• Special Issue
  • High Energy Class-Diode Pumped Solid State Laser Technology
  • 6 Article (s)
High duty cycle, highly efficient fiber coupled 940-nm pump module for high-energy solid-state lasers
René Platz, Bernd Eppich, Juliane Rieprich, Wolfgang Pittroff, Götz Erbert, and Paul Crump
Tailored diode laser single emitters with long (6 mm) resonators and wide (1.2 mm) emission apertures that operate with 940 nm emission wavelength were assembled in novel edge-cooled vertically stacked arrays, and used to construct a compact and highly efficient fiber coupled pump source for Yb:YAG pulsed high-energy class solid-state lasers. The novel configuration is shown to allow repetition rates of 200 Hz at 1 ms pulse duration, at an output power of 130 W per single emitter. The emission of two stacked arrays was then optically combined to realize pump modules that deliver 6 kW peak power (pulse energy 6 J) from a 1.9 mm core diameter fiber, with wall plug efficiency of 50%. This represents a significant improvement in terms of duty cycle and electro-optical efficiency over conventional sources. The pump module has been successfully tested at the Max Born Institute, Berlin during trials for pumping of disk lasers.
High Power Laser Science and Engineering
  • Publication Date: Feb. 18, 2016
  • Vol.4 Issue, 1 010000e3 (2016)
Wide aperture piezoceramic deformable mirrors for aberration correction in high-power lasers
Vadim Samarkin, Alexander Alexandrov, Gilles Borsoni, Takahisa Jitsuno, Pavel Romanov, Aleksei Rukosuev, and Alexis Kudryashov
High Power Laser Science and Engineering
  • Publication Date: Mar. 01, 2016
  • Vol.4 Issue, 1 010000e4 (2016)
Laser diode stacks: pulsed light power for nuclear fusion
Martin Wölz, Agnieszka Pietrzak, Alex Kindsvater, Jens Meusel, Klaus Stolberg, Ralf Hülsewede, Jürgen Sebastian, and Valentin Loyo-Maldonado
Laser drivers are an enabling factor to inertial confinement fusion, because laser diodes must be used instead of flash lamps. We discuss the limitations of laser diode arrays and show what steps the industry is taking. The pump power requirements of large-scale projects such as LIFE or HiPER are within reach of semiconductor laser diode assemblies. Pulsed light output powers per laser bars have been around 300 W per bar, as in the Jenoptik 940 nm bars previously used for pumping the Yb:YAG slabs in the DiPOLE project. By redesigning the semiconductor laser structures 500 W per bar is now commercially available for 808, 880 and 940 nm pump wavelengths. The construction of one inertial fusion power plant will require an amount of semiconductor laser chips in excess of the current annual production by two orders of magnitude. This adds to the engineering task of improving the device characteristics a challenge to production capacity. While the industry benefits from the recent boost in solid-state lighting that acts as a technology driver, cooperation between manufacturers will be imperative, and to this end we propose standardization efforts.
High Power Laser Science and Engineering
  • Publication Date: Apr. 21, 2016
  • Vol.4 Issue, 2 02000e14 (2016)
Cryogenic nanosecond and picosecond high average and peak power (HAPP) pump lasers for ultrafast applications
David C. Brown, Sten Tornegård, and Joseph Kolis
Using cryogenic laser technology, it is now possible to design and demonstrate lasers that have concomitant high average and peak powers, with near-diffraction-limited beam quality. We refer to these new laser systems as HAPP lasers. In this paper, we review important laser crystal materials properties at cryogenic temperature, with an emphasis on Yb lasers, and discuss the important design considerations, including the laser-induced damage threshold, nonlinear effects and thermal effects. A comprehensive model is presented to describe diode pulsed pumping with arbitrary duration and repetition rate, and is used with the Frantz–Nodvik equation to describe, to first order, the performance of HAPP laser systems. A computer code with representative results is also described.
High Power Laser Science and Engineering
  • Publication Date: Apr. 29, 2016
  • Vol.4 Issue, 2 02000e15 (2016)
Design of deformable mirrors for high power lasers
Stefano Bonora, Jan Pilar, Antonio Lucianetti, and Tomas Mocek
High Power Laser Science and Engineering
  • Publication Date: May. 24, 2016
  • Vol.4 Issue, 2 02000e16 (2016)