Optimizing the cleanliness in multi-segment disk amplifiers based on vector flow schemes

Abstract

The objective of maintaining the cleanliness of the multi-segment disk amplifier in Shenguang-II (SG-II) is to reduce laser-induced damage for optics. The flow field of clean gas, which is used for the transportation of contaminant particles, is a key factor affecting the cleanliness level in the multi-segment disk amplifier. We developed a gas-solid coupling and three-dimensional flow numerical simulation model. The three-dimensional and two-phase flow model is verified by the flow-field smog experiment and the particle concentration measurement experiment with the 130-disk amplifier in SG-II. By optimizing the boundary conditions with the same flow rate, the multi-inlet vector flow scheme can not only effectively reduce the purging time, but also prevent the reverse diffusion of contaminant particles in the multi-segment disk amplifier and the deposition of contaminant particles on the surface of the Nd:glass.

A novel cleanliness control method for disk amplifiers

“…The modified SSA cavity. cavity, the flow field in the amplifier is characterized, and then the pollutant removal efficiency is reflected [12] . The steady-state flow field in the amplifier cavity was recorded.…”

“…Similarly, this method of IMAIPE is also time consuming, gas consuming, and also has some problems and risks caused by high gas pressure. In order to realize the cleanliness control of the amplifier cavity at one time, based on the original cleanliness control method of AIPE, through the reasonable design of air inlets and outlets of different amplifiers, Ren et al [11,12] realized cleanliness control with almost no turbulence. His findings also indicate that the amplifier cavity can quickly achieve cleanliness control without turbulence.…”

Status and development of high-power laser facilities at the NLHPLP

“…This later inspired the actual technical improvements of the SG-II UP nanosecond facility; a high-power laser prototype was launched to further pursue the optimization of the laser design and additionally test the 1ω output potential with investigations of the final optical issues. With some parameters changed by optimization and technical upgrade [55][56][57][58][59][60][61][62][63][64] , the outputs of 16 kJ/5 ns/1ω and 17.5 kJ/20 ns/1ω were achieved based on 16 Nd:glass slabs (11 slabs in the cavity amplifier and 5 slabs in the power amplifier) with 40 mm thickness. More than 100 shots with different pulse widths and energies in the 1ω output were finished in 2016.…”

Review of special issue on high power facility and technical development at the NLHPLP

“…In addition, Tang et al [11] present a new sensor for auto-alignment in a laser system based on ghost reflection. Ren et al [12] propose a cleaning technique and optimize the cleanliness in multisegment disk based on vector flow schemes, demonstrating more effective cleanliness levels with the vector flow scheme.…”

“…Ren et al. [12] propose a cleaning technique and optimize the cleanliness in multi-segment disk based on vector flow schemes, demonstrating more effective cleanliness levels with the vector flow scheme.…”