High precision laser forming for micro actuation

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademic

1 Citation (Scopus)


For assembly of micro-devices, such as photonic devices, the precision alignment of components is often critical for their performance. Laser forming, also known as laser-adjusting, can be used to create an integrated microactuator to align the components with sub-micron precision after bonding. In this paper a so-called three-bridge planar manipulator was used to study the laser-material interaction and thermal and mechanical behavior of the laser forming mechanism. A 3-D Finite Element Method (FEM) model and experiments are used to identify the optimal parameter settings for a high precision actuator. The goal in this paper is to investigate how precise the maximum occurring temperature and the resulting displacement are predicted by a 3-D FEM model by comparing with experimental results. A secondary goal is to investigate the resolution of the mechanism and the range of motion. With the experimental setup we measure the displacement and surface temperature in real-time. The time-dependent heat transfer FEM models match closely with experimental results, however the structural model can deviate more than 100% in absolute displacement. Experimentally, a positioning resolution of 0.1μm was achieved, with a total stroke exceeding 20μm. A spread of 10% in the temperature cycles between several experiments was found, which was attributed to a spread in the surface absorptivity. Combined with geometric tolerances, the spread in displacement can be as large as 20%. This implies that feedback control of the laser power, in combination with iterative learning during positioning, is required for high precision alignment. Even though the FEM models deviate substantially from the experiments, the 3-D FEM model predicts the trend in deformation sufficiently accurate to use it for design optimization of high precision 3-D actuators using laser adjusting. © (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only
Original languageEnglish
Title of host publicationLaser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XIX
EditorsYoshiki Nakata, Xianfan Xu, Stephan Roth, Beat Neuenschwander
Place of PublicationSan Francisco, CA, USA
Publication statusPublished - 1 Feb 2014
EventSPIE Photonics West 2014 - The Moscone Center, San Francisco, United States
Duration: 1 Feb 20146 Feb 2014

Publication series

NameProceedings of SPIE - the international society for optical engineering
ISSN (Print)0277-786X


ConferenceSPIE Photonics West 2014
CountryUnited States
CitySan Francisco
Other04-02-2014 - 06-02-2014


  • IR-91603
  • METIS-304376


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