2015 Fiscal Year Final Research Report
Generation of a super-resolution laser beam producing an extremely small focal spot
| Project/Area Number |
25790062
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Optical engineering, Photon science
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| Research Institution | Tohoku University |
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Principal Investigator |
Kozawa Yuichi 東北大学, 多元物質科学研究所, 助教 (90509126)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Keywords | レーザー共振器 / 偏光 / レーザー顕微鏡 |
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| Outline of Final Research Achievements |
A laser beam with an annular-shape and radial polarization, which can produce a small focal spot, was generated directly from a laser cavity. The generation of an annular-shaped beam with radial polarization was demonstrated simply by the precise control of the cavity length and optics in a plane-concave cavity with a c-cut Nd:YVO4 crystal.
We also demonstrated a further simplified method that enables the manipulation of the intensity and polarization distribution of a laser beam by the fine structure of gold ring patterns fabricated on the surface of a laser crystal.
In addition, we investigated the image formation for a small scatterer illuminated by a radially polarized beam in laser microscopy, which revealed a new approach for the enhancement of the spatial resolution in laser microscopy using a radially polarized beam.
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| Free Research Field |
光工学
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