Fabrication of microlens arrays in polycarbonate with nanojoule energy femtosecond laser pulses Academic Article uri icon

  •  
  • Overview
  •  
  • Research
  •  
  • Identity
  •  
  • Additional Document Info
  •  
  • View All
  •  

abstract

  • We report fabrication of smooth microlens arrays by focusing a nanojoule energy, high repetition rate femtosecond laser oscillator inside a polycarbonate sample. Heat accumulation at the laser focal point and subsequent material expansion leads to localized swelling at the sample surface that behaves as a microlens. By changing the depth of the laser focus in the sample, the focal length of the microlens can be controlled and varies from 40 to 80 μm while maintaining a high numerical aperture of ~0.6. This fabrication technique is a single step, controllable, and economical process that can produce arrays of optically smooth microlenses.

authors

  • Meunier, Trevor
  • Villafranca, Ana B
  • Bhardwaj, Ravi
  • Weck, Arnaud

publication date

  • October 15, 2012