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Subwavelength-resolvable focused non-Gaussian beam shaped with a binary diffractive optical element

机译：具有二元衍射光学元件的亚波长可分辨聚焦非高斯光束

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摘要

The diffraction-limited spot size limits the optical disk storage capacity and microscopic resolution. We describe a technique to shape a focused Gaussian beam into a superresolving beam by using a diffractive optical element fabricated by laser-assisted chemical etching. The focused shaped beam has a smaller width and a longer depth of focus than a similarly focused Gaussian beam. Using the diffraction-limited shaped beam along with threshold writing, we achieved a written pit size of less than 0.33 μm at a 695-nm laser wavelength, compared with a 0.7-μm focused Gaussian spot size (full width at e~(－2) of the peak) with the same focusing lens. The energy conversion efficiency for the beam shaping was ～81%.
机译：受衍射限制的光点大小限制了光盘的存储容量和显微分辨率。我们描述了一种通过使用激光辅助化学刻蚀制造的衍射光学元件将聚焦的高斯光束成形为超分辨光束的技术。聚焦的成形光束比类似聚焦的高斯光束具有更小的宽度和更长的聚焦深度。使用衍射极限成形光束和阈值写入，我们在695nm的激光波长下实现了小于0.33μm的写入凹坑尺寸，而聚焦后的高斯光斑尺寸为0.7μm（在e〜（－2 ）的峰值）。光束整形的能量转换效率为〜81％。

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