利用双色泵浦和1kHz钛宝石激光脉冲的啁啾变化增强等离子体中的高次谐波。

Enhancement of high harmonics from plasmas using two-color pump and chirp variation of 1 kHz Ti:sapphire laser pulses.

作者信息

Ganeev R A, Hutchison C, Zaïr A, Witting T, Frank F, Okell W A, Tisch J W G, Marangos J P

机构信息

Blackett Laboratory, Imperial College London, London SW7 2BW, UK.

出版信息

Opt Express. 2012 Jan 2;20(1):90-100. doi: 10.1364/OE.20.000090.

DOI:10.1364/OE.20.000090

PMID:22274332

Abstract

We have investigated resonance effects in high-order harmonic generation (HHG) within laser-produced plasmas. We demonstrate a significantly improved harmonic yield by using two-color pump-induced enhancement and a 1 kHz pulse repetition rate. Together with an increased HHG output, the even harmonics in the cutoff region were enhanced with respect to odd harmonics. We report the observation of a resonance-induced growth in intensity of 20th harmonic in silver plasma (2×), 26th harmonic in vanadium plasma (4×), and 28th harmonic in chromium plasma (5×).

摘要

我们研究了激光产生的等离子体中高次谐波产生（HHG）的共振效应。我们通过使用双色泵浦诱导增强和1kHz的脉冲重复率，证明了谐波产率有显著提高。随着HHG输出的增加，截止区域的偶次谐波相对于奇次谐波得到了增强。我们报告了在银等离子体中第20次谐波强度共振诱导增长（2倍）、钒等离子体中第26次谐波强度共振诱导增长（4倍）以及铬等离子体中第28次谐波强度共振诱导增长（5倍）的观测结果。