用于激光束聚焦的连续浮雕衍射微透镜。

Continuous-relief diffractive microlenses for laser beam focusing.

作者信息

Day Matthew, Choonee Kaushal, Cox David, Thompson Mark, Marshall Graham, Sinclair Alastair G

出版信息

Opt Express. 2017 Oct 30;25(22):26987-26999. doi: 10.1364/OE.25.026987.

DOI:10.1364/OE.25.026987

Abstract

Microscale, continuous-profile, diffractive lenses have been fabricated and characterized. Lenses designed to operate at λ = 405 nm were created by focused ion beam milling of a glass substrate. The micro-structured profile was analysed by confocal microscopy and optical performance was quantified by measurements of the transmitted laser beam profile. Lenses of size 125 μm × 125 μm, containing up to 18 annuli and focusing at 400 μm, 450 μm and 500 μm have been made. Measured focused beams were in excellent agreement with the predicted performance. A maximum diffraction efficiency of 84 % and side-lobe suppression down to the 10 level can be achieved. The suitability of the lenses for interfacing with trappedion systems is outlined.

摘要

已制造并表征了微尺度、连续轮廓的衍射透镜。通过对玻璃基板进行聚焦离子束铣削，制造出了设计用于在λ = 405 nm波长下工作的透镜。通过共聚焦显微镜分析微结构轮廓，并通过测量透射激光束轮廓来量化光学性能。已制作出尺寸为125μm×125μm、包含多达18个环带且焦距分别为400μm、450μm和500μm的透镜。测量得到的聚焦光束与预测性能高度吻合。可实现高达84%的最大衍射效率以及低至10⁻⁶水平的旁瓣抑制。概述了这些透镜与囚禁离子系统接口的适用性。