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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 ... -
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 ... -
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. -
All-Fiber Optical Supercontinuum Source at 1.7-2.9 μm
(Chapter, 2013)We report supercontinuum generation in the range of 1.7-2.9 μm at up to 3.08 W of output power from a Tm-doped pulsed fiber laser emitting between 1.9-2.5 μm, spliced with a nonlinear fluoride or germanate fiber. -
Broad-band GVD Measurement of Specialty Fibers in mid-IR
(Chapter, 2012)We demonstrate a novel interferometeric setup for broad-band (>300nm) GVD measurements in short-length optical fibers in the mid-IR wavelength range using a superluminescent fiber source and investigate specialty fibers ... -
Broadly tunable high-power continuous-wave Cr2+:CdS laser
(Chapter, 2011)We report spectroscopic and laser study of Cr2+:CdS laser - an attractive material for 3 µm room-temperature operation. 1.8 W of output power, continuously tunable over 1000 nm from 2240 nm to 3285 nm was demonstrated. -
Budal's latching-controlled-buoy type wave-power plant
(Chapter, 2003) -
Bølgjekraftverk av styrte svingande flottørar
(Chapter, 1978) -
Ceramic Cr:ZnS laser mode-locked by graphene
(Chapter, 2014)We report a high-power graphene mode-locked ceramic Cr:ZnS-laser, producing 3.9 nJ, 140 fs pulses with 45 nm spectral bandwidth at 270 MHz repetition rate, at output power for the first time exceeding 1 W level. -
Chaotic regime in chirped-pulse mid-IR oscillators
(Chapter, 2013)We present experimental investigation of the chaotic mode-locking operation regime in two novel chirped-pulsed Cr:ZnS and Cr:ZnSe mid-IR lasers. The long-term stable regime is caused by the nonlinear interaction of dispersive ... -
Clad-Pumped YDFLs Operating in the 1150-1200 nm Range
(Chapter, 2012)We demonstrate clad-pumped YDFLs operating at the 1147, 1160 and 1180 nm wavelengths at 35, 21 and 10.5 W of output power, respectively; operation at 1200 nm was realized for the first time. -
Climate Change and Fate of Arctic Oil Spills
(Chapter, 2017)To investigate how the fate of oil released in the Arctic Ocean may change with a warmer climate, we have performed ensembles of oil spill simulations using Arctic environmental information (winds, currents, ice cover, ... -
Compact Diode-pumped Dispersion-managed SESAM-mode-locked Ho:fiber Laser
(Chapter, 2016)We demonstrate for the first time a compact mode-locked holmium fiber laser diode-pumped at 1150 nm. The laser was operated in the dispersion-managed dissipative-soliton regime and provided 3.7 nJ pulse energy at 7.8 MHz PRF -
Continuum generation in Mid-IR from Tm-doped germanate fiber using femtosecond Cr:ZnS laser
(Chapter, 2012)The mid-IR supercontinuum generation in fibers has received much attention due to its broad applicability to high-resolution spectroscopy and trace gas analysis, frequency metrology and optical coherence tomography (OCT). ... -
Convergence of Ensemble Simulations for Environmental Risk Assessment
(Chapter, 2017)Ensemble simulations of oil fate and transport for a hypothetical oil spill, sometimes referred to as "stochastic simulations", are frequently used for environmental risk assessment related to offshore operations. In this ... -
Covariant Quantum Electrodynamics in Terms of a Possible Ether Flow
(Theoretical Physics Seminar in Trondheim;4, Chapter, 1971)This paper from 1971 has a special history. At that time the present author was working with the covariant quantization procedure for an electromagnetic field in a dielectric medium. In such a theory, the commutator for ... -
Cr:ZnSe Bulk and Cr:ZnSe Thin Disk cw Lasers
(Chapter, 2012)A Thulium-fiber-laser pumped Cr:ZnSe bulk cw laser with an output power of 6.5W as well as a Thulium-fiber-laser or diode-laser-stack pumped Cr:ZnSe thin disk cw laser with almost 2W of output powers will be presented. -
Currents in AC stressed liquid insulated needle plane gap
(Chapter, 2014)Currents and space charge phenomena in 8 different dielectric liquids have been investigated for an ac stressed needle plane gap. Applied frequencies ranged from 0.1 Hz to 100 Hz. A high resolution analogue-digital converter ...