Second-harmonic flat-top beam shaping via a three-dimensional nonlinear photonic crystal.
Opt Lett
; 49(4): 1097-1100, 2024 Feb 15.
Article
em En
| MEDLINE
| ID: mdl-38359262
ABSTRACT
We experimentally extend the nonlinear Gaussian to flat-top beam shaping from one to two dimensions through a three-dimensional nonlinear photonic crystal. Employing a near-infrared femtosecond laser, we induce a modification inside lithium niobate to achieve a second-order nonlinear optical coefficient modulation in three dimensions. The flat-topped truncation of wavefront has been adjusted in a mutual perpendicular coordinate separately. Among the generated flat-topped beams, the optimal flatness is 97.1%, and the nonlinear conversion efficiency is 10-2 at the peak power of 37â
kW with the interaction length of 630â
µm. By adding an extra dimension, our work simultaneously enables full-wavefront flat-top distribution and nonlinear frequency conversion.
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MEDLINE
Idioma:
En
Revista:
Opt Lett
Ano de publicação:
2024
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Article