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

Michael Renxun Wang, Xu Guang Huang

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

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%.

Original languageEnglish
Pages (from-to)2171-2176
Number of pages6
JournalApplied Optics
Volume38
Issue number11
StatePublished - Apr 10 1999

Fingerprint

Diffractive optical elements
Gaussian beams
Optical disk storage
Diffraction
Lasers
Energy conversion
Conversion efficiency
Etching
Lenses
Wavelength
energy conversion efficiency
optical disks
diffraction
lasers
lenses
etching
thresholds
wavelengths

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Subwavelength-resolvable focused non-Gaussian beam shaped with a binary diffractive optical element. / Wang, Michael Renxun; Huang, Xu Guang.

In: Applied Optics, Vol. 38, No. 11, 10.04.1999, p. 2171-2176.

Research output: Contribution to journalArticle

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