Blar i Publikasjoner fra CRIStin - NTNU på tidsskrift "Optics Express"
Viser treff 21-40 av 67
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Efficient half-harmonic generation of three-optical-cycle mid-IR frequency comb around 4 µm using OP-GaP
(Journal article; Peer reviewed, 2018)We report a broadband mid-infrared frequency comb with three-optical-cycle pulse duration centered around 4.2 µm, via half-harmonic generation using orientation-patterned GaP (OP-GaP) with ~43% conversion efficiency. We ... -
Efficient high-energy Raman soliton generation in a Tm:doped large mode area fiber amplifier
(Peer reviewed; Journal article, 2022)We report the Tm-doped all-fiber MOPA based on a LMA active fiber generating Raman solitons tunable in the range 1970-2300 nm directly from the LMA fiber. By tuning the chirp of the input pulse we reached more than 90 % ... -
Estimation of Fluorescent Donaldson Matrices Using a Spectral Imaging System
(Journal article; Peer reviewed, 2018)The present paper proposes a method to estimate the bispectral Donaldson matrices of fluorescent objects in a scene with a spectral imaging system. Multiple ordinary light sources with continuous spectral-power distributions ... -
Experimental and numerical studies of the scattering of light from a two-dimensional randomly rough interface in the presence of total internal reflection: Optical Yoneda peaks
(Journal article; Peer reviewed, 2016)The scattering of polarized light from a dielectric film sandwiched between two different semi-infinite dielectric media is studied experimentally and theoretically. The illuminated interface is planar, while the back ... -
Experimental investigation of Gaussian random phase screen model for x-ray diffusers
(Journal article; Peer reviewed, 2019)The beam diffusing properties of stacked layers of diffuser material were evaluated experimentally and compared to a Gaussian random phase screen model. The model was found to give promising accuracy in combination with a ... -
Femtosecond SESAM-modelocked Cr:ZnS laser
(Journal article; Peer reviewed, 2012)We report self-starting femtosecond operation of a 180-MHz SESAM-controlled prismless Cr:ZnS laser around 2400 nm at open air and room temperature. Dispersion compensation was achieved by a combination of bulk materials ... -
Finite-size limitations on quality factor of guided resonance modes in 2D photonic crystals
(Journal article; Peer reviewed, 2013)High-Q guided resonance modes in two-dimensional photonic crystals, enable high field intensity in small volumes that can be exploited to realize high performance sensors. We show through simulations and experiments how ... -
Graphene mode-locked Cr: ZnS chirped-pulse oscillator
(Journal article; Peer reviewed, 2014)We report the first to our knowledge high-energy graphene mode-locked solid-state laser operating in the positive dispersion regime. Pulses with 15.5 nJ energy and 42 nm spectral bandwidth with 0.87 ps duration were obtained ... -
Graphene Mode-locked Cr:ZnS Laser with 41 fs Pulse Duration
(Journal article; Peer reviewed, 2014)We report the ultrashort-pulse Cr:ZnS laser mode-locked by graphene-based saturable absorber mirror. Using the combination of bulk material and a chirped mirror, we demonstrate the shortest reported so far mid-IR pulses ... -
Heterodyne interferometer for absolute amplitude vibration measurements with femtometer sensitivity
(Journal article; Peer reviewed, 2013)A heterodyne interferometer for highly sensitive vibration measurements in the range 100kHz − 1.3GHz is presented. The interferometer measures absolute amplitude and phase. The signal processing of the setup is analyzed ... -
High peak power and energy scaling in the mid-IR chirped-pulse oscillator-amplifier laser systems
(Peer reviewed; Journal article, 2023)The paper introduces a new route towards the ultrafast high laser peak power and energy scaling in a hybrid mid-IR chirped pulse oscillator-amplifier (CPO-CPA) system, without sacrificing neither the pulse duration nor ... -
High-performance stationary solar tracking through multi-objective optimization of beam-steering lens arrays
(Peer reviewed; Journal article, 2020)Beam-steering lens arrays enable solar tracking using millimeter-scale relative translation between a set of lens arrays. This may represent a promising alternative to the mechanical bulk of conventional solar trackers, ... -
High-resolution polarization-sensitive Fourier ptychography microscopy using a high numerical aperture dome illuminator
(Peer reviewed; Journal article, 2022)Polarization-sensitive Fourier-ptychography microscopy (pFPM) allows for high resolution imaging while maintaining a large field of view, and without mechanical movements of optical-setup components. In contrast to ordinary ... -
Hyperbolic geometry for colour metrics
(Journal article; Peer reviewed, 2014)It is well established from both colour difference and colour order perpectives that the colour space cannot be Euclidean. In spite of this, most colour spaces still in use today are Euclidean, and the best Euclidean colour ... -
Inducing robustness and plausibility in deep learning optical 3D printer models
(Peer reviewed; Journal article, 2022)Optical 3D printer models characterize multimaterial 3D printers by predicting optical or visual quantities from material arrangements or tonal values. Their accuracy and robustness to noisy training data are crucial for ... -
Kerr nonlinear switching in a hybrid silica-silicon microspherical resonator
(Journal article; Peer reviewed, 2015)A hybrid silicon-core, silica-clad microspherical resonator has been fabricated from the semiconductor core fiber platform. Linear and nonlinear characterization of the resonator properties have shown it to exhibit ... -
LED primary selection algorithms for simulation of CIE standard illuminants
(Peer reviewed; Journal article, 2020)Although mixture of LEDs is being considered as a simulator of the CIE daylight series, the performance of the simulations is highly dependent on the SPD of the selected LEDs. An algorithm for selection of the best LEDs ... -
Light trapping in horizontally aligned silicon microwire solar cells
(Journal article; Peer reviewed, 2015)In this study, we demonstrate a solar cell design based on horizontally aligned microwires fabricated from 99.98% pure silicon via the molten core fiber drawing method. A similar structure consisting of 50 μm diameter close ... -
Line-focus solar concentration 10 times higher than the 2D thermodynamic limit
(Peer reviewed; Journal article, 2022)Line-focus solar concentrators have traditionally been limited by the 2D concentration limit due to the continuous translational symmetry in these systems. This limit is orders of magnitude lower than the 3D limit, severely ... -
Mueller matrix measurements and modeling pertaining to Spectralon white reflectance standards
(Journal article; Peer reviewed, 2012)The full Mueller matrix for a Spectralon white reflectance standard was measured in the incidence plane, to obtain the polarization state of the scattered light for different angles of illumination. The experimental setup ...