Abstract
Lasers capable of generating attosecond X-ray pulses in the water window (282 to 533 eV) through high-order harmonic generation are normally based on inefficient, multi-stage optical parametric amplifiers or optical parametric chirped pulse amplifiers pumped by femtosecond or picosecond lasers. Here we report a very efficient single amplification stage laser based on traditional chirped pulse amplification capable of producing 4 mJ, near-transform limited 44 fs (<6 cycles), 1 kHz pulses centered at 2.5 μm. The ≈90 GW peak power is the highest value ever reached at this wavelength. In order to fully compress the laser pulses our system is built in a nitrogen box. Our system utilizes water cooled chromium doped zinc selenide (Cr2+:ZnSe) as the gain medium and is pumped by a commercial nanosecond holmium doped yttrium-aluminum-garnet (Ho:YAG) laser.
Highlights
Lasers capable of generating attosecond X-ray pulses in the water window (282 to 533 eV) through highorder harmonic generation are normally based on inefficient, multi-stage optical parametric amplifiers or optical parametric chirped pulse amplifiers pumped by femtosecond or picosecond lasers
Since the first demonstration of tabletop attosecond light sources from high-order harmonic generation (HHG) in 20011,2, titanium doped sapphire (Ti:Sapphire) lasers centered at 800 nm have been the workhorse for attosecond research
The output beam is focused into a 0.8 mm thick BIBO crystal cut for type-I phase matching that allows for intrapulse difference frequency generation (IDFG)
Summary
Lasers capable of generating attosecond X-ray pulses in the water window (282 to 533 eV) through highorder harmonic generation are normally based on inefficient, multi-stage optical parametric amplifiers or optical parametric chirped pulse amplifiers pumped by femtosecond or picosecond lasers. In the initial work this was performed with a home-built 100 μJ optical parametric amplifier (OPA) pumped by a few mJ femtosecond Ti:Sapphire laser that was based on traditional chirped pulse amplification (CPA) technology[8]. The power amplifiers of the CPA are pumped by 527 nm nanosecond pulses with a total energy of more than 100 mJ supplied by Q-switched Nd:YLF lasers.
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