stokes linewidth tends to narrow and approaches the pump linewidth. This is the first study to reveal that the pump linewidth is the limiting factor in narrowing the Stokes linewidth. The Stokes linewidths of different liquid media were compared, and it was found that media with a wide Brillouin gain linewidth can be used to obtain lasers with a wider range of linewidths.
“…As a highly effective means of achieving a narrow laser linewidth output, stimulated Brillouin scattering (SBS) can generate laser pulses with a short-pulse duration and high beam quality. [15][16][17][18][19][20] In addition, this study demonstrates that the SBS has a controllable output linewidth. [21][22][23][24][25] Spectral density S ( ) w of the Stokes radiation is given by: 26) S n ncA…”
This work demonstrates that the Brillouin gain linewidth and pump power density are the primary factors affecting the linewidth of the Stokes pulse. As the pump power density increases, the Stokes linewidth tends to narrow and approaches the pump linewidth. This is the first study to reveal that the pump linewidth is the limiting factor in narrowing the Stokes linewidth. The Stokes linewidths of different liquid media were compared, and it was found that media with a wide Brillouin gain linewidth can be used to obtain lasers with a wider range of linewidths.
“…The medium in the cell is FC-770, which has a high capacity, and some of the parameters are listed in Table 1. Based on previous studies [ 17 , 18 ] , achieving both narrow pulse width and high reflectivity in SBS systems is challenging due to the trade-off between high gain and short phonon lifetime. Both factors play crucial roles in SBS performance.…”
Section: Methodsmentioning
confidence: 99%
“…With respect to the results that show pulse durations less than τ Q , Liu et al [ 17 ] obtained pulse outputs of average duration close to τ Q in the new liquid medium PF-5060, where the shortest pulse duration measured was 0.88τ Q , with an energy reflectivity of around 30%. In the same year, Cao et al [ 18 ] also obtained a pulse output with a duration of less than τ Q at a repetition frequency of 200 Hz and an energy efficiency of less than 40%. While the research on transient SBS pulse compression is developing rapidly, little is known about aspects such as the energy reflectivity of transient SBS, particularly with regard to spot profiles.Figure 1 Schematic diagram of the experimental setup.…”
This work demonstrates the generation of short pulse duration and high-beam-quality laser pulses using transient stimulated Brillouin scattering at a high repetition rate. Thermal effects and optical breakdown are identified as the main factors that restrict energy reflectivity and beam quality under high repetition rates and transient situations. Through experimental analysis, the interaction length and focal point size are determined to be the key parameters in reducing the thermal effect by reducing the absorption of the laser pulse by the medium. The obtained results show that pulses with a duration of 175 ps and beam quality M2 of around 1.2 can be achieved with a maximum energy reflectivity of over 40% under an interaction length of 50 mm. Furthermore, at an interaction length of 90 mm, a pulse output with a minimum duration of 115 ps (0.5τQ) is achieved.
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