Affiliation:
1. Chonnam National University
2. University of Ottawa
Abstract
The enhancement effects of an intense short-wavelength infrared laser field in a single micrometer-scale metal funnel were observed in harmonic generation experiments. Low-order harmonics were generated by interacting 32-fs pulses centered at the 2.2-µm wavelength with gases in the funnel structures. The driving laser was an optical parametric amplifier operating at 60-kHz repetition rate. When the peak intensity of the laser beam at the entry of the funnel reached 9.1TW/cm2, third-order harmonic signals were detected. The low limits of the enhancement of the driving laser intensity in 10- and 15-µm funnels were estimated to be 32.4 and 20.8, respectively.
Funder
Defense Threat Reduction Agency
Air Force Office of Scientific Research
National Research Foundation of Korea
Canada Excellence Research Chairs, Government of Canada