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During the exploration of nonlinear crystal, such as BaMgF4 crystal for all-solid-state lasers in the vacuum ultraviolet region, many problems emerged in the scattering centers. These were caused by immature crystal-growth technology, which may bring difficulties to the periodic poling process for quasi-phase-matching. In previous studies, research has shown that nonlinear random materials can also be used for frequency conversion. In this paper, a random nonlinear process was observed when the fundamental wave is illuminated onto the scratch of the BaMgF4 nanocrystal powder film. Then, the second-harmonic waves scattered from the nonlinear turbid media are re-collected to a forward direction using feedback wavefront shaping. The method shows a repeated way to improve the conversion efficiency, which may be viable to improve the second order conversion efficiency of BaMgF4 at other wavelengths, especially in the VUV regime. Additionally, more interesting applications in random nonlinear material, such as nanocrystal ceramics, can be expected in the future.

Enhancement of second harmonic generation by wavefront shaping in the scratch of BaMgF4 nanocrystal powder film

Enhancement of second harmonic generation by wavefront shaping in the scratch of BaMgF₄ nanocrystal powder film