Single femtosecond pulse writing of a bifocal lens

LETO / LETO-3 Spatial Light Modulators
Materials Processing / Optical Fabrication
Published on:
Authors: Xu Zhang, Lei Wang, Xiao-Wen Cao, Shu Jiang, Yan-Hao Yu, Wei-Wei Xu, Saulius Juodkazis, and Qi-Dai Chen
Abstract:

In this Letter, a method for the fabrication of bifocal lenses is presented by combining surface ablation and bulk modification in a single laser exposure followed by the wet etching processing step. The intensity of a single femtosecond laser pulse was modulated axially into two foci with a designed computer-generated hologram (CGH). Such pulse simultaneously induced an ablation region on the surface and a modified volume inside the fused silica. After etching in hydrofluoric acid (HF), the two exposed regions evolved into a bifocal lens. The area ratio (diameter) of the two lenses can be flexibly adjusted via control of the pulse energy distribution through the CGH. Besides, bifocal lenses with a center offset as well as convex lenses were obtained by a replication technique. This method simplifies the fabrication of micro-optical elements and opens a highly efficient and simple pathway for complex optical surfaces and integrated imaging systems.

Restricted Access

Publication: Optics Letters
Issue/Year: Optics Letters, Vol. 49, Issue 4, pp. 911-914 (2024)
DOI: 10.1364/OL.515811
Link: https://doi.org/10.1364/OL.515811

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