Large Area Low-Cost Functional Ceramic Films with High Second Harmonic and Third Harmonic Light Absorption by Two-Step Fabrication

Functional ceramic films with high absorption are of crucial importance for application like eliminating stray light inside the inertial confinement fusion (ICF) devices. A key point for this application is high absorption rate with low-cost and relatively easy fabrication process, which largely enables to minimize the effect of stray light of ICF devices. Functional ceramic films (total thickness of 4 μm) are reported in this study with alumina, dielectric plasmonic nanocomposite (Cadmium selenide (CdSe) embedded in alumina (Al₂O₃)), and sealing layer (silicon dioxide (SiO₂)). It can be fabricated by low-cost two-step electrochemical machining in huge area ((Formula presented.) for demonstration) on many alloy substrates, including curved aluminum alloy 5083 and aluminum alloy 6061 substrates. However, it cannot be fabricated on flexible material substrates. The average absorption rate of functional ceramic films is over 90% in the wavelength range of 300–750 nm. As a results, functional ceramic films are used in the inner frame of ICF devices to eliminate the frequency-tripled and double-frequency nanosecond laser stray light with wavelength of 355 and 532 nm, which prevents the optical assembly from secondary damage caused by light remarkably.