Abstract
A high-power laser system is employed to drive the fusion ignition to realize sustainable supply of green energy according to the inertial confinement fusion theory, in which frequency-converting crystals are sealed in the terminal vacuum chamber and utilized to turn the incident laser (1053 nm) to the desired one (351 nm). However, the reflected 351 nm laser from the pellet hohlraum that goes back through the frequency-converting crystal is found to be harmful for the upstream elements that are located before the terminal chamber. In this study, a specialized coating system for the frequency-converting crystals was designed and fabricated to both ensure high output power for the fusion and reduce the reflected 351 nm laser energy by absorption. Furthermore, the structural, mechanical, and laser-damage resistant properties of this coating were investigated as well.
Highlights
Potassium dihydrogen phosphate (KDP) and potassium dideuterium phosphate (DKDP) crystals are the very important nonlinear optical materials for the laser-driven inertial confinement fusion (ICF) [1,2,3,4,5,6]
In order to provide enough power to drive the ignition of ICF, the output laser energy from frequency-converting pairpair (FCP) is very high [7], requiring the minimized reflecting loss for all sides
Since UV curing has been applied for the coatings in high-power laser system [18], the UV PI is considered to be able to cure the high refractive index (HRI) coating and to absorb the reflected 3ω laser energy
Summary
Potassium dihydrogen phosphate (KDP) and potassium dideuterium phosphate (DKDP) crystals are the very important nonlinear optical materials for the laser-driven inertial confinement fusion (ICF) [1,2,3,4,5,6]. In the high-power laser driving system, one KDP and one DKDP are combined together as a frequency-converting pair (named as FCP). It is sealed in the terminal vacuum chamber and utilized to turn the incident near-infrared laser (1053 nm, named as 1ω) to the short-wavelength one (351 nm, named as 3ω). The incident side of the THG element suffers the same irradiation as the exit side of the SHG element, and its exit side suffers the irradiation of converted 3ω laser. In order to provide enough power to drive the ignition of ICF, the output laser energy from FCP is very high [7], requiring the minimized reflecting loss for all sides
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