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Browsing by Author "Jacobs, C"

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  • Strauss, HJ; Preussler, D; Esser, MJD; Koen, W; Jacobs, Cobus; Collett, OJP; Bollig, C (Optical Society of America, 2013-04)
    We report on a double-pass Ho:YLF slab amplifier which delivered 350 ns long single-frequency pulses of up to 330 mJ at 2064 nm, with a maximum M(sup2) of 1.5 at 50 Hz. It was end pumped with a diode-pumped Tm:YLF slab ...
  • Bollig, C; Strauss, HJ; Esser, MJD; Koen, W; Schellhorn, M; Preussler, D; Nyangaza, K; Jacobs, Cobus; Bernhardi, EH; Botha, LR (IEEE, 2009-06)
    Ho:YLF is an attractive laser material for 2 µm high energy sources since it has a much longer upper laser level lifetime (~14 ms) and higher emission cross section than Ho:YAG. In addition, the very weak thermal lens on ...
  • Koen, W; Bollig, C; Strauss, H; Schellhorn, M; Jacobs, Cobus; Esser, MJD (American Institute of Physics, 2010-04)
    The authors developed a compact Ho:YLF oscillator–amplifier system in a novel setup to utilise the unpolarised pump power from a fibre laser efficiently, and produced 21.3 mJ at 1 kHz, with an M 2 better than 1.1. The ...
  • Koen, W; Jacobs, Cobus; Wu, Lorinda; Strauss, H (SPIE, 2016-04)
    A selection of 2 µm lasers and amplifiers developed at the CSIR National Laser Centre in South Africa is presented. A diverse range of near diffraction-limited 2 µm lasers and amplifiers were developed which varied from ...
  • Strauss, HJ; Koen, W; Bollig, C; Esser, MJD; Preussler, D; Nyangaza, K; Jacobs, Cobus (OSA/CLEO/IQEC, 2009-06)
    In this paper, researchers have demonstrated that a Ho:YLF oscillator and amplifier system can be designed in a compact setup where the pump power from an unpolarized fibre laser utilized efficiently. The system produced ...
  • Koen, W; Jacobs, Cobus; Collett, O (2013-07)
    Laser sources emitting in the 2 micron region is of particular interest for applications in medicine, remote sensing (LIDAR) and directed infra-red countermeasures. In addition, they are also desirable pump sources for ...
  • Koen, W; Jacobs, Cobus; Collett, O; Esser, MJD (The Optical Society, 2013-10)
    A thulium fiber laser pumped Ho:YLF laser delivering 45.1 W in a near diffraction limited beam when pumped with 84.7 W is demonstrated. The optical-to-optical efficiency of 53 % compares favorably with similar Ho:YAG lasers.
  • Strauss, HJ; Koen, W; Bollig, C; Esser, MJD; Jacobs, Cobus; Collett, OJP; Preussler, DR (Optical Society of America, 2011-07)
    A single-frequency single-pass amplifier based on Ho:YLF and Ho:LuLF in a scalable slab architecture delivering up to 210 mJ at 2064 nm is demonstrated. The amplifier was end-pumped by a 1890 nm Tm:YLF slab laser and was ...
  • Botha, LR; Bollig, C; Esser, MJD; Campbell, RN; Jacobs, Cobus; Preussler, DR (Optical Society of America, 2009-10)
    A Ho:YLF laser pumped HBr molecular laser was developed that produced up to 2.5mJ of energy in the 4 micron wavelength region. The Ho:YLF laser was fiber pumped using a commercial Tm:fibre laser. The Ho:YLF laser was ...
  • Botha, LR; Bollig, C; Esser, D; Jacobs, Cobus; Preussler, D (South African Institute of Physics, 2009-07)
    A mathematical model was developed that accurately predicts the performance of an optically pumped HBr laser. Relatively high conversion efficiency was achieved. Tm pumped Ho:YLF is a viable source for pumping HBr laser, ...
  • Strauss, HJ; Burd, SC; Koen, W; Esser, MJD; Jacobs, Cobus; Collett, OJP; Nyangaza, K; Preussler, D; Bollig, C (2010-09)
    A novel multi-pass Tm: YLF laser was demonstrated with an improvement in efficiency, footprint and cost over a two diode stack pumped, single pass system. 100 W of output power from 261 W of incident diode pump power with ...
  • Koen, W; Jacobs, Cobus; Bollig, C; Strauss, HJ; Esser, MJD; Botha, LR (Optical Society of America, 2014-06)
    An optically pumped tunable HBr laser has been demonstrated for the first time. The pump source was a single-frequency Ho:YLF laser and amplifier system, which was locked to the 2064 nm absorption line of HBr. Laser ...
  • Bollig, C; Jacobs, Cobus; Esser, MJD; Bernhard, EH; Von Bergmann, HM (Optical Society of America, 2010-06)
    An end-pumped Nd:YLF laser was demonstrated, which delivered 60.3 W continuous-wave and more than 52 W Q-switched average power for all repetition rates from 5 to 30 kHz. To achieve this, an analytical solution to estimate ...
  • Jacobs, Cobus; Kriel, S; Bollig, C; Jones, T (2006-07)
    This presentation provides the overview of what laser pulse energy control is and why we need it. The simulation, experimental setup and results are shown
  • Esser, MJD; Preussler, D; Sharma, Ameeth; Jacobs, Cobus; Bollig, C (2009-11)
    In order to demonstrate the feasibility of a helicopter-based application using advanced laser technology, the authors have developed a rugged and compact mid-infrared solid-state laser. The requirement for the laser was ...