由三到十五阶奇次谐波增强的中红外到中紫外超连续谱

Mid-infrared-to-mid-ultraviolet supercontinuum enhanced by third-to-fifteenth odd harmonics.

作者信息

Mitrofanov A V, Voronin A A, Mitryukovskiy S I, Sidorov-Biryukov D A, Pugžlys A, Andriukaitis G, Flöry T, Stepanov E A, Fedotov A B, Baltuška A, Zheltikov A M

出版信息

Opt Lett. 2015 May 1;40(9):2068-71. doi: 10.1364/OL.40.002068.

DOI:10.1364/OL.40.002068

PMID:25927786

Abstract

A high-energy supercontinuum spanning 4.7 octaves, from 250 to 6500 nm, is generated using a 0.3-TW, 3.9-μm output of a mid-infrared optical parametric chirped-pulse amplifier as a driver inducing a laser filament in the air. The high-frequency wing of the supercontinuum spectrum is enhanced by odd-order optical harmonics of the mid-infrared driver. Optical harmonics up to the 15th order are observed in supercontinuum spectra as overlapping, yet well-resolved peaks broadened, as verified by numerical modeling, due to spatially nonuniform ionization-induced blue shift.

摘要

利用中红外光参量啁啾脉冲放大器输出的0.3太瓦、3.9微米的光作为驱动源，在空气中诱导产生激光细丝，从而产生了覆盖4.7个倍频程（从250纳米至6500纳米）的高能超连续谱。超连续谱的高频边带通过中红外驱动源的奇次光学谐波得到增强。在超连续谱中观察到高达15阶的光学谐波，这些谐波以重叠但仍可分辨的峰的形式出现，峰变宽，经数值模拟验证，这是由于空间非均匀电离诱导的蓝移所致。