FSLA — Laser Processing of Glass and Sapphire

Liebers, Rene; Gebhardt, Mandy

doi:10.1002/latj.201700004

Cited by 2 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The proposed process for creating the layer geometry and removing material for CTE-tuning is ultrafast laser ablation. Ultrafast lasers have been used for cleanly ablating glass, sapphire, and metals while minimally affecting the surrounding area [3,4].…”

Section: Ablation-tunable Composite Conceptsmentioning

confidence: 99%

“…In all three designs, sapphire is chosen as one of the constituent materials due to its high elastic modulus (𝐸 = 430 𝐺𝑃𝑎) and its transparency to near-infrared light (𝜆 ≈ 1 𝜇𝑚). This transparency enables the use of ultrafast laser fabrication processes that result in precise 'cold' ablation with minimal heat-affected zone [3,4].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Design of layered sapphire composites with ablation-tunable coefficient of thermal expansion

Chalifoux

2023

Optomechanical Engineering 2023

View full text Add to dashboard Cite

Composites with high elastic modulus, high specific stiffness, and ultra-low coefficient of thermal expansion (ppb/K-level) will likely be necessary for future ultra-stable optomechanical systems, such as space telescopes for high-contrast imaging. Carbon fiber reinforced polymers (CFRP) offer many favorable properties but suffer from instability due to moisture absorption and creep, and currently cannot cost-effectively achieve the 1-5 ppb/K coefficient of thermal expansion (CTE) required. New materials are desired with high elastic modulus, high specific stiffness, and ppb/K-level CTE. This paper presents three composite designs whose CTE is tunable by ablating material from one or more layers after fabrication and CTE metrology. Each composite design contains sapphire facesheets and a core material of fused silica, silicon carbide or Allvar® to achieve zero- and tunable-CTE. Finite element models reveal that each composite design exhibits CTE tunability of 200-800 ppb/K. The specific stiffness of the Sapphire-Allvar® composite design is around 60 GPa/(g/cc), whereas the others have lower specific stiffness < 20 GPa/(g/cc). These designs demonstrate the principle of tunable low- CTE materials that may have promise for future ultra-stable telescopes.

show abstract

Section: Ablation-tunable Composite Conceptsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design of layered sapphire composites with ablation-tunable coefficient of thermal expansion

Chalifoux

2023

Optomechanical Engineering 2023

View full text Add to dashboard Cite

show abstract

Ultrashort pulsed laser backside ablation of fused silica

et al. 2021

View full text Add to dashboard Cite

We report on the fabrication of rectangular microchannels with vertical sidewalls in fused silica by laser backside ablation. A 515 nm femtosecond laser is focused by an objective with a NA of 0.5 through the sample on the glass/air interface, allowing processing from the backside into the bulk material. Experimental investigations reveal a logarithmically increasing depth of the channels with an increasing number of scans, while keeping the focal position fixed. A certain number of scans has to be applied to generate rectangular shaped channels while their depth can be controlled by the applied fluence from 2.64 µm to 13.46 µm and a corresponding ablation roughness R a between 0.20 µm and 0.33 µm. The channel width can be set directly via the number of parallel ablated lines demonstrated in a range from 10 µm to 50 µm. By adjusting the focal position after each scan the channel depth can be extended to 49.77 µm while maintaining a rectangular channel geometry. Finally, concentric rings are ablated to demonstrate the flexibility of the direct writing process.

show abstract

FSLA — Laser Processing of Glass and Sapphire

Abstract: 3D-MicromacChemnitz, Germany 3D-Micromac is the leading specialist in laser micromachining. 3D-Micromac delivers powerful, user-friendly and leading edge processes with superior production efficiency. These proprietary technology innovations are now readily available on a worldwide scale.

Cited by 2 publications

References 0 publications

Design of layered sapphire composites with ablation-tunable coefficient of thermal expansion

Design of layered sapphire composites with ablation-tunable coefficient of thermal expansion

Ultrashort pulsed laser backside ablation of fused silica

Contact Info

Product

Resources

About