Polarization smoothing based on full Poincaré beams modulated by stress-engineered optics.

In laser-driven inertial confinement fusion (ICF) facilities, nonuniform laser irradiation can cause significant challenges, such as hydrodynamics instability and laser plasma instability, which hinder the success of fusion. This article presents a new idea for improving the uniformity of far-field laser irradiation through a method of single-beam polarization smoothing. The method involves modulating full Poincaré beams using stress-engineered optics made from fused silica.

A Novel Method for Precision Measurement and Result Optimization of Detuning Angle for KDP Crystals.

In this paper, we investigate the theory of energy distribution when divergent light undergoes harmonic conversion in KDP crystals, and based on this theory, we design and construct a precision measuring instrument for the detuning angle of (KDP) Crystals (MIDC). The device can obtain the detuning angle of the crystal by a single measurement with an average measurement error of 72.78 urad.

Divergent beam-based method for measuring the detuning angles of a laser frequency converter.

We propose a method to obtain the detuning angles of a frequency converter by tripling the frequency of a divergent Gaussian beam. The frequency tripling process of the divergent beam was first simulated. It is found that the detuning angles of the frequency converter are linearly related to the position of the maximum light intensity point of the third harmonic laser.

Bio-inspired surface aberration mitigation technique for high-frequency conversion efficiency of large-aperture nonlinear optics.

Low-frequency conversion efficiency severely limits the 3ω ultraviolet energy density at the target of inertial confinement fusion facilities. Here, we present a bio-inspired surface aberration mitigation (SAM) technique that could significantly reduce the crystal surface aberration and realize high frequency conversion efficiency over a clear aperture of 400 mm × 400 mm. Numerical models are utilized to optimize and verify the mechanical properties and physical performance of the SAM technique.