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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

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Aberration limits for annular Gaussian beams for optical storage.

T C Strand, H Werlich

|October 2, 2010

Summary

Annular apodization of Gaussian beams enhances optical storage by reducing sensitivity to defocus and spherical aberrations. This technique improves focusing capabilities while slightly increasing astigmatism sensitivity.

Area of Science:

Optics and Photonics
Optical Engineering
Information Storage

Background:

Annularly apodized beams offer potential for advanced optical storage beyond conventional limits.
Concerns exist regarding the impact of aberrations on these beams with concentrated energy.

Purpose of the Study:

To investigate the effects of aberrations on annularly apodized Gaussian beams.
To evaluate the suitability of these beams for optical storage applications.

Main Methods:

Theoretical calculations of beam behavior under aberration.
Experimental validation of calculated results.

Main Results:

Annular apodization significantly reduces sensitivity to defocus and balanced spherical aberrations.

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Sensitivity to coma aberrations is also reduced.

A slight increase in sensitivity to astigmatism was observed.

Conclusions:

Annularly apodized Gaussian beams demonstrate reduced sensitivity to key aberrations, making them promising for optical storage.
The trade-off involves a minor increase in astigmatism sensitivity, which needs consideration in system design.