TY - JOUR
AU - Pei-Chi Huang
AU - Carlos Hernández-García
AU - Jen-Ting Huang
AU - Po-Yao Huang
AU - Chih-Hsuan Lu
AU - Laura Rego
AU - Daniel Hickstein
AU - Jennifer Ellis
AU - Agnieszka Jaron-Becker
AU - Andreas Becker
AU - Shang- Da Yang
AU - Charles Durfee
AU - Luis Plaja
AU - Henry Kapteyn
AU - Margaret Murnane
AU - A. Kung
AU - Ming-Chang Chen
AB - High-harmonic generation driven by femtosecond lasers makes it possible to capture the fastest dynamics in molecules and materials. However, thus far, the shortest isolated attosecond pulses have only been produced with linear polarization, which limits the range of physics that can be explored. Here, we demonstrate robust polarization control of isolated extreme-ultraviolet pulses by exploiting non-collinear high-harmonic generation driven by two counter-rotating few-cycle laser beams. The circularly polarized supercontinuum is produced at a central photon energy of 33 eV with a transform limit of 190 as and a predicted linear chirp of 330 as. By adjusting the ellipticity of the two counter-rotating driving pulses simultaneously, we control the polarization state of isolated extreme-ultraviolet pulses--from circular through elliptical to linear polarization--without sacrificing conversion efficiency. Access to the purely circularly polarized supercontinuum, combined with full helicity and ellipticity control, paves the way towards attosecond metrology of circular dichroism.
BT - Nature Photonics
DA - 2018-04
DO - 10.1038/s41566-018-0145-0
N2 - High-harmonic generation driven by femtosecond lasers makes it possible to capture the fastest dynamics in molecules and materials. However, thus far, the shortest isolated attosecond pulses have only been produced with linear polarization, which limits the range of physics that can be explored. Here, we demonstrate robust polarization control of isolated extreme-ultraviolet pulses by exploiting non-collinear high-harmonic generation driven by two counter-rotating few-cycle laser beams. The circularly polarized supercontinuum is produced at a central photon energy of 33 eV with a transform limit of 190 as and a predicted linear chirp of 330 as. By adjusting the ellipticity of the two counter-rotating driving pulses simultaneously, we control the polarization state of isolated extreme-ultraviolet pulses--from circular through elliptical to linear polarization--without sacrificing conversion efficiency. Access to the purely circularly polarized supercontinuum, combined with full helicity and ellipticity control, paves the way towards attosecond metrology of circular dichroism.
PY - 2018
SP - 349
EP - 354
T2 - Nature Photonics
TI - Polarization control of isolated high-harmonic pulses
UR - https://www.nature.com/articles/s41566-018-0145-0
VL - 12
SN - 1749-4885
ER -