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Browsing by Author "Esser, MJD"

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Demonstration of a hybrid Ho:YLF Ho:LuLF slab laser

Author: Esser, MJD ; Collett, O ; Bollig, C Date: Oct 2010 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 stable-unstable ... Read more
Diode-end-pumped Tm:GdVO4 laser operating at 1818 and 1915 nm

Author: Esser, MJD ; Preussler, DR ; Bernhardi, EH ; Bollig, C ; Posewang, M Date: Oct 2009 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 pulse at 1.9 µm. The ... Read more
Direct comparison of the thermal lenses of diode-end-pumped Nd:YVO4 and Nd:GdVO4 lasers using a simple evaluation technique

Author: Esser, MJD ; Bollig, C ; Preussler, DR Date: 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 1], as shown in the ... 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
High average power 1314 nm Nd:YLF laser, passively Q-switched with V:YAG

Author: Botha, RC ; Strauss, Hencharl J ; Bollig, C ; Koen, W ; Collett, O ; Kuleshov, NV ; Esser, MJD ; Combrinck, L ; Von Bergmann, HM Date: Mar 2013 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 absorber in the cavity. ... Read more
High average power Q-switched 1314 nm two-crystal Nd:YLF laser

Author: Botha, RC ; Koen, W ; Esser, MJD ; Bollig, C ; Combrinck, WL ; Von Bergmann, M ; Strauss, Hencharl J Date: Feb 2015 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 inserting a Brewster-cut ... Read more
High-power diode-end-pumped Tm:YLF slab laser delivering 189 W at 1890 nm

Author: Koen, W ; Strauss, Hencharl J ; Bollig, C ; Esser, MJD Date: Sep 2010 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 1912 nm. At full ... 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
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
Q-switched Ho:YLF laser pumped by a Tm:GdVO4 laser.

Author: Esser, MJD ; Strauss, Hencharl J ; Koen, WS ; Preussler, D ; Nyangaza, K ; Bollig, C Date: Jun 2009 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 maximum output ... 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
Time-dependent analytical thermal model to investigate thermally induced stresses in quasi-CW-pumped laser rods

Author: Bernhardi, EH ; Forbes, A ; Bollig, C ; Esser, MJD Date: 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 analytical thermal model ... Read more

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