Nanoscale amplification of non-linear processes in solid-state devices opens novel applications in nano-electronics, nano-medicine or high energy conversion for example. Coupling few nano-joules laser energy at a nanometer scale for strong field physics is demonstrated. We report enhancement of high harmonic generation in nano-structured semiconductors using nanoscale amplification of a mid-infrared laser in the sample rather than using large laser amplifier systems. Field amplification is achieved through light confinement in nano-structured semiconductor 3D waveguides. The high harmonic nano-converter consists of an array of zinc-oxide nanocones. They exhibit a large amplification volume, 6 orders of magnitude larger than previously reported  and avoid melting observed in metallic plasmonic structures. The amplification of high harmonics is observed by coupling only 5-10 nano-joules of a 3.2 µm high repetition-rate OPCPA laser at the entrance of each nanocone. Harmonic amplification (factor 30) depends on the laser energy input, wavelength and nanocone geometry .
 Vampa et al., Nat. Phys. 13, 659–662 (2017).
 Franz et al., arXiv:1709.09153 [physics.optics] (2017)
We review recent developments in the generation and metrology of XUV-attosecond (as) pulses. The review includes an extended report on the recently achieved 2<sup>nd</sup>-order autocorrelation measurement of a sub-femtosecond (sub-fs) pulse train.
Conference Committee Involvement (1)
Commercial and Biomedical Applications of Ultrafast Lasers VII
21 January 2007 | San Jose, California, United States