Generation of Bright Phase-matched Circularly-polarized Extreme Ultraviolet High Harmonics
Abstract
Circularly-polarized extreme ultraviolet and X-ray radiation is useful for analysing the structural, electronic and magnetic properties of materials. To date, such radiation has only been available at large-scale X-ray facilities such as synchrotrons. Here, we demonstrate the first bright, phase-matched, extreme ultraviolet circularly-polarized high harmonics source. The harmonics are emitted when bi-chromatic counter-rotating circularly-polarized laser pulses field-ionize a gas in a hollow-core waveguide. We use this new light source for magnetic circular dichroism measurements at the M shell absorption edges of Co. We show that phase-matching of circularly-polarized harmonics is unique and robust, producing a photon fl ux comparable to linearly polarized high harmonic sources. This work represents a critical advance towards the development of table-top systems for element-specific imaging and spectroscopy of multiple elements simultaneously in magnetic and other chiral media with very high spatial and temporal resolution.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 08, 2014
- Accession Number
- ADA619293
Entities
People
- Avner Fleischer
- Dimitar Popmintchev
- Dmitriy Zusin
- Emrah Turgut
- Hans Nembach
- Justin M Shaw
- Ofer Kfir
- Patrik Grychtol
- Ronny Knut
- Tenio Popmintchev
Organizations
- University of Colorado Boulder