Searched for: author:"Song, H."
(1 - 6 of 6)
document
Fan, Y. (author), Oldenbeuving, R.M. (author), Klein, E.J. (author), Lee, C.J. (author), Song, H. (author), Khan, M.R.H. (author), Offerhaus, H.L. (author), Van der Slot, P.J.M. (author), Boller, K.J. (author)
We report on a novel type of laser in which a semiconductor optical amplifier (SOA) receives frequency-selective feedback from a glass-waveguide circuit. The laser we present here is based on InP for operation in the 1.55 ┬Ám wavelength range. The Si3N4/SiO2 glass waveguide circuit comprises two sequential high-Q ring resonators. Adiabatic...
conference paper 2014
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Oldenbeuving, R.M. (author), Song, H. (author), Schitter, G. (author), Verhaegen, M.H.G. (author), Klein, E.J. (author), Lee, C.J. (author), Offerhaus, H.L. (author), Boller, K.J. (author)
A novel and simple approach to optical wavelength measurement is presented in this paper. The working principle is demonstrated using a tunable waveguide micro ring resonator and single photodiode. The initial calibration is done with a set of known wavelengths and resonator tunings. The combined spectral sensitivity function of the resonator...
journal article 2013
document
Song, H. (author)
Adaptive optics (AO), also called as Smart Optics, has received increasing attention in the past decades. The main idea behind AO is to actively sense and compensate the optical aberration in the system such that the image resolution is improved or the light beam is well focused. The applications of AO include ground-based telescopes, scanning...
doctoral thesis 2011
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Song, H. (author), Fraanje, R. (author), Schitter, G. (author), Kroese, H. (author), Vdovin, G. (author), Verhaegen, M. (author)
In many scientific and medical applications, such as laser systems and microscopes, wavefront-sensor-less (WFSless) adaptive optics (AO) systems are used to improve the laser beam quality or the image resolution by correcting the wavefront aberration in the optical path. The lack of direct wavefront measurement in WFSless AO systems imposes a...
journal article 2010
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Song, H. (author), Vdovin, G. (author), Fraanje, R. (author), Schitter, G. (author), Verhaegen, M. (author)
In many scientific and medical applications wavefront-sensorless adaptive optics (AO) systems are used to correct the wavefront aberration by optimizing a certain target parameter, which is nonlinear with respect to the control signal to the deformable mirror (DM). Hysteresis is the most common nonlinearity of DMs, which can be corrected if the...
journal article 2008
document
Song, H. (author), Simonov, A.N. (author), Vdovin, G. (author)
Addressing of massive arrays of piezoelectric actuators is usually achieved by using separate high-voltage output drivers, one per channel. This approach applied to high-order adaptive optics systems results in complex, expensive and vulnerable to handling abuse driver electronics, hardly scalable to 103-104 actuators. To reduce the number of...
conference paper 2005
Searched for: author:"Song, H."
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