Abstract
The output performances of a bidirectional ring amplifier with twin pulses are demonstrated. Compared to the extraction efficiency of 32% for single-pulse injection, the extraction efficiency of stored energy for twin-pulse injection with bidirectional propagation is increased to 60%. The maximum output energies of the twin pulses are 347 mJ and 351 mJ, and the output energy of a single pulse is only 373 mJ under the same amplifier operating conditions. The experimental results show that the bidirectional ring amplifier with twin pulses can achieve a higher extraction efficiency of stored energy at a lower operating fluence, and has potential applications in high-power and high-energy laser facilities.
Highlights
Laser amplifiers have been widely used in the fields of engineering applications and scientific research, such as laser material processing[1], plasma physics[2, 3], laboratory astrophysics[4, 5], inertial confinement fusion (ICF)[6,7,8,9] and other important technologies
The propagation and amplification in the ring amplifier (RA) are simulated based on amplification theory[17, 18]
The dependence of the output energy on the number of round trips in the RA with single-pulse injection is shown in Figure 4, in which the blue line shows the experimental results for pulse-1, the red line shows the experimental results for pulse-2, and the gray bars are simulation results
Summary
Laser amplifiers have been widely used in the fields of engineering applications and scientific research, such as laser material processing[1], plasma physics[2, 3], laboratory astrophysics[4, 5], inertial confinement fusion (ICF)[6,7,8,9] and other important technologies. In 2014, Erlandson proposed a patent for a ring amplifier (RA) with a single pulse for compact, multi-pass pulsed laser amplifiers[14] This RA was more compact than the MA, it was difficult to extract the stored energy in the amplifiers efficiently and uniformly due to the single-pulse operation. Simulation results show that an extraction efficiency of 62.3% can be achieved at a lower average fluence of 10.3 J/cm and a lower injection energy of 3.9 mJ under the B integral limit compared to that of the MA. Compared to the effective extraction efficiency of 32% in an RA with a single pulse in the beam area, the maximum effective extraction efficiency of stored energy in the BRA with twin pulses is 60% under the same operating conditions
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