Browsing Articles by Author "Rustad, Gunnar"
Now showing items 1-9 of 9
-
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 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 master oscillator and power amplifier for efficient conversion of high-energy pulses with high beam quality
Arisholm, Gunnar; Nordseth, Ørnulf; Rustad, Gunnar (2004)We describe a system for parametric conversion of high-energy, Q-switched laser pulses from 1.064 µm to 2.1 µm in KTiOPO4. High beam quality and efficiency are obtained by use of a two-stage system: An optical parametric ... -
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 ... -
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, ... -
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 ...