Diode pumped chirped pulse amplification to the joule level

Hein, Joachim; Podleska, S.; Siebold, M.; Hellwing, Marco; Bödefeld, R.; Sauerbrey, R.; Ehrt, D.; Wintzer, Wolfram

doi:10.1109/cleoe.2005.1567808

Cited by 4 publications

(1 citation statement)

References 17 publications

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“…Many institutes are going to obtain even higher power levels [10][11][12][13][14][15] . Multi-kilojoule short pulse laser systems are under development at the NIF in Livermore and at the Laser MegaJoule facility in Bordeaux, France 10,11 .…”

Section: Introductionmentioning

confidence: 99%

200 Terawatt femtosecond laser based on optical parametric amplification in DKDP crystal

Lozhkarev¹,

Гинзбург²,

Freǐdman³

et al. 2006

SPIE Proceedings

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200 TW (pulse duration 45 fs at energy 9 J) peak power has been achieved experimentally using a Cr:forsterite master oscillator at 1250 nm, a stretcher, three optical parametrical amplifiers based on KD*P (DKDP) crystals providing 14.5 J energy in the chirped pulse at 910 nm central wavelength, and a vacuum compressor. The final parametrical amplifier and the compressor are described in detail. Scaling of such architecture to multipetawatt power is discussed.

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Section: Introductionmentioning

confidence: 99%

200 Terawatt femtosecond laser based on optical parametric amplification in DKDP crystal

Lozhkarev¹,

Гинзбург²,

Freǐdman³

et al. 2006

SPIE Proceedings

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Monoenergetic proton beams from laser plasmas

Pfotenhauer

Jäckel

Amthor

et al. 2006

2006 Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference

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Operation of the all-diode pumped multi-terawatt-laser POLARIS

Hein

Bödefeld

Podleska

et al. 2009

CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference

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After years of investigations, the development of diode-laser pumped glass amplifiers for the POLARIS-laser system at the Friedrich-Schiller University of Jena reached the 10-J level of daily operation [1][2][3][4]. Pulses originating from a commercial fs-Titanium: Sapphire oscillator are amplified in the first stage AI, stretched to a ns-pulse duration in a 4-pass grating stretcher and further amplified in three consecutive stages A2 to A4. At the end of the chain they are re-compressed by a tiled grating compressor to a pulse duration of less than 170 fs (FWHM) [2]. In this presentation we summarize efforts made in recent years in order to provide a multi-terawatt laser output power.While in principle diode-pumping not only offers a way to generate high average-power laser-light [1] but also high pulse energies and peak powers several advances in diode-laser brightness and spectral characteristics, broad-band laser material composition, and amplifier design were required in order to exploit the inherent advantages of this technique. The solid state laser material chosen for POLARIS is an ytterbium-doped fluoride phosphate glass [5,6]. Low optical nonlinearity, large absorption and emission band widths are the key features for the amplification of ultra-short pulses. Nevertheless, low absorption cross-sections require a certain brightness of the pump source. Beam shaping techniques and fluence homogenization of the pump light generated in 1250 diode bars were used to overcome this drawback and ensure a high-quality beam profile.Femtosecond pulse amplification to terawatt output powers further requires maintaining broad-band amplification throughout the whole system. Gain narrowing effects particularly occurring in regenerative preamplifiers with a high total amplification factor need to be carefully compensated by intracavity spectral filters. Another requirement for efficient amplification is to provide high laser fluences at the amplifmg laser material. This is achieved by high damage threshold optics as well as a very large stretching factor of the CPAsystem on the cost of large grating size and separation required for re-compression. For the POLARIS system, a tiled grating was utilized and it was demonstrated that bandwidth-limited pulse compression and high quality beam profiles are feasible in this case.Applications of high peak power laser pulses in scientific experiments require a high contrast of the generated pulses against the amplified spontaneous emission. In our case the long fluorescence life time of the excited ytterbium ions of about 1.5 ms and the consequently low emission cross section help to provide this high contrast. Nevertheless a fast rise time Pockels cell installed after the first amplifier stage of amplification is able to significantly improve this contrast. Last but not least the focussability of the laser pulses has to be guaranteed. The POLARIS system has been equipped with an large-diameter adaptive mirror and a closed-loop control system for this purpose.While conducting high-in...

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Diode pumped chirped pulse amplification to the joule level

Cited by 4 publications

References 17 publications

200 Terawatt femtosecond laser based on optical parametric amplification in DKDP crystal

200 Terawatt femtosecond laser based on optical parametric amplification in DKDP crystal

Monoenergetic proton beams from laser plasmas

Operation of the all-diode pumped multi-terawatt-laser POLARIS

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