In this paper, stress waves caused by laser pulses with three different temporal profile sets have been detected by using PVDF piezoelectric films. In the experiments, a solid target was irradiated by laser pulses in air. Firstly, the influence of laser pulse width on the stress wave’s pressure peak has been studied. The results show that the maximum pressure of the laser-induced stress wave will increase with increasing full width of laser pulse and there is a saturation width of the laser pulse. Then, the influence of laser pulse rise time on the stress waves’ pressure increasing process has been analyzed. The results show that a laser pulse with shorter rise time could produce the plasma as well as the stress wave, earlier. Earlier production time means that laser-induced stress wave has more time to improve its maximum pressure.
During the stimulated Brillouin scattering in multimode fiber, the Brillouin gain of different mode of the signal beam is affected by the property of both the light modes and acoustic modes in waveguides. In our study, the stimulated Brillouin scattering process in two-mode fiber is investigated, both experimentally and numerically, based on the mode characteristics of light field and acoustics field. The results indicate that the Brillouin gain of corresponding combination of signal-pump modes is determined by the overlapping area of optics-acoustic mode fields.
KEYWORDS: Pulsed laser operation, Pulse shaping, High power lasers, Laser systems engineering, Modulation, Solid state lasers, Distortion, Signal to noise ratio, Laser applications, Control systems
In high-power solid-state laser, initiative pulse shaping can help improve the output laser’s performance. The evaluation
for output laser pulse is also incomplete. In this paper, we propose a method of initiative pulse shaping by using arbitrary
waveform generator (AWG), and establish a relatively complete evaluation system for the output pulses shape
simultaneously. It achieves the super-Gaussian pulse output with high SNR (signal-to-noise ratio). As a consequence, a
square laser pulse with pulse adjustable width ~5ns, rising time 197ps is obtained. The power imbalance of the output
square pulse is 3.72%. The similarity between the eight-order super-Gaussian pulse and the one we get from experiment
reached 99%.
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