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Browsing by Author "Bollig, 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 ...
  • Sivakumar, V; Tesfaye, M; Alemu, W; Sharma, Ameeth; Bollig, C; Mengistu, G (World Scientific Publishing Company, 2010-05)
    In this study, the authors present the climatological picture of aerosols over South Africa using 20 years of Stratosphere Aerosol and Gas Experiment (SAGE-II) satellite, 6–10 years of AErosol RObatic NETwork (AERONET) and ...
  • Sivakumar, V; Tesfaye, M; Alemu, W; Moema, D; Sharma, Ameeth; Bollig, C; Mengistu, G (2009-08)
    This presentation provides aerosol measurement over Southern Africa, using LIDAR, satellite and sun-photometer. Aerosol formation and processes are also given.
  • Tesfaye, M; Sivakumar, V; Mengistu, G; Botai, J; Sharma, Ameeth; Bollig, C; Rautenbach, CJdWH (2010)
    In this paper, the tropospheric aerosol load morphological classification and its impact on temporal variation of visibility are investigated using a continuous 23-hour single channel CSIR-NLC mobile LIDAR backscatter ...
  • 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 ...
  • Strauss, HJ; Bollig, C; Von Bergmann, M; Esser, MD (Institute of Electrical and Electronics Engineering (IEEE), 2009-06)
    Aimed to compare the two materials directly under diode-end-pumping by performing thermal lens measurements during lasing with a HeNe probe beam using identical low-doped (0.15%), 4x4x18 mm3 crystals. Our setup was such ...
  • Sivakumar, V; Sharma, Ameeth; Moema, D; Bollig, C; Van Der Westhuizen, C; Van Wyk, H (2008-05)
    A mobile LIDAR system is being developed at the Council for Scientific and Industrial Research (CSIR) National Laser Centre (NLC), Pretoria (25°5' S; 28°2' E), South Africa. The system is primarily designed for measuring ...
  • Sivakumar, V; Tesfaye, M; Alemu, W; Moema, D; Sharma, Ameeth; Bollig, C; Mengistu, G (Academy of Science of South Africa, 2009-11)
    The authors present the first scientific results from the Council for Scientific and Industrial Research-National Laser Centre (CSIR-NLC) mobile LIght Detection And Ranging (LIDAR) and its validation and comparison with ...
  • Sivakumar, V; Tesfaye, M; Botai, J; Moema, D; Sharma, Ameeth; Bollig, C; Hannes Rautenbach, CJ (IEEE, 2009-07)
    A mobile LIDAR (LIght Detection And Ranging) system is being developed and employed for atmosphere remote sensing at the Council for Scientific and Industrial Research (CSIR) National Laser Centre (NLC), Pretoria (25.45 ...
  • Sivakumar, V; Tesfaye, M; Moema, D; Sharma, Ameeth; Bollig, C (IEEE International Geoscience and Remote Sensing Symposium, 2009-07)
    In this paper, researchers present the obtained first scientific results from CSIR-NLC mobile LIDAR (LIght Detection And Ranging) and its validation/comparison with other ground and space-borne measurements. The LIDAR ...
  • Esser, MJD; Collett, O; Bollig, C (2010-10)
    The authors present a continuous-wave slab laser utilising both Ho:YLF and Ho:LuLF as laser gain media. 30 W of output power at 2 µm was demonstrated in a stable concave-plane resonator while 13 W was achieved in a hybrid ...
  • Sivakumar, V; Bollig, C; Sharma, Ameeth; Tesfaye, M (2010-09)
    In this paper, the authors describe the developmentof 2-Channel (532 nm and 355 nm) mobile LIDAR system for studying atmospheric particulate matter. The system is currently tested in house at the Council for Scientific and ...
  • Esser, MJD; Preussler, DR; Bernhardi, EH; Bollig, C; Posewang, M (Springer Verlag, 2009-10)
    High power operation at 1818 and 1915 nm has been demonstrated from a Tm:GdVO4 laser operating in quasi-continuous-wave mode with a maximum measured power of 8.7Wand a laser output energy of 175 mJ was observed in a 20 ms ...
  • Esser, MJD; Bollig, C; Preussler, DR (2006)
    In this work, the thermal lenses generated in diode-end-pumped Nd:YVO4 and Nd:GdVO4 lasers were evaluated and compared using a simple technique based on the stability criteria of a plane-parallel laser resonator [example ...
  • 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 ...
  • Bollig, C; Koen, W; Strauss, H; Bernhardi, EH; Botha, R; Esser, D; Preussler, DR (2008)
    Of the various Neodymium-doped materials, Nd:YLF is particularly attractive for use in high-power diode endpumped solid-state lasers due to its weak thermal lens, especially on the σ-polarisation, and it’s long upper laser ...
  • 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 ...
  • Strauss, HJ; Bollig, C; Botha, RC; Von Bergmann, HM; Burger, JP (2006-07)
    This presentation aims at the following: to develop new techniques to mount laser crystals; compare the laser properties of two equally doped, high power Nd:YVO4 and Nd: GdVO4 lasers; build a 1um vanadate laser with average ...