scholarly journals Polarization Dependent Excitation and High Harmonic Generation from Intense Mid-IR Laser Pulses in ZnO

Nanomaterials ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 4
Author(s):  
Richard Hollinger ◽  
Paul Herrmann ◽  
Viacheslav Korolev ◽  
Maximilian Zapf ◽  
Valentina Shumakova ◽  
...  

The generation of high order harmonics from femtosecond mid-IR laser pulses in ZnO has shown great potential to reveal new insight into the ultrafast electron dynamics on a few femtosecond timescale. In this work we report on the experimental investigation of photoluminescence and high-order harmonic generation (HHG) in a ZnO single crystal and polycrystalline thin film irradiated with intense femtosecond mid-IR laser pulses. The ellipticity dependence of the HHG process is experimentally studied up to the 17th harmonic order for various driving laser wavelengths in the spectral range 3–4 µm. Interband Zener tunneling is found to exhibit a significant excitation efficiency drop for circularly polarized strong-field pump pulses. For higher harmonics with energies larger than the bandgap, the measured ellipticity dependence can be quantitatively described by numerical simulations based on the density matrix equations. The ellipticity dependence of the below and above ZnO band gap harmonics as a function of the laser wavelength provides an efficient method for distinguishing the dominant HHG mechanism for different harmonic orders.

2019 ◽  
Vol 205 ◽  
pp. 02025
Author(s):  
Richard Hollinger ◽  
Valentina Shumakova ◽  
Audrius Pugžlys ◽  
Andrius Baltuška ◽  
Sherzod Khujanov ◽  
...  

Ultrafast coherent phonon dynamics in ZnO is studied via high-order harmonic generation by intense mid-IR laser pulses. We show, the phonon dynamic is very different after excitation in the tunnel and multiphoton regime.


2021 ◽  
Vol 75 (7) ◽  
Author(s):  
H. Chomet ◽  
C. Figueira de Morisson Faria

Abstract We provide a brief review of how phase space techniques are explored within strong-field and attosecond science. This includes a broad overview of the existing landscape, with focus on strong-field ionisation and rescattering, high-order harmonic generation, stabilisation and free-electron lasers. Furthermore, using our work on the subject, which deals with ionisation dynamics in atoms and diatomic molecules as well as high-order harmonic generation in inhomogeneous fields, we exemplify how such tools can be employed. One may for instance determine qualitatively different phase space dynamics, explore how bifurcations influence ionisation and high-harmonic generation, establish for which regimes classical and quantum correspondence works or fails, and what role different timescales play. Finally, we conclude the review highlighting the importance of the tools available in quantum optics, quantum information and physical chemistry to strong-field laser–matter interaction. Graphic Abstract


1995 ◽  
Vol 04 (03) ◽  
pp. 567-594 ◽  
Author(s):  
K. MIYAZAKI

High-order harmonic generation experiments using intense, femtosecond dye (616 nm), XeCl (308 nm) and Ti:sapphire (782 nm) laser pulses are reviewed. Results obtained at focused intensities of 1013 ~ 1015 W/cm 2 have shown characteristic behaviors of the high-order harmonic and its distribution which depend on the laser wavelength, the laser intensity and the rare gas used as the nonlinear medium. Interaction processes for the efficient generation of high-order harmonics or short-wavelength coherent radiation in the multiphoton and tunneling ionization regimes are discussed based on the results obtained.


2007 ◽  
Author(s):  
D. Comtois ◽  
H.-C. Bandulet ◽  
E. Bisson ◽  
A. Borowiec ◽  
H. Pépin ◽  
...  

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