Open AccessCarrier-envelope phase effects on the spatial coherence of high-order harmonics
Author(s) -
Hanhu Diao,
Yi Zheng,
Zhinan Zhang,
Xiaochun Ge,
Chuang Li,
Ruxin Li,
Zhizhan Xu
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.017657
Subject(s) - carrier envelope phase , coherence (philosophical gambling strategy) , optics , harmonics , phase (matter) , high harmonic generation , phase coherence , envelope (radar) , degree of coherence , physics , coherence length , chirp , laser , telecommunications , computer science , radar , quantum mechanics , superconductivity , voltage , condensed matter physics
In this work, we report the Carrier-Envelope Phase Effects on the Spatial Coherence of High-order Harmonics driven by phase-stabilized few-cycle mid-infrared laser pulses. The degree of coherence varies with carrier-envelope phase periodically with a period of π. At the same time, as the harmonic orders increase, the extreme points on the curve of coherence degree vs. carrier-envelope phase shift toward the direction of carrier-envelope phase increasing. Through theoretical analysis, we find that the ionization induced frequency chirp plays an important role in the Carrier-Envelope Phase Effects on the Spatial Coherence. This effect suggests a possible method to optimize the spatial coherence of harmonics by tuning the carrier-envelope phase of the driving field.