Abstract
We present an efficient concept for generating carrier-envelope phase stable pulses tunable between 1.6 and 2.0 μm with durations down to 8.2 fs based on nonlinear frequency conversion. As a first application we measure the high nonlinearity of multiphoton photoemission from a nanoscale metal tip.
Highlights
We present an efficient and simple scheme for the generation of such pulses with a duration around 10 fs and energies on the order of 100 nJ at a repetition rate of 100 kHz [3]
Our concept is based on supercontinuum generation (SCG) in bulk material followed by noncollinear optical parametric amplification for the generation of a broadband visible spectrum, and subsequent broadband difference frequency generation (DFG) with the narrow-band pump laser to generate the passively carrier-envelope phase (CEP) stabilized output around 1.8 μm
The 1025 nm light remaining after frequency doubling is rotated in polarization by 90°. It is focused into a 0.8 mm thick BBO crystal together with the compressed NOPA output to perform type-I DFG to the infrared
Summary
The generation of few-cycle light pulses with stable carrier-envelope phase (CEP) at wavelengths around 2 μm is still a challenging but worthwhile task [1]. In the CEP-sensitive emission of electrons from metal nanostructures, where pulse energies of only 240 pJ at 800 nm sufficed to generate electrons with kinetic energies of up to 13 eV, the use of longer wavelengths is expected to greatly enhance electron energies and to give further insight into the interplay between multiphoton and tunneling ionization [2] For investigations along these lines, CEP stable sub-two-cycle pulses with high repetition rates are a promising tool. The 1025 nm light remaining after frequency doubling is rotated in polarization by 90° It is focused into a 0.8 mm thick BBO crystal together with the compressed NOPA output to perform type-I DFG to the infrared. This scheme even allows compensating for material dispersion in the infrared, introduced by, e.g., an entrance window to a vacuum chamber
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