Attosecond interferometry in time-energy domain

November 24, 2020

Space-momentum domain interferometer is a key technique in modern precision measurements, and has been widely for applications that require superb spatial resolution in engineering metrology and astronomy. Extending such interferometric technique to the time-energy domain is a significant complement to spatial domain measurements and is anticipated to provide time resolving capability for tracing ultrafast processes. However, such applications for high precision time domain measurement, especially the state of the art attosecond time resolved measurement is less explored despite its great significance.

Recently, the ultrafast optics team from Huazhong University of Science and Technology in China made exciting progress and developed an all-optical attosecond few slit interferometer and demonstrated its applications in time-energy domain high precision measurement. It is based on laser driven high order harmonics, which is essentially a time domain Young's interferometer with the attosecond pulse train as the diffraction slits. By introducing an external weak field to perturb the harmonic generation process, the phase of the attosecond temporal slits changes resulting in a noticeable energy shift of the harmonics. The authors have derived a simple intuitive formula to depict the energy shift induced by the perturbing field, from which a wave-front controlled attosecond interferometry preserving attosecond temporal resolution and hundreds of meV energy resolution is implemented.

As the first application, the authors utilized the time resolving capability of the interferometer for real-time probing of a petahertz electromagnetic field. The strong field approximation analysis shows that the energy shift of the harmonics is proportional to a linear combination of two delayed perturbing pulses. Following a trivial Fourier analysis, the electric field of the perturbing pulse can be readily retrieved. Such method can be easily generalized for reconstructing signals with an arbitrary state of polarization

As the second application, the authors utilized the energy resolving capability of the interferometer to interrogate the abnormal phase jump of the transition dipole near a Cooper minimum in argon. When multiple harmonics are considered simultaneously, the time separation of attosecond slits becomes trackable in an energy resolved manner, and the reshaping of EUV temporal structure near a Cooper minimum in argon is clearly revealed. This novel attosecond interferometry has extended the interferometer-based high precision measurement to time-energy domain with an all-optical approach. It can potentially find significant applications in probing structural dynamics of complex targets.
See the article: Zhen Yang, Wei Cao, Yunlong Mo, Huiyao Xu, Kang Mi, Pengfei Lan, Qingbin Zhang, Peixiang Lu All-optical attosecond time domain interferometry National Science Review, nwaa211

Science China Press

Related Electric Field Articles from Brightsurf:

Charging electric cars up to 90% in 6 minutes
POSTECH Professor Byoungwoo Kang's research team uncovers a new Li-ion battery electrode material that can achieve high-energy density and high power capability per volume without reducing particle size.

uOttawa researchers find cheaper, faster way to measure the electric field of light
Researchers at the University of Ottawa have created a new method to measure the temporal evolution of electric fields with optical frequencies.

How dangerous are burning electric cars?
What happens if an electric car burns in a road tunnel or an underground car park?

One more hit from rare Earth: Efficient coherent spin manipulation by the electric field
Researchers used rare earth ions to efficiently couple the electric and magnetic behaviors of material.

Battery breakthrough gives boost to electric flight and long-range electric cars
Researchers at the Department of Energy's Lawrence Berkeley National Laboratory (Berkeley Lab), in collaboration with Carnegie Mellon University, have developed a new battery material that could enable long-range electric vehicles that can drive for hundreds of miles on a single charge, and electric planes called eVTOLs for fast, environmentally friendly commutes.

Deterministic reversal of single magnetic vortex circulation by an electric field
Chinese researchers discover a deterministic reversal of magnetic vortex circulation in a Ni79Fe21 (NiFe) island on top of a layered-perovskite Bi2WO6 (BWO) thin film using an electric field.

4D electric circuit network with topology
Researchers from China and Germany have proposed a design scheme to implement a four-dimensional topological insulating state in circuit network, which provides a convenient physical platform for studying high-dimensional states.

How we might recharge an electric car as it drives
Stanford engineers demonstrate a technology that could one day be scaled up to power a car moving down the road.

Electric cars better for climate in 95% of the world
Fears that electric cars could actually increase carbon emissions are unfounded in almost all parts of the world, news research shows.

O-FIB: Far-field-induced near-field breakdown for direct nanowriting in an atmospheric environment
Nanoscale texturing, drilling, cutting and spatial sculpturing require not only high accuracy, but also the capability of manufacturing in the atmospheric environment.

Read More: Electric Field News and Electric Field Current Events is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to