Solderjet bumping technique used to manufacture a compact and robust green solid-state laser

International Conference on Space Optics — ICSO 2016

et al. 2017

Self Cite

A high-precision opto-mechanical breadboard for a lens mount has been assembled by means of a laserbased soldering process called Solderjet Bumping; which thanks to its localized and minimized input of thermal energy, is well suited for the joining of optical components made of fragile and brittle materials such as glasses. An optical element made of a silica lens and a titanium barrel has been studied to replicate the lens mounts of the afocal beam expander used in the LIDAR instrument (ATLID) of the ESA EarthCare Mission, whose aim is to monitor molecular and particle-based back-scattering in order to analyze atmosphere composition. Finally, a beam expander optical element breadboard with a silica lens and a titanium barrel was assembled using the Solderjet Bumping technology with Sn96.5Ag3Cu0.5 SAC305 alloy resulting in a low residual stress (< 1 MPa) on the joining areas, a low light-depolarization (<0.2 %) and low distortion (wave-front error measurement < 5 nm rms) on the assemblies. The devices also successfully passed humidity, thermal-vacuum, vibration, and shock tests with conditions similar to the ones expected for the ESA EarthCare mission and without altering their optical performances.

Section: Discussionmentioning

confidence: 99%

Low-stress soldering technique used to assemble an optical system for aerospace missions

Ribes-Pleguezuelo

Koechlin²,

International Conference on Space Optics — ICSO 2016

et al. 2017

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“…We use an established PVD metallization system feasible for different substrate materials that consists of titanium, platinum, and gold. Using Solderjet Bumping we demonstrated sub-micron accuracy packaging of numerous micro-optical assemblies [18], the bonding of polarization maintaining fibers [19], the assembly of a compact and robust solid-state laser for the ExoMars mission [20], and the low stress mounting of lenses [21].…”

Section: Laser-based Solderjet Bumpingmentioning

confidence: 99%

Optical path difference evaluation of laser-soldered optical components

Hornaff

J. Eur. Opt. Soc.-Rapid Publ.

et al. 2015

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We present Solderjet Bumping, a laser-based soldering process, as an all inorganic joining technique for optical materials and mechanical support structures. The adhesive-free bonding process enables the low-stress assembly of fragile and sensitive components for advanced optical systems. Our process addresses high demanding applications, e.g. under high energetic radiation (short wavelengths of 280 nm and below and/or high intensities), for vacuum operation, and for harsh environmental conditions. Laser-based soldering allows the low stress assembly of aligned sub-cells as key components for high quality optical systems. The evaluation of the optical path difference in fused silica and the radiation resistant LAK9G15 glass components after soldering and environmental testing shows the potential of the technique.

“…16 The adapted LI device, here using soft-solder inorganic alloys, in contrast to commonly used organic adhesives. It promises higher robustness 17,18 and assures space-compatible devices 18 while avoiding damage to the optical components. 19,20 The LSP optical design was performed to obtain a device that can induce air breakdown at a distance comparable to the electrical discharge distance of an ESP used for ignition in a real automobile engine.…”

Section: Introductionmentioning

confidence: 99%

Assembly process and optical performances for a golden laser spark-plug device

et al. 2019

The low-stress Solderjet Bumping technique was employed to assemble the optical components of an increased-robustness laser spark-plug ignition device using the low melting alloys 96.5Sn3Ag0.5Cu and 80Au20Sn. A finite-element-method analysis, optical simulations, and a soldering parametrization test were performed to prove that different optical materials (sapphire, ECO-550, D-ZLaF52LA, TAC4, and N-SF11 glasses) could be fastened to the stainless steel body. The assembled spark-plug device featured a passively Q-switched Nd∶YAG∕Cr 4þ ∶YAG composite ceramic medium and delivered laser pulses with energy variable between 2.40 and 4.70 mJ, with 0.8 ns duration, suitable for inducing air breakdown phenomenon and engine combustion. © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.