High-precision surface mount assembly of micro-optical components per laser reflow soldering: positioning accuracy and thermal stability

Stauffer, Laurent; Walti, Felix; Vokinger, Urs; Siercks, K.

doi:10.1117/12.545510

Cited by 4 publications

(3 citation statements)

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“…The TRIMO-SMD technique (Three Dimensional Miniaturized Optical Surface Mounted Device) initiated by Hexagon Technology Center GmbH [2] is a mature packaging technology for systems where small optical components must be actively positioned to achieve highly accurate alignment (see Fig. 1).…”

Section: Assembly Technology Descriptionmentioning

confidence: 99%

Assembly technique for miniaturized optical devices: towards space qualification

Matthey

Mileti

Stauffer

et al. 2017

International Conference on Space Optics — ICSO 2012

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Abstract-We present the first steps executed to space qualify an assembly technique for miniaturized optical components that already demonstrated its maturity for the ground segment. Two different types of demonstrators have been manufactured and submitted to various tests: endurance demonstrators placed in simulated environment reproducing strong space environmental constraints that may potentially destroy the devices under test, and a functional demonstrator put in operational conditions as typically found in a satellite environment. The technology, the realized demonstrators and the results of the tests are reported.

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Section: Assembly Technology Descriptionmentioning

confidence: 99%

Assembly technique for miniaturized optical devices: towards space qualification

Matthey

Mileti

Stauffer

et al. 2017

International Conference on Space Optics — ICSO 2012

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“…This project aimed at the assessment of the Three Dimensional Miniaturized Optical Surface Mounted Device (TRIMO-SMD) technology performance in various environmental conditions, identification of the technology's limits in space applications, definition of the roadmap toward space qualification of the TRIMO-SMD. A fibre-coupled stabilization setup at 780 nm using a TRIMO-SMD assembling technique [9] was developed and realized (see [10] and are required for laser frequency stabilization [11]. The project will also benefit from the excellent buffer gas control achieved with the updated cell filling system and the high quality of the produced clock reference cells.…”

Section: Projects Involvedmentioning

confidence: 99%

“…-Towards a space qualified miniaturized device, a fiber-coupled stabilization setup at 780 nm using TRIMO-SMD assembling technique (Three Dimensional Miniaturized Optical Surface Mounted Device) [9] was developed and realized (see…”

Section: Reference Rubidium Cellmentioning

confidence: 99%

High-resolution spectroscopic studies in glass-blown and micro-fabricated cells for miniature rubidium atomic clocks

Pellaton¹

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Buffer-gas alkali vapour cells form the heart of essentially all types of commercial compact or miniaturized atomic clocks. They reliably hold and confine a vapour of alkali atoms, which provides the atomic transition frequency serving as stable reference for the clock oscillator. The desire to bring atomic clock stability to portable applications such as telecommunication and navigation increased the need for more compactness and lower power consumption. This motivated the present thesis work on the cells miniaturization and the novel clocks that could be realized with such cells. More than 150 glass blown cells were produced and tested and more than 30 microfabricated cells evaluated. We present the fabrication process for each type of them. We restrict ourselves to the spectroscopic analysis of certain cell types only, which are more oriented towards the miniaturization of an atomic clock. These evaluation techniques, developed in the frame of this thesis, allowed to tests the innovative (micro-) cells fabrication processes elaborated at the LTF and SAMLAB in Neuchâtel. In particular, the buffer gas mixture characterization with a resolution of ±1%, and the leak rate detection with a limit of 1.5 x 10-13 mbar l/s were achieved. This allowed the validation of two distinct sealing processes: the “classic” anodic bonding, and an innovative low temperature sealing technique using thermocompression of indium. As an alternative to the buffer gas, the use of certain types of wall coating also allows the atomic polarization preservation. Four different types have been used: Parylen C and N, Tetracontane and OTS. While the Parylene appears to be inadequate for use with rubidium atoms, excellent antirelaxing properties are obtained with tetracontane and OTS. The successful in-house fabrication of wall coated cells allowed the observation of the ripening process by double resonance spectroscopy. The results are presented and an interpretation is given. A microfabricated OTS wall coated cell was produced at Neuchâtel too, by R. Straessle at SAMLAB. We present its spectroscopic analysis and demonstrate truly antirelaxing properties of the coating in a 4.2 mm3 vapour volume. Finally, a spectroscopic and metrologic study of an innovative "cell-microwave resonator" assembly is presented. Both the cell and the resonator are microfabricated. The cell vapour volume is of the order of 50 mm3 only. Systematic shifts limiting the metrologic performances are characterized, with a focus on the light shift. A detailed, theoretical and analytical, analysis is presented in both, the D1 and D2, lines and for various optical pumping schemes. Frequency light shift is found to be one of the main stability limiting factor in the medium to long term regime. The limit is at a level of few 10-12. We demonstrate fractional frequency stability < 10-11 from 1 s up to one day of integration time with a resonator physics package volume of less than 0.9 cm3. An alternative interrogation scheme, suppressing completely the light shift, is discussed to improve the medium to long term performances. This scheme would allow the fabrication of an atomic clock extremely compact with highly competitive stability performances.

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Soldering techniques for the assembly of high power solid-state lasers

Dolkemeyer

Funck

Morasch

et al. 2009

CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference

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High-precision surface mount assembly of micro-optical components per laser reflow soldering: positioning accuracy and thermal stability

Cited by 4 publications

References 0 publications

Assembly technique for miniaturized optical devices: towards space qualification

Assembly technique for miniaturized optical devices: towards space qualification

High-resolution spectroscopic studies in glass-blown and micro-fabricated cells for miniature rubidium atomic clocks

Soldering techniques for the assembly of high power solid-state lasers

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