Single femtosecond pulse writing of a bifocal lens

Author:

Zhang Xu,Wang LeiORCID,Cao Xiao-Wen,Jiang Shu1,Yu Yan-Hao,Xu Wei-Wei2,Juodkazis Saulius34ORCID,Chen Qi-DaiORCID

Affiliation:

1. Beijing Institute of Technology

2. Jilin Engineering Normal University

3. Swinburne University of Technology

4. Melbourne Centre for Nanofabrication

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.

Funder

Key R&D Program of Shandong Province, China

National Natural Science Foundation of China

Natural Science Foundation of Jilin Province

Publisher

Optica Publishing Group

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