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Browsing Research Publications/Outputs by Author "Jacobs, Cobus"

Now showing items 1-16 of 16

330 mJ single-frequency Ho:YLF slab amplifier

Author: Strauss, Hencharl J ; Preussler, D ; Esser, MJD ; Koen, W ; Jacobs, Cobus ; Collett, OJP ; Bollig, C Date: Apr 2013 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 laser and seeded with ... Read more
Compact fibre-laser-pumped Ho:YLF oscillator-amplifier system

Author: Bollig, C ; Strauss, Hencharl J ; Esser, MJD ; Koen, W ; Schellhorn, M ; Preussler, D ; Nyangaza, K ; Jacobs, Cobus ; Bernhardi, EH ; Botha, LR Date: Jun 2009 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 the polarisation helps ... Read more
Compact fibre-laser-pumped Ho:YLF oscillator–amplifier system

Author: Koen, W ; Bollig, C ; Strauss, Hencharl J ; Schellhorn, M ; Jacobs, Cobus ; Esser, MJD Date: Apr 2010 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 amplified energies agreed ... Read more
Development of high-power and high-energy 2 µm bulk solid-state lasers and amplifiers

Author: Koen, W ; Jacobs, Cobus ; Wu, Lorinda ; Strauss, Hencharl J Date: Apr 2016 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 high-energy, ... Read more
Efficient fiber-laser-pumped Ho:YLF oscillator and amplifier utilizing the transmitted pump power of the oscillator

Author: Strauss, Hencharl J ; Koen, W ; Bollig, C ; Esser, MJD ; Preussler, D ; Nyangaza, K ; Jacobs, Cobus Date: Jun 2009 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 more than 20 mJ energy ... Read more
Efficient Ho:YLF laser pumped by a Tm:fiber laser

Author: Koen, W ; Jacobs, Cobus ; Collett, O ; Esser, MJD Date: Oct 2013 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. Read more
Efficient Ho:YLF laser pumped by a Tm:fiber laser

Author: Koen, W ; Jacobs, Cobus ; Collett, O Date: Jul 2013 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 efficient optical ... Read more
Ho:YLF & Ho:LuLF slab amplifier system delivering 200 mJ, 2 µm single-frequency pulses

Author: Strauss, Hencharl J ; Koen, W ; Bollig, C ; Esser, MJD ; Jacobs, Cobus ; Collett, OJP ; Preussler, DR Date: Jul 2011 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 seeded with a 69 mJ ... Read more
Ho:YLF pumped HBr laser

Author: Botha, LR ; Bollig, C ; Esser, MJD ; Campbell, RN ; Jacobs, Cobus ; Preussler, DR Date: Oct 2009 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 operated in a single ... Read more
Mathematical model of an optically pumped molecular laser

Author: Botha, LR ; Bollig, C ; Esser, D ; Jacobs, Cobus ; Preussler, D Date: Jul 2009 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, while HBr can be ... Read more
Multi-pass 1.9 um Tm:YLF slab laser pump source

Author: Strauss, Hencharl J ; Burd, SC ; Koen, W ; Esser, MJD ; Jacobs, Cobus ; Collett, OJP ; Nyangaza, K ; Preussler, D ; Bollig, C Date: Sep 2010 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 a slope efficiency ... Read more
Optically pumped tunable HBr laser in the mid-infrared region

Author: Koen, W ; Jacobs, Cobus ; Bollig, C ; Strauss, Hencharl J ; Esser, MJD ; Botha, LR Date: Jun 2014 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 oscillation was demonstrated ... Read more
Power and energy scaling of a diode-end-pumped Nd:YLF laser through gain optimization

Author: Bollig, C ; Jacobs, Cobus ; Esser, MJD ; Bernhard, EH ; Von Bergmann, HM Date: Jun 2010 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 and optimize the ... Read more
Pulse energy control through dual loop electronic feedback

Author: Jacobs, Cobus ; Kriel, S ; Bollig, C ; Jones, T Date: Jul 2006 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 Read more
Rugged and compact mid-infrared solid-state laser for avionics applications

Author: Esser, MJD ; Preussler, D ; Sharma, Ameeth ; Jacobs, Cobus ; Bollig, C Date: Nov 2009 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 to simultaneously ... Read more
Simulaser, a graphical laser simulator based on Matlab Simulink

Author: Jacobs, Cobus ; Koen, Wayne S Date: Jul 2016 We present a single-element plane-wave laser rate equation model and its implementation as a graphical laser simulation library using Matlab Simulink. Simulink’s graphical interface and vector capabilities provide a unique layer of abstraction ... Read more

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