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Thermal and optical performance characteristics of a spatial light modulator with high average power picosecond laser exposure applied to materials processing applications

Zhu, G ; Whitehead, D ; Perrie, W ; Allegre, O.J ; Olle, V ; Li, Q ; Tang, Y ; Dawson, K ; Jin, Y ; Edwardson, S.P ; Li, L ; Dearden, G

Procedia CIRP, 2018, Vol.74, pp.594-597 [Peer Reviewed Journal]

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  • Title:
    Thermal and optical performance characteristics of a spatial light modulator with high average power picosecond laser exposure applied to materials processing applications
  • Author: Zhu, G ; Whitehead, D ; Perrie, W ; Allegre, O.J ; Olle, V ; Li, Q ; Tang, Y ; Dawson, K ; Jin, Y ; Edwardson, S.P ; Li, L ; Dearden, G
  • Subjects: Spatial Light Modulator ; Active Cooling ; High Power Laser Micro-Machining ; High Average Power Picosecond Laser ; Engineering
  • Is Part Of: Procedia CIRP, 2018, Vol.74, pp.594-597
  • Description: A spatial light modulator (SLM) addressed with Computer Generated Holograms (CGH’s) can create structured light fields when an incident laser beam is diffracted by a phase CGH. The power handling limitations of SLMs based on a liquid crystal layer have always been of some concern. Now, with careful engineering of chip thermal management, we present the detailed optical phase and temperature response of a liquid cooled SLM exposed to picosecond laser average powers up to 220W at 1064nm – new knowledge critical for determining device performance at high laser powers. SLM chip temperature rose linearly with incident laser exposure, increasing by only 5°C at 220W incident power, measured with a thermal imaging camera. Thermal response time with continuous exposure was 1-2 seconds. The optical phase response with incident power approaches 2π radians with average powers up to 130W while above this power, liquid crystal thickness variations limit phase response to just over π radians....
  • Language: English
  • Identifier: ISSN: 2212-8271 ; E-ISSN: 2212-8271 ; DOI: 10.1016/j.procir.2018.08.080
  • Source: ScienceDirect Journals (Elsevier)

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