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Browsing by Author "Esser, MJD"

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  • 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; 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.
  • Botha, RC; Strauss, HJ; Bollig, C; Koen, W; Collett, O; Kuleshov, NV; Esser, MJD; Combrinck, L; Von Bergmann, HM (Optical Society of America, 2013-03)
    A 1314 nm Nd:YLF laser was designed and operated both CW and passively Q-switched. Maximum CW output of 10.4 W resulted from 45.2 Wof incident pump power. Passive Q-switching was obtained by inserting a V:YAG saturable ...
  • Botha, RC; Koen, W; Esser, MJD; Bollig, C; Combrinck, WL; Von Bergmann, M; Strauss, HJ (Optical Society of America, 2015-02)
    A 1314 nm two-crystal Nd:YLF laser was designed and operated in both CW and actively Q-switched modes. Maximum CW output of 26.5 W resulted from 125 W of combined incident pump power. Active Q-switching was obtained by ...
  • Koen, W; Strauss, H; Bollig, C; Esser, MJD (South African Institute of Physics, 2010-09)
    The authors present a high-power Tm:YLF slab laser double-end-pumped by two 300 W laser diode stacks. The resonator was designed such that the laser emitted at 1890 nm instead of the conventional operating wavelength of ...
  • 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 ...
  • 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 ...
  • Esser, MJD; Strauss, H; Koen, WS; Preussler, D; Nyangaza, K; Bollig, C (2009-06)
    The authors have, through careful analysis of spectroscopic data, designed and demonstrated a diode-end-pumped, quasicontinuous wave Tm:GdVO4 laser operating at 1892 nm in order to pump a Q-switched Ho:YLF laser. The Ho:YLF ...
  • 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 ...
  • Bernhardi, EH; Forbes, A; Bollig, C; Esser, MJD (2008)
    One of the main problems that limit the power scaling of diode-end-pumped solid-state lasers is the generation of heat inside the laser gain medium which can ultimately cause fracture. In this paper a time-dependent ...