Browsing by Author "Haakestad, Magnus W."
Now showing items 1-9 of 9
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Comparison of terahertz technologies for detection and identification of explosives
Beigang, René; Biedron, Sandra G.; Dyjak, Slawomir; Ellrich, Frank; Haakestad, Magnus W.; Hübsch, Daniel; Kartaloglu, Tolga; Ozbay, Ekmel; Ospald, Frank; Palka, Norbert; Puc, Uroš; Czerwinska, Elżbieta; Sahin, Asaf B.; Sešek, Aleksander; Trontelj, Janez; Švigelj, Andrej; Altan, Hakan; van Rheenen, Arthur; Walczakowski, Michał (2014)We present results on the comparison of different THz technologies for the detection and identification of a variety of explosives from our laboratory tests that were carried out in the framework of NATO SET-193 “THz ... -
Eye-safe fiber laser for long range 3D imaging applications
Holmen, Lars Grønmark; Rustad, Gunnar; Haakestad, Magnus W. (2018)We report an all-fiber Er/Yb master oscillator power amplifier at 1.55 μm, delivering 135 μJ pulses with 6 ns duration (full width at half-maximum) at 100 kHz pulse repetition frequency, limited by stimulated Brillouin ... -
High-pulse-energy mid-infrared fractional-image-rotation-enhancement ZnGeP2 optical parametric oscillator
Eichhorn, Marc; Schellhorn, Martin; Haakestad, Magnus W.; Fonnum, Helge; Lippert, Espen (2016)A high-energy mid-infrared ZnGeP 2 (ZGP) optical parametric oscillator (OPO) based on the nonplanar fractional-image-rotation enhancement resonator pumped by a 2.05 μm Ho 3+ :YLF laser is presented. Up to 120 mJ pulse ... -
Identification of mixed substances using a random forest regressor to classify THz absorbance spectra
Rheenen, Arthur Dirk van; Aurdal, Lars; Nystad, Helle Emilia; Haakestad, Magnus W. (2018)We report on the development and application of a random forest regressor that not only identifies but also estimates the relative concentrations of substances (one explosive and two simulants), both in one-substance and ... -
Non-destructive testing of graphene/epoxy composites using THz waves
Haakestad, Magnus W.; Johnsen, Bernt Brønmo; Dam, Anh Hoang; Mastin, Johann Roland M; Eid, Michel; Rheenen, Arthur Dirk van (2018-10-05)In earlier experiments [1] we found there was significant transmission of THz radiation through carbon-fiber enforced composites, despite that fact that the dc conductivity of the carbon fibers is expected to be good and ... -
Optical limiting properties and z-scan measurements of carbon disulfide at 2.05 μm wavelength
Holmen, Lars Grønmark; Haakestad, Magnus W. (2016)Nonlinear and optical limiting properties of carbon disulfide (CS 2 ) are characterized at 2.05 μm wavelength using a 𝑄 -switched Ho:YLF laser with high pulse energy. The nonlinear refractive index of CS 2 is measured ... -
Optical limiting properties of carbon disulfide at 2.05μm wavelength
Holmen, Lars Grønmark; Haakestad, Magnus W. (2016)Several types of infrared sensors are based on sensitive focal plane arrays. In such sensors, the intensity will typically increase by a factor ~107 at the focal plane, compared to the intensity of the incoming radiation. ... -
Robust eye-safe pulsed fiber laser source for 3D ladar applications
Holmen, Lars Grønmark; Rustad, Gunnar; Haakestad, Magnus W. (2017)We present a pulsed all-fiber Er/Yb-doped master oscillator power amplifier at 1.55 μm wavelength. In a simple two-stage amplifier design, the source delivers 140 μJ pulses at 25 kHz and 50 kHz pulse repetition frequency, ... -
Terahertz imaging of composite materials in reflection and transmission mode with a time-domain spectroscopy system
Sørgård, Trygve; van Rheenen, Arthur; Haakestad, Magnus W. (2016)A fiber-coupled Terahertz time domain spectroscopy (THz-TDS) system based on photoconductive antennas, pumped by a 100-fs fiber laser, has been used to characterize materials in transmission and reflection mode. THz images ...