dorsal/arxiv
View SchemaThe dependence of transverse and longitudinal resolutions on incident Gaussian beam widths in the illumination part of optical scanning microscopy
| Authors | Hyung-Su Chon, Gisung Park, Sang-Bum Lee, Seokchan Yoon, Jaisoon Kim, Jai-Hyung Lee, Kyungwon An |
|---|---|
| Categories | |
| ArXiv ID | physics/0411222 |
| URL | https://arxiv.org/abs/physics/0411222 |
Abstract
We studied both theoretically and experimentally the intensity distribution of a Gaussian laser beam when it was focussed by an objective lens with its numerical-aperture (NA) up to 0.95. Approximate formulae for full widths at half maximum (FWHM) of the intensity distribution at focus were derived for very large and very small initial beam waists with respect to the entrance pupil radius of the objective lens. In experiments the energy flux through a 0.5 micron pinhole was measured for various pinhole positions. We found that the FWHM's at focus in the transverse and the longitudinal directions do not increase much from the ultimate FWHM's until the input beam waist is reduced below the half of the entrance pupil radius. In addition, we observed significance of the spatial distribution of the input beam against a true Gaussian beam profile in the case of small initial beam waist. For high NA with resulting focal beam waists comparable to or smaller than the wavelength of the laser, the interaction between the electric field and the conducting surface of the pinhole caused the transverse FWHM to be measured slightly smaller than FWHM of the unperturbed intensity distribution convoluted with the pinhole opening.
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"abstract": "We studied both theoretically and experimentally the intensity distribution\nof a Gaussian laser beam when it was focussed by an objective lens with its\nnumerical-aperture (NA) up to 0.95. Approximate formulae for full widths at\nhalf maximum (FWHM) of the intensity distribution at focus were derived for\nvery large and very small initial beam waists with respect to the entrance\npupil radius of the objective lens. In experiments the energy flux through a\n0.5 micron pinhole was measured for various pinhole positions. We found that\nthe FWHM\u0027s at focus in the transverse and the longitudinal directions do not\nincrease much from the ultimate FWHM\u0027s until the input beam waist is reduced\nbelow the half of the entrance pupil radius. In addition, we observed\nsignificance of the spatial distribution of the input beam against a true\nGaussian beam profile in the case of small initial beam waist. For high NA with\nresulting focal beam waists comparable to or smaller than the wavelength of the\nlaser, the interaction between the electric field and the conducting surface of\nthe pinhole caused the transverse FWHM to be measured slightly smaller than\nFWHM of the unperturbed intensity distribution convoluted with the pinhole\nopening.",
"arxiv_id": "physics/0411222",
"authors": [
"Hyung-Su Chon",
"Gisung Park",
"Sang-Bum Lee",
"Seokchan Yoon",
"Jaisoon Kim",
"Jai-Hyung Lee",
"Kyungwon An"
],
"categories": [
"physics.optics"
],
"title": "The dependence of transverse and longitudinal resolutions on incident Gaussian beam widths in the illumination part of optical scanning microscopy",
"url": "https://arxiv.org/abs/physics/0411222"
},
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