3.4-mJ 150-fs Fe:ZnSe hybrid mid-IR femtosecond system at 4.4 um for driving extreme nonlinear opticsстатья
Статья опубликована в высокорейтинговом журнале
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 3 июля 2019 г.
Аннотация:We report on entering new era of mid-IR femtosecond lasers based on amplification in relatively new gain chalcogenide medium Fe:ZnSe. Our hybrid all-solid-state laser system based on direct pulse amplification of femtosecond seed from three-stage AGS-OPA in Fe:ZnSe laser crystal optically pumped by Cr:Yb:Ho:YSGG Q-switched nanosecond laser (90 mJ, 45 ns, 2.85 µm) operating up to 10 Hz repetition rate regime provides 3.5-mJ 150-fs femtosecond pulses centered at 4.4 µm. Diode pumped Er:YAG/Er:YLF lasers makes it possible to increase the beam quality and repetition rate of proposed laser system up to 100 Hz. Focusing such a laser radiation into the ~3λ beam diameter allow to reach at focus laser intensity up to 10^16 W/cm^2 which is only an order of magnitude lower than a relativistic intensities 10^17 W/cm^2 and enough to drive strong nonlinear optics in mid-IR. We show as a proof-of-principle experiment the generation of four-octave spanning (from 350 nm up to 5.5 µm) supercontinuum in xenon.