Fabrication of glass with complex geometric structures by digital additive manufacturing (3D printing) presents a paradigm shift in glass design and molding processes. Till now, 3D printing glasses have suffered from limited printed glass materials and the low resolution of particle-based or fused glass technologies. Herein, a high-resolution 3D printing of transparent nanoporous glass is presented, by the combination of transparent photo-curable sol-gel printing compositions and vat photopolymerization technology (Digital Light Processing, DLP). Multi-component transparent glass, including binary, ternary, and quaternary oxide nanoporous glass objects with complex shapes, high spatial resolutions, and multi-oxide chemical compositions are fabricated, by DLP printing and subsequent sintering process. We successfully demonstrated the photoluminescence and hydrophobic modification of 3D printed glass objectives. This work extends the scope of 3D printing to transparent nanoporous glasses with complex geometry and facile functionalization, making them available for a wide range of applications.
Broadband and multi-wavelength laser is an emerging research direction with promising future applications. The optical parametric oscillator has the characteristic of wide tunable wavelength and the zinc sulfide polycrystal doped with Cr2+ ions have a wide absorption spectrum. Combining the advantages of both output and input, a unique cascade structure using optical parametric oscillator as pump source is constructed for Cr2+:ZnS laser resonator. The output advantages of the cascade laser are studied by analyzing the characteristics of the continuous wave and pulse laser output from the experimental device. The experimental system successfully outputs a laser with a wavelength of 2330 nm and an average power of over 510 mW. The experimental system realizes the laser output of four wavelengths over 2000 nm in the three spectral regions of near infrared, short wave infrared and medium wave infrared. The experimental results provide a new idea and reference for differential absorption measurement and multi-component material measurement in toxic gas molecular detection and optical measurement.
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