High average power second harmonic generation in air
Beresna, Martynas, Kazansky, Peter G., Svirko, Yuri, Barkauskas, Martynas and Danielius, Romas (2009) High average power second harmonic generation in air. Applied Physics Letters, 95, 121502. (doi:10.1063/1.3232235).
We demonstrate second harmonic vortex generation in atmospheric pressure air using tightly focused femtosecond laser beam. The circularly polarized ring-shaped beam of the second harmonic is generated in the air by fundamental beam of the same circular polarization, while the linear polarized beam produces two-lobe beam at the second harmonic frequency. The achieved normalized conversion efficiency and average second harmonic power are two orders of magnitude higher compared to those previously reported and can be increased up to 20 times by external gas flow. We demonstrate that the frequency doubling originates from the gradient of photoexcited free electrons created by pondermotive force.
|Subjects:||T Technology > TK Electrical engineering. Electronics Nuclear engineering
Q Science > QC Physics
|Divisions:||University Structure - Pre August 2011 > Optoelectronics Research Centre
|Date Deposited:||15 Mar 2010|
|Last Modified:||08 Jun 2012 12:50|
|Contributors:||Beresna, Martynas (Author)
Kazansky, Peter G. (Author)
Svirko, Yuri (Author)
Barkauskas, Martynas (Author)
Danielius, Romas (Author)
|Date:||21 September 2009|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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