NDLI: Enhancement of high-order harmonic generation efficiency from solid-surface plasma by controlling the electron density gradient of picosecond laser-produced plasmas

Content Provider	IEEE Xplore Digital Library
Author	Ishizawa, A. Kanai, T. Ozaki, T. Kuroda, H.
Copyright Year	1965
Abstract	We have investigated the efficiency of generating the fifth-order harmonic from plasma at the surface of a solid by varying the electron density gradient of the picosecond laser-produced plasmas. In order to modify the plasma scale length, we carried out experiments in which a 2.2 ps prepulse irradiates the solid target 0-20 ps prior to the arrival of the main Nd:glass laser pulse with the same pulse duration. The chirped pulse amplification Nd:glass laser system delivered pulses up to 100 mJ energy at 1054 nm wavelength. Although third-harmonic radiation can also be observed when a single beam is used, a /spl sim/5 ps time delay results in an increase in the harmonic signal by a factor of 2-3, which then decreases after 10 ps. We also have carried out more detailed model-calculations using the simulations. As a result, it is found that it is possible to generate high harmonics efficiency by controlling the density gradient using two laser pulses.
Sponsorship	IEEE Lasers and Electro-Optics Society
Starting Page	384
Ending Page	389
Page Count	6
File Size	137562
File Format	PDF
ISSN	00189197
Volume Number	37
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-03-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Frequency conversion Optical pulses Pulse amplifiers Plasma density Optical harmonic generation Solid lasers Optical pulse generation Surface emitting lasers Electrons Chirp
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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