Wavelength scaling of terahertz pulse energies delivered by two-color air plasmas
Artikel i vetenskaplig tidskrift, 2019

We address the long-standing problem of anomalous growth observed in the terahertz (THz) energy yield from air plasmas created by two-color laser pulses, as the fundamental wavelength λ 0 is increased. Using two distinct optical parametric amplifiers (OPAs), we report THz energies scaling like λ α0 with large exponents 5.6 ≤ α ≤ 14.3, which departs from the growth in λ 20 expected from photocurrent theory. By means of comprehensive 3D simulations, we demonstrate that the changes in the laser beam size, pulse duration, and phase-matching conditions in the second-harmonic generation process when tuning the OPA’s carrier wavelength can lead to these high scaling powers. The value of the phase angle between the two colors reached at the exit of the doubling crystal turns out to be crucial and even explains non-monotonic behaviors in the measurements.


Alisée Nguyen

Le Commissariat à l’Énergie Atomique et aux Énergies Alternatives (CEA)

K. J. Kaltenecker

Danmarks Tekniske Universitet (DTU)

J. C. Delagnes

Université de Bordeaux

Binbin Zhou

Danmarks Tekniske Universitet (DTU)

E. Cormier

Université de Bordeaux

N. Fedorov

Université de Bordeaux

R. Bouillaud

Université de Bordeaux

D. Descamps

Université de Bordeaux

Illia Thiele

Chalmers, Fysik, Subatomär fysik och plasmafysik

Stefan Skupin

Université de Lyon

P. U. Jepsen

Danmarks Tekniske Universitet (DTU)

Luc Bergé

Le Commissariat à l’Énergie Atomique et aux Énergies Alternatives (CEA)

Optics Letters

0146-9592 (ISSN) 1539-4794 (eISSN)

Vol. 44 6 1488-1491


Acceleratorfysik och instrumentering

Atom- och molekylfysik och optik

Annan fysik





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