Browsing Institutt for fysikk by Title
Now showing items 1-20 of 1753
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1 Watt femtosecond mid-IR Cr:ZnS laser
(Journal article; Peer reviewed, 2013)A room-temperature Kerr-Lens modelocked (KLM) Cr:ZnS laser generates <70 fs pulses duration (about eight optical cycles) with 5.6 nJ pulse energy and over 100 nm FWHM spectral width at 105-157 MHz repetition rates. The ... -
1.9 micron Tm3+-doped germanate fiber laser source for Si-processing
(Chapter, 2011)We report development of a novel Tm3+ -doped fiber laser source at 1.86 μm based on highly nonlinear 55GeO2-45SiO2 dispersion shifted fiber, applicable to 3D-volume microprocessing of Si. -
2.4 μm dual-comb spectroscopy
(Chapter, 2010)A proof-of-principle experiment of mid-infrared frequency comb Fourier transform spectroscopy is carried out with two interfering Cr2+:ZnSe femtosecond oscillators, emitting around 2400 nm. Spectra of acetylene are measured ... -
2D in situ røntgenavbilding av aluminiumskum under kompresjon
(Master thesis, 2019)Dette studiet ble gjennomført for å bestemme nytteverdien av todimensjonale in situ røntgenavbildninger for å undersøke dynamiske prosesser i tredimensjonale prøver. Aluminium skumble undersøkt ved bruk av radiogram of ... -
2D-Fourieranalyse av strekkindusert endring i kollagenstruktur
(Master thesis, 2009) -
2N+4-rule and an atlas of bulk optical resonances of zigzag graphene nanoribbons
(Journal article; Peer reviewed, 2020)Development of on-chip integrated carbon-based optoelectronic nanocircuits requires fast and non-invasive structural characterization of their building blocks. Recent advances in synthesis of single wall carbon nanotubes ... -
3D Maps of Mineral Composition and Hydroxyapatite Orientation in Fossil Bone Samples Obtained by X-ray Diffraction Computed Tomography
(Journal article; Peer reviewed, 2018)Whether hydroxyapatite (HA) orientation in fossilised bone samples can be non-destructively retrieved and used to determine the arrangement of the bone matrix and the location of muscle attachments (entheses), is a question ... -
3D modelling of β'' in Al-Mg-Si: towards an atomistic level ab initio based examination of a full precipitate enclosed in a host lattice
(Journal article, 2014)We extend a first principles based hierarchical multi-scale model scheme for describing a fully coherent precipitate in a host lattice to 3D simulations. As our test system, the needle-shaped main hardening Al–Mg–Si alloy ... -
3D TEM characterization of silver implanted silicon for intermediate band solar cells
(Master thesis, 2017)As the need for renewable and sustainable energy sources are growing solar cells are turning into one of the most affordable and widely adopted solutions for renewable electricity production. This is driven by a steady ... -
3D-EPI with parallel imaging acceleration along two Axis: Evaluated with Phantom Study and BOLD fMRI
(Master thesis, 2013)The function of the human brain has for many years been an intriguing field of research, and has led to the discovery of functional MRI (fMRI). fMRI is dependent on high spatial and temporal resolution to acquire detailed ... -
3W Raman Soliton Tunable between 2-2.2 µm in Tm-Doped Fiber MOPA
(Chapter, 2013)The simple and compact Tm-doped fiber MOPA generates tunable between 2-2.2 µm Raman solitons with average power up to 3W. Pulses as short as 130 fs and energy up to 38 nJ were demonstrated. -
5 W Supercontinuum Generation at 1.9-2.5 μm from a Tm-Doped All-Fiber MOPA Laser
(Chapter, 2013)We report a simple method of generating flat-top high power (5W) supercontinuum from an all-silica-fiber Tm-MOPA laser emitting in the interesting for applications 1.96-2.48 μm range (at -5 dB level), covering transparency ... -
6.8 W all-fiber supercontinuum source at 1.9-2.5 um
(Journal article; Peer reviewed, 2014)We report a simple method of generating a spectrally flat and high average power spectral density (up to 14 mW/nm) optical supercontinuum in the 1.95–2.5 μm range covering a transparency window of the atmosphere. The ... -
8.6 MHz Extended Cavity Cr:ZnS Chirped-pulse Oscillator
(Chapter, 2018)We report the first extended cavity Cr:ZnS chirped-pulse oscillator mode-locked by graphene. We demonstrate 415 mW average power at 8.6 MHz repetition rate which results in 48 nJ pulse energy. -
A Benders Decomposition Method for a Multi-stage Stochastic Energy Market Equilibrium Problem
(Master thesis, 2014)In this thesis, a stochastic energy market equilibrium model is developed and implemented in GAMS. The model involves multi objective optimization and is solved as a mixed complementarity problem. To provide an efficient ... -
A Bivariate Analysis of the Homogeneous Plane-Wave Assumption in Magnetotelluric Theory
(Master thesis, 2015)The magnetotelluric method is an electromagnetic induction method used to image subsurface resistivity. It utilizes Earths' natural time-varying electromagnetic field as a source. The fields propagating into the subsurface ... -
A Bosonic Coherent State Path Integral Representation for Spin Systems based on a Projection Operator Implementation of the Schwinger boson number constraint
(Master thesis, 2018)The path integral single spin partition function in the basis of boson coherent states, for a general normal ordered two-mode Schwinger boson Hamiltonian, has been computed. Within the initial phase of the calculational ... -
A bridge between statistical learning and agent based modelling in stock market predictions
(Master thesis, 2016)The research related to agent based modelling and statistical learning has increased in the recent years, as alternatives to main stream econometrics. This project combines the three for constructing and evaluating a ... -
A Comparison of Biological Dose Estimates in Proton and Carbon Ion Therapy Based on Averaged and Full Linear Energy Transfer Spectra
(Master thesis, 2015)Radiotherapy with ions, also known as particle therapy, is increasing rapidly. Shifting from photons to protons and carbons is not only a great technological transition, but also a shift in physics and in radiobiology. ... -
A comparison of Gravity Wave Parameters derived from the Analysis of a Three-Field Photometer with Imagers
(Master thesis, 2015)A method for preprocessing and analysing a few select fields in airglow intensity images from an all-sky imager was developed and utilized. Waves detected with a three-field analysis were compared with those waves ...