Terawatt diode-pumped Yb:CaF_2 laser

Siebold, M.; Hornung, Marco; Boedefeld, Ragnar; Podleska, S.; Klingebiel, Sandro; Wandt, Christoph; Krausz, Ferenc; Karsch, Stefan; Uecker, R.; Jochmann, A.; Hein, Joachim; Kaluza, Malte C.

doi:10.1364/ol.33.002770

Cited by 126 publications

(55 citation statements)

References 11 publications

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“…The measured spectrum remains also identical (3.1 nm FWHM, FTL 500 fs) to the injected one (Fig. 10) showing the interest to use Yb:CaF2 gain medium to avoid any gain narrowing [5,[13][14][15]. 6 Conclusion To summarize, the exact measurement of the thermal lens allows us to optimize the design of the Yb:CaF2 amplifier avoiding beam focusing and then to extract efficiently and reliably the energy without damaging the optics and access safely to a reliable stable regime within a 50-mJ range.…”

Section: Amplifier Resultssupporting

confidence: 53%

“…For these large-scale installations, cost-efficient solutions are preferred. Efficient diode pumping usually involves ytterbium-doped materials [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. The development of the technology is mainly based on the knowledge of the amplifying material.…”

Section: Introductionmentioning

confidence: 99%

“…It possesses a longfluorescence lifetime, 2.4 ms, which facilitates the storage of energy [4]. Also, the large bandwidth of this material makes it an attractive candidate for the generation and amplification of ultrashort pulses [5,11,12,15,[17][18][19]. The material also sustains high average power thanks to its good thermal conductivity, 6 Wm_1 K_1 (for a typical doping of 2%) [13,14,20].…”

Section: Introductionmentioning

confidence: 99%

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Diode-pumped Yb:CaF $$_2$$ 2 multipass amplifier producing 50 mJ with dynamic analysis for high repetition rate operation

et al. 2014

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The dynamic thermal issues of the Yb:CaF2 crystals within a multi-tens-mJ-energy multipass amplifier operating in the 20-100 Hz repetition rate range and pumped in quasi-cw regime have been studied at different timescales. Thermal response times of the system have been precisely investigated and analyzed, for the first time to our best knowledge in such amplifiers. This study includes a dual timescale analysis: in the long-time-scale (second) with direct thermography mapping and in the millisecond range with thermal lensing in a pump-probe configuration. Very atypical positive lens behavior with fluorites will also be presented and discussed. This complete analysis is used to demonstrate the capability of Yb:CaF2 multipass amplifier systems for operating the amplifier at 20 Hz with 57 mJ and 100 Hz with 32-mJ stable regime. Indeed, high repetition rate multipass amplifier has been realized for the first time with Yb:CaF2 and for this energy. The results have been analyzed precisely to take into account the thermal issues and excellent beam quality, with a M2 of 1.1. The pointing stability of 20 lrad has been measured documenting the reliability of the high repetition rate mJ amplifier.

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Section: Amplifier Resultssupporting

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Diode-pumped Yb:CaF $$_2$$ 2 multipass amplifier producing 50 mJ with dynamic analysis for high repetition rate operation

et al. 2014

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“…The amplified pulses can then either be sent to the main compressor or used as a seed for the final amplifier A5. This amplifier uses Yb:CaF 2 in a nine-pass configuration as the active material [23][24][25] and is currently able to deliver a maximum output energy of 16.6 J (with 2.7 J seed energy). The active material of this amplifier is pumped by 120 laser diode stacks in a 2.5 ms long pump pulse at 940 nm with a 300 kW pump power.…”

Section: Architecture Of the Polaris Lasermentioning

confidence: 99%

The all-diode-pumped laser system POLARIS – an experimentalist’s tool generating ultra-high contrast pulses with high energy

Hornung

Liebetrau²,

Seidel³

et al. 2014

High Pow Laser Sci Eng

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The development, the underlying technology and the current status of the fully diode-pumped solid-state laser system POLARIS is reviewed. Currently, the POLARIS system delivers 4 J energy, 144 fs long laser pulses with an ultra-high temporal contrast of 5×10 12 for the ASE, which is achieved using a so-called double chirped-pulse amplification scheme and cross-polarized wave generation pulse cleaning. By tightly focusing, the peak intensity exceeds 3.5 × 10 20 W cm −2 . These parameters predestine POLARIS as a scientific tool well suited for sophisticated experiments, as exemplified by presenting measurements of accelerated proton energies. Recently, an additional amplifier has been added to the laser chain. In the ramp-up phase, pulses from this amplifier are not yet compressed and have not yet reached the anticipated energy. Nevertheless, an output energy of 16.6 J has been achieved so far.

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“…A number of regenerative and multipass Yb:CaF 2 amplifier designs have been reported with the parameters peaking at 16.6 J pulse energy at sub-Hz repetition rate [25] and 160 mJ pulse energy at 20 Hz repetition rate [26] in the case of uncompressed ns pulses and reaching 420 mJ energy for compressed femtosecond pulses at 1 Hz repetition rate [27].…”

Section: Introductionmentioning

confidence: 99%

110-mJ 225-fs cryogenically cooled Yb:CaF_2 multipass amplifier

et al. 2016

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Abstract:We report on a diode-pumped cryogenically cooled bulk Yb:CaF 2 12-pass amplifier delivering 110-mJ, 1030-nm pulses at a 50-Hz repetition rate. The pulses have a spectral bandwidth of 13 nm and are compressed to 225 fs pulse duration in a double reflection grating based compressor having a transmission efficiency of >90%. The measured output beam quality is M 2 <1.1. A key feature of the amplifier design is the 4f relay imaging onto the gain medium with progressive beam magnification for the mitigation of the spatial gain narrowing effect. The number of passes in the amplifier is scalable by increasing the size of imaging mirrors. In order to prevent accumulation of nonlinear phase due to self-phase modulation in air, the amplifier is enclosed into a low-vacuum case. Baltuška, "Free-space nitrogen gas laser driven by a femtosecond filament," Phys. Rev. A 86(3), 033831 (2012). 22. A.

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Terawatt diode-pumped Yb:CaF_2 laser

Cited by 126 publications

References 11 publications

Diode-pumped Yb:CaF $$_2$$ 2 multipass amplifier producing 50 mJ with dynamic analysis for high repetition rate operation

Diode-pumped Yb:CaF $$_2$$ 2 multipass amplifier producing 50 mJ with dynamic analysis for high repetition rate operation

The all-diode-pumped laser system POLARIS – an experimentalist’s tool generating ultra-high contrast pulses with high energy

110-mJ 225-fs cryogenically cooled Yb:CaF_2 multipass amplifier

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