HE-TOPAS
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High energy optical parametric amplifier General description High energy TOPAS is an optical parametric amplifier pumped by amplified Ti:sapphire lasers to produce the highest possible pulse energy with tunable output wavelength. HE-TOPAS consists of three crystals based independently phase and time matched amplification stages to provide nearly bandwidth limited output. Thanks to wisely several times folded optical layout, the system is easily reconfigurable for different pump pulse parameters. Also, inspection and adjustment of the system are easy to perform: each consecutive amplification stage is unbound from the previous stage in terms of beam position/direction. Low dispersion power amplification Travelling wave three stage ensures the shortest output pulses available right at the output port of HE-TOPAS. amplification stages white light seeded OPA Pump energy of up to 80 mJ Energy conversion into the parametric radiation up to 45% Continuously wavelength tunable in 190 nm –20 µm range Adaptable to different pump pulse energy, repetition rate and pulse duration Computer control via USB port White light is used as the seed for the first amplification stage of HE-TOPAS providing the highest possible pulse-to-pulse stability of amplified pulses. In addition to broad tunability of the system the users are also provided with passively CEP locked near-IR output pulses in 1600–2600 nm range even when the HE-TOPAS is pumped with non-CEP locked pulses from the amplifier. New monolithic housing of the OPA ensures mechanical robustness and minimal environmental sensitivity of the system. Internal volume divider and two covers separate power-amplification stage from the previous two minimizing air turbulence inside the housing. For extremely high input power levels HE-TOPAS is equipped with water cooled beam dumps to reduce heating effect to the system’s performance. HE-TOPAS can accept pump pulse energies as high as 20 mJ @ 20–30 fs and 80 mJ @ 100–200 fs and produce tunable IR pulses of up to several millijoule of energy. With a APPLICATIONS Higher harmonics generation number of ~30 systems sold in the world market HE-TOPAS has become a leader and a new standard for high energy OPA. CEP locked near-IR pulses A few options are offered to extend the tuning range of the system to VIS-UV and mid-IR Time-resolved spectroscopy ranges: separate standing frequency mixer stages or NirUVis – housing integrated Nonlinear optics harmonics/sum-frequencies generation and wavelength separation unit, HE-NDFG – non-collinear difference frequency generator to extend the tunability of the system up to 20 µm in background-free output pulses.

Specifications for 800 nm, 10 mJ, Gaussian beam pump at 1 kHz Output from HE-TOPAS Signal and Idler version Specification Signal & Idler tuning range Energy (Signal + Idler) Output pulse duration Time-bandwidth product 20–60 fs pump 1140–2600 nm >2500 µJ at peak (1.2–1.5) × pump pulse width <1 60–200 fs pump 1140–2600 nm >2500 µJ at peak (0.7–1.0) × pump pulse width <1 Output energy from optional wavelength extension unit NirUVis Extension tuning range and interaction 570–1140 nm, SH of Signal (SHS), SH of Idler (SHI) 533–580 nm, Pump + Idler (SFI) 470–533 nm, Pump + Signal (SFS) 285–480...