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 language | English |
|---|---|
| Pages (from-to) | 2171-2176 |
| Number of pages | 6 |
| Journal | Applied Optics |
| Volume | 38 |
| Issue number | 11 |
| State | Published - Apr 10 1999 |
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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 journal › Article
}
TY - JOUR
T1 - Subwavelength-resolvable focused non-Gaussian beam shaped with a binary diffractive optical element
AU - Wang, Michael Renxun
AU - Huang, Xu Guang
PY - 1999/4/10
Y1 - 1999/4/10
N2 - 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%.
AB - 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%.
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UR - http://www.scopus.com/inward/citedby.url?scp=0000322397&partnerID=8YFLogxK
M3 - Article
C2 - 18319777
AN - SCOPUS:0000322397
VL - 38
SP - 2171
EP - 2176
JO - Applied Optics
JF - Applied Optics
SN - 1559-128X
IS - 11
ER -