Focusing property and focal depth of amplitude-modulated Gaussian beam

YANG Rong; LI Jin-song

doi:10.3969/j.issn.1001-3806.2009.04.030

In order to study the focusing property and focal depth of amplitude-modulated Gaussian beam in different numerical-aperture(NA):they were numerically simulated according to the vector diffraction theory based on Debye approximate condition.Simulation results showed that the intensity in the focus plane was in a circular shape in a low NA optical system;while in a high NA optical system,it was in an elliptical shape because of the polarization effect.The focal spot size and focal depth can be adjusted by changing the geometric parameters and the amplitude modulation parameter exponential n of Gaussian beam.

Focusing property and focal depth of amplitude-modulated Gaussian beam

Corresponding author: LI Jin-song, lijinsong@yahoo.com.cn

1. Institute of Optoelectronics Technology, China Jingliang University, Hangzhou 310018, China

Received Date: 2008-07-08

Accepted Date: 2008-09-10

Available Online: 2009-08-25

Abstract: In order to study the focusing property and focal depth of amplitude-modulated Gaussian beam in different numerical-aperture(NA):they were numerically simulated according to the vector diffraction theory based on Debye approximate condition.Simulation results showed that the intensity in the focus plane was in a circular shape in a low NA optical system;while in a high NA optical system,it was in an elliptical shape because of the polarization effect.The focal spot size and focal depth can be adjusted by changing the geometric parameters and the amplitude modulation parameter exponential n of Gaussian beam.

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Reference (11)

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Focusing property and focal depth of amplitude-modulated Gaussian beam

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References

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