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High average power second harmonic generation in air

High average power second harmonic generation in air
High average power second harmonic generation in air
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.
0003-6951
121502
Beresna, Martynas
a6dc062e-93c6-46a5-aeb3-8de332cdec7b
Kazansky, Peter G.
a5d123ec-8ea8-408c-8963-4a6d921fd76c
Svirko, Yuri
beb25cef-3c46-498d-974f-bba4929f0b6a
Barkauskas, Martynas
dccb3452-a09e-4384-84ba-5d26ca289132
Danielius, Romas
83ca3d11-54ae-44bb-b028-c98389b37b68
Beresna, Martynas
a6dc062e-93c6-46a5-aeb3-8de332cdec7b
Kazansky, Peter G.
a5d123ec-8ea8-408c-8963-4a6d921fd76c
Svirko, Yuri
beb25cef-3c46-498d-974f-bba4929f0b6a
Barkauskas, Martynas
dccb3452-a09e-4384-84ba-5d26ca289132
Danielius, Romas
83ca3d11-54ae-44bb-b028-c98389b37b68

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).

Record type: Article

Abstract

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.

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Published date: 21 September 2009

Identifiers

Local EPrints ID: 78871
URI: https://eprints.soton.ac.uk/id/eprint/78871
ISSN: 0003-6951
PURE UUID: 71391e5f-e26b-4f23-8e64-690c4c88be8c

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Date deposited: 15 Mar 2010
Last modified: 19 Jul 2019 23:36

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