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docs:gaussian_beam [2017/12/01 17:45] Jon Daniels |
docs:gaussian_beam [2019/02/09 00:00] Jon Daniels |
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| * NA_illum is the numerical aperture of the illumination | * NA_illum is the numerical aperture of the illumination | ||
| - | For Gaussian beams the beam/sheet extent or imaging field of view = k2 * lambda / NA_illum^2 where | + | For Gaussian beams the beam/sheet extent or imaging field of view = k2 * lambda |
| * k2 is a constant that depends on how you define the acceptable intensity variation across the field of view. Commonly k2 is taken to be 0.64, which corresponds to the two-sided field of view where the beam thickness as measured by the 1/e^2 criteria has increased by a factor of sqrt(2). | * k2 is a constant that depends on how you define the acceptable intensity variation across the field of view. Commonly k2 is taken to be 0.64, which corresponds to the two-sided field of view where the beam thickness as measured by the 1/e^2 criteria has increased by a factor of sqrt(2). | ||
| * lambda is the wavelength, in this case the excitation laser | * lambda is the wavelength, in this case the excitation laser | ||
| + | * n is the refractive index of the media (1.33 for water) | ||
| * NA_illum is the numerical aperture of the illumination | * NA_illum is the numerical aperture of the illumination | ||
