DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Necklace-structured high-harmonic generation for low-divergence, soft x-ray harmonic combs with tunable line spacing

Journal Article · · Science Advances

The extreme nonlinear optical process of high-harmonic generation (HHG) makes it possible to map the properties of a laser beam onto a radiating electron wave function and, in turn, onto the emitted x-ray light. Bright HHG beams typically emerge from a longitudinal phased distribution of atomic-scale quantum antennae. Here, we form a transverse necklace-shaped phased array of linearly polarized HHG emitters, where orbital angular momentum conservation allows us to tune the line spacing and divergence properties of extreme ultraviolet and soft x-ray high-harmonic combs. The on-axis HHG emission has extremely low divergence, well below that obtained when using Gaussian driving beams, which further decreases with harmonic order. This work provides a new degree of freedom for the design of harmonic combs—particularly in the soft x-ray regime, where very limited options are available. Such harmonic beams can enable more sensitive probes of the fastest correlated charge and spin dynamics in molecules, nanoparticles, and materials.

Research Organization:
Univ. of Colorado, Boulder, CO (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation Physics Frontier Center; National Science Foundation Graduate Research Fellowships
Grant/Contract Number:
FG02-99ER14982
OSTI ID:
1907652
Journal Information:
Science Advances, Journal Name: Science Advances Journal Issue: 5 Vol. 8; ISSN 2375-2548
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English

References (55)

X‐Ray Absorption and X‐Ray Emission Spectroscopy book January 2016
Adaptive optics compensation of orbital angular momentum beams with a modified Gerchberg–Saxton-based phase retrieval algorithm journal December 2017
Information multiplexing in ptychography journal March 2014
Shaped-pulse optimization of coherent emission of high-harmonic soft X-rays journal July 2000
0.5-keV Soft X-ray attosecond continua journal May 2016
Synthesis and characterization of attosecond light vortices in the extreme ultraviolet journal August 2016
Controlling the orbital angular momentum of high harmonic vortices journal April 2017
Tunable orbital angular momentum in high-harmonic generation journal April 2017
First lasing and operation of an ångstrom-wavelength free-electron laser journal August 2010
The attosecond nonlinear optics of bright coherent X-ray generation journal November 2010
A compact X-ray free-electron laser emitting in the sub-ångström region journal June 2012
Non-collinear generation of angularly isolated circularly polarized high harmonics journal September 2015
Strong-field physics with singular light beams journal August 2012
Controlling the polarization and vortex charge of attosecond high-harmonic beams via simultaneous spin–orbit momentum conservation journal December 2018
Laguerre–Gauss and Hermite–Gauss soft X-ray states generated using diffractive optics journal January 2019
Dynamics of necklace beams in nonlinear colloidal suspensions journal September 2017
Arbitrary manipulation of spatial amplitude and phase using phase-only spatial light modulators journal December 2014
Handbook of Mathematical Functions, with Formulas, Graphs, and Mathematical Tables journal January 1966
Bright circularly polarized soft X-ray high harmonics for X-ray magnetic circular dichroism journal November 2015
Spatiotemporal coupling of attosecond pulses journal March 2019
Real-time probing of chirality during a chemical reaction journal November 2019
Coherent modulation of the electron temperature and electron–phonon couplings in a 2D material journal April 2020
The physics of attosecond light pulses journal May 2004
Multiple-harmonic conversion of 1064 nm radiation in rare gases journal February 1988
Advances in attosecond science journal February 2016
Roadmap on structured light journal November 2016
Mechanical Detection and Measurement of the Angular Momentum of Light journal July 1936
Orbital angular momentum of light and the transformation of Laguerre-Gaussian laser modes journal June 1992
Theory of high-harmonic generation by low-frequency laser fields journal March 1994
Polarization-dependent high-order two-color mixing journal May 1995
Temporal phase control of soft-x-ray harmonic emission journal July 1998
High-order harmonic propagation in gases within the discrete dipole approximation journal September 2010
Coherent Water Window X Ray by Phase-Matched High-Order Harmonic Generation in Neutral Media journal December 2008
Bright, Coherent, Ultrafast Soft X-Ray Harmonics Spanning the Water Window from a Tabletop Light Source journal October 2010
Zeptosecond High Harmonic keV X-Ray Waveforms Driven by Midinfrared Laser Pulses journal July 2013
Attosecond Extreme Ultraviolet Vortices from High-Order Harmonic Generation journal August 2013
Creating High-Harmonic Beams with Controlled Orbital Angular Momentum journal October 2014
Nonperturbative Twist in the Generation of Extreme-Ultraviolet Vortex Beams journal October 2016
Generation of Coherent Soft X Rays at 2.7 nm Using High Harmonics journal October 1997
Self-Trapping of “Necklace” Beams in Self-Focusing Kerr Media journal November 1998
Collapse and Stability of Necklace Beams in Kerr Media journal September 2007
High-flux soft x-ray harmonic generation from ionization-shaped few-cycle laser pulses journal May 2018
Optics-less focusing of XUV high-order harmonics journal April 2019
Generation of Spatially Coherent Light at Extreme Ultraviolet Wavelengths journal July 2002
Bright Coherent Ultrahigh Harmonics in the keV X-ray Regime from Mid-Infrared Femtosecond Lasers journal June 2012
Generation of Coherent X-rays in the Water Window Using 5-Femtosecond Laser Pulses journal October 1997
Phase-Matched Generation of Coherent Soft X-rays journal May 1998
Beyond crystallography: Diffractive imaging using coherent x-ray light sources journal April 2015
Ultraviolet surprise: Efficient soft x-ray high-harmonic generation in multiply ionized plasmas journal December 2015
Direct time-domain observation of attosecond final-state lifetimes in photoemission from solids journal June 2016
Time-resolved x-ray absorption spectroscopy with a water window high-harmonic source journal January 2017
Generation of extreme-ultraviolet beams with time-varying orbital angular momentum journal June 2019
Studies of multiphoton production of vacuum-ultraviolet radiation in the rare gases journal January 1987
Trains of attosecond pulses structured with time-ordered polarization states journal October 2020
Pre-turbulence compensation of orbital angular momentum beams based on a probe and the Gerchberg–Saxton algorithm journal January 2016