Journal
JOURNAL OF OPTICS
Volume 20, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2040-8986/aa9b04
Keywords
frequency conversion; harmonic generation; including higher-order harmonic generation; ultrafast processes; optical pulse generation and pulse compression; optical parametric oscillators and amplifiers
Categories
Funding
- European Research Council (Grant PALP)
- European Union's Horizon research and innovation programme under the Marie Sklodowska-Curie grant [641789]
- Knut and Alice Wallenberg Foundation
- Swedish Research Council
- Laserlab-Europe EU-H [654148]
- Swedish Foundation for Strategic Research
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We present efficient high-order harmonic generation (HHG) based on a high-repetition rate, few-cycle, near infrared (NIR), carrier-envelope phase stable, optical parametric chirped pulse amplifier (OPCPA), emitting 6 fs pulses with 9 mu J pulse energy. In krypton, we reach conversion efficiencies from the NIR to the extreme ultraviolet (XUV) radiation pulse energy on the order of similar to 10(-6) with less than 3 mu J driving pulse energy. This is achieved by optimizing the OPCPA for a spatially and temporally clean pulse and by a specially designed high-pressure gas target. In the future, the high efficiency of the HHG source will be beneficial for high-repetition rate two-colour (NIR-XUV) pump-probe experiments, where the available pulse energy from the laser has to be distributed economically between pump and probe pulses.
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