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2022 ◽  
Vol 93 (1) ◽  
pp. 015006
Author(s):  
Xiaolong Zhao ◽  
Ming Ye ◽  
Zhi Cao ◽  
Danyang Huang ◽  
Tingting Fan ◽  
...  

2021 ◽  
pp. 114413
Author(s):  
Toshihiro Nakamura ◽  
Tomoaki Nishimura ◽  
Kazuo Kuriyama ◽  
Tohru Nakamura ◽  
Atsushi Kinomura

2021 ◽  
pp. 126240
Author(s):  
Melvin John F. Empizoa ◽  
Kohei Yamanoi ◽  
Yuki Abe ◽  
Keito Shinohara ◽  
Verdad C. Agulto ◽  
...  

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.


2020 ◽  
Vol 152 (7) ◽  
pp. 074705
Author(s):  
Elin Grånäs ◽  
Björn Arndt ◽  
Christoph Seitz ◽  
Michael Wagstaffe ◽  
Andreas Stierle

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