Browsing Articles by Author "Farsund, Øystein"
Now showing items 1-6 of 6
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High pulse energy and symmetrical far field from an optical parametric oscillator in the red spectral range
Rustad, Gunnar; Farsund, Øystein (2011)Red pulses with >30 mJ energy and <0.6 nm bandwidth have been demonstrated using a type 2 phase matched optical parametric oscillator pumped at 532 nm. A symmetrical signal beam with beam diameter-divergence product of ~3 ... -
High-pulse-energy, linear optical parametric oscillator with narrow and symmetrical far field
Farsund, Øystein; Rustad, Gunnar (2013)A new method to obtain a narrow and symmetrical far field from a high-pulse-energy optical parametric oscillator (OPO) with a linear resonator has been tested. The OPO employs two identical nonlinear crystals that are cut ... -
Optical parametric oscillators with high pulse energy and beam quality
Rustad, Gunnar; Farsund, Øystein; Arisholm, Gunnar (2010)A new method for obtaining high beam quality from high pulse energy optical parametric oscillators (OPOs) is demonstrated. By using different nonlinear crystals that have walk-off in orthogonal directions but are type 2 ... -
Optimal classification of standoff bioaerosol measurements using evolutionary algorithms
Nyhavn, Ragnhild; Moen, Hans Jonas Fossum; Farsund, Øystein; Rustad, Gunnar (2011)Early warning systems based on standoff detection of biological aerosols require real-time signal processing of a large quantity of high-dimensional data, challenging the systems efficiency in terms of both computational ... -
Standoff detection of biological agents using laser induced fluorescence - a comparison of 294 nm and 355 nm excitation wavelengths
Farsund, Øystein; Rustad, Gunnar; Skogan, Gunnar (2012)Standoff detection measuring the fluorescence spectra of seven different biological agents excited by 294 nm as well as 355 nm wavelength laser pulses has been undertaken. The biological warfare agent simulants were released ... -
Sum-frequency generation of high-energy and hig-beam-quality ultraviolet pulses
Farsund, Øystein; Rustad, Gunnar (2011)Sum-frequency generation of UV pulses exceeding 25 mJ and with beam quality has been demonstrated by mixing the third harmonic pulses of a flash lamp pumped 1.06 μm Nd:YAG laser with 1.7 μm pulses from an optical parametric ...