3.5 kW coherently combined ultrafast fiber laser

Mueller, Michael; Klenke, Arno; Steinkopff, Albrecht; Shestaev, Evgeny; Tünnermann, Andreas; Limpert, Jens

doi:10.1117/12.2509693

Cited by 15 publications

(16 citation statements)

References 20 publications

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“…For the last few years, coherent beam combining (CBC) has been drastically increasing the performances of ytterbium-doped femtosecond fiber amplifiers, up to more than 10 mJ output energy and to the multi-kilowatt level [1,2]. CBC consists in coherently adding the output beams of several independent amplifiers seeded by a common source.…”

Section: Coherent Beam Combining Of 37 Femtosecond Fiber Amplifiersmentioning

confidence: 99%

Coherent beam combining of 61 femtosecond fiber amplifiers

Fsaifes¹,

Daniault²,

Bellanger³

et al. 2020

Opt. Express

117

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Section: Coherent Beam Combining Of 37 Femtosecond Fiber Amplifiersmentioning

confidence: 99%

Coherent beam combining of 61 femtosecond fiber amplifiers

Fsaifes¹,

Daniault²,

Bellanger³

et al. 2020

Opt. Express

117

View full text Add to dashboard Cite

show abstract

“…In the last years, materials processing with ultrafast lasers has gained attention for industrial applications due to the increase of the average power up to the 100-W region, allowing reasonable productivity. Today, the next generation of ultrafast laser systems, with several kilowatt of average power, has already been demonstrated in the laboratory [8,9]. Although the optimum irradiance for efficient processing with high quality is in the range of 10 11 -10 12 W/cm 2 as shown in [10], for example, such lasers allow one to achieve irradiances of up to about 10 15 W/cm 2 on the surface of the workpiece using appropriate focusing.…”

Section: Introductionmentioning

confidence: 99%

Expected X-ray dose rates resulting from industrial ultrafast laser applications

et al. 2019

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An analytical model is presented, which allows estimating the expected dose rates resulting from X-ray emission from ultrashort-pulse laser-produced plasma under industrial conditions. The model is based on the calculation of the Bremsstrahlung spectrum in the X-ray region between about 5 keV and 50 keV, which is created by the hot electrons in the plasma. The model was calibrated with both spectral and dose rate measurements. The scaling of the hot-electron temperature and the fraction of hot electrons in the plasma served as calibration values. The agreement between experiments and model for the investigated irradiances in range from 10 12 to 10 15 W/cm 2 is excellent. The expected Ḣ (0.07) and Ḣ (10) dose rates at a distance of 20 cm from the process in air were calculated for upcoming lasers with 1 kW of average power. Although the dose rates close to the plasma significantly exceed the allowed dose of 50 mSv per year for an irradiance exceeding about 2·10 15 W/cm 2 , the calculations show that shielding with a 2-mm sheet of iron already at a distance of 20 cm attenuates the radiation to a safe value below 0.4 µSv/h.

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“…Because ultrafast Yb-based laser systems can reach kilowattlevel average power [38][39][40][41], we believe that broadband THz sources based on optical rectification in GaP delivering tens of milliwatts of average power at megahertz repetition rates are soon to be within reach.…”

Section: Resultsmentioning

confidence: 99%

Optical rectification of ultrafast Yb lasers: pushing power and bandwidth of terahertz generation in GaP

et al. 2019

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We demonstrate broadband high-power terahertz (THz) generation at megahertz repetition rates by optical rectification in GaP driven by an ultrafast Yb-based thin-disk laser (TDL) oscillator. We investigate the influence of pulse duration in the range of 50-220 fs and thickness of the GaP crystal on the THz generation. Optimization of these parameters with respect to the broadest spectral bandwidth yields a gap-less THz spectrum extending to nearly 7 THz. We further tailor the driving laser and the THz generation parameters for the highest average power, demonstrating 0.3 mW THz radiation with a spectrum extending to 5 THz. This was achieved using a 0.5 mm thick GaP crystal pumped with a 95 fs, 20 W TDL, operating at 48 MHz repetition rate. We also provide a simple method to estimate the THz spectrum, which can be used for design and optimization of similar THz systems

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3.5 kW coherently combined ultrafast fiber laser

Cited by 15 publications

References 20 publications

Coherent beam combining of 61 femtosecond fiber amplifiers

Coherent beam combining of 61 femtosecond fiber amplifiers

Expected X-ray dose rates resulting from industrial ultrafast laser applications

Optical rectification of ultrafast Yb lasers: pushing power and bandwidth of terahertz generation in GaP

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