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Sökning: WFRF:(de Ridder Rene M.)

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1.
  • Chang, Lantian, et al. (författare)
  • Chip based common-path optical coherence tomography system with an on-chip microlens and multi-reference suppression algorithm
  • 2016
  • Ingår i: Optics Express. - : Optical Society of America. - 1094-4087. ; 24:12, s. 12635-12650
  • Tidskriftsartikel (refereegranskat)abstract
    • We demonstrate an integrated optical probe including an on-chip microlens for a common-path swept-source optical coherence tomography system. This common-path design uses the end facet of the silicon oxynitride waveguide as the reference plane, thus eliminating the need of a space-consuming and dispersive on-chip loop reference arm, thereby obviating the need for dispersion compensation. The on-chip micro-ball lens eliminates the need of external optical elements for coupling the light between the chip and the sample. The use of this lens leads to a signal enhancement up to 37 dB compared to the chip without a lens. The light source, the common-path arm and the detector are connected by a symmetric Y junction having a wavelength independent splitting ratio (50/50) over a much larger bandwidth than can be obtained with a directional coupler. The signal-to-noise ratio of the system was measured to be 71 dB with 2.6 mW of power on a mirror sample at a distance of 0.3 mm from the waveguide end facet. Cross-sectional OCT images of a layered optical phantom sample are demonstrated with our system. A method, based on an extended Fourier-domain OCT model, for suppressing ghost images caused by additional parasitic reference planes is experimentally demonstrated.
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2.
  • Chang, Lantian, et al. (författare)
  • Waveguide-coupled micro-ball lens array suitable for mass fabrication
  • 2015
  • Ingår i: Optics Express. - : Optica Publishing Group. - 1094-4087. ; 23:17, s. 22414-22423
  • Tidskriftsartikel (refereegranskat)abstract
    • We demonstrate a fabrication procedure for the direct integration of micro-ball lenses on planar integrated optical channel waveguide chips with the aim to reduce the divergence of light that arises from the waveguide in both horizontal and vertical directions. Fabrication of the lenses is based on photoresist reflow which is a procedure that allows for the use of photolithography for careful alignment of the lenses with respect to the waveguides and enables mass production. We present in detail the design and fabrication procedures. Optical characterization of the fabricated micro-ball lenses demonstrates a good performance in terms of beam-size reduction and beam shape. The beam half divergence angle of 1544 nm light is reduced from 12.4 degrees to 1.85 degrees.
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