Laser recording with a Gaussian beam and focusing lens of finite aperture is analyzed. It is shown that, for a Laser recording given recorded spot size, optimal values exist for the lens f/number and filling factor, the ratio of Gaussian to lens diameter, which minimize power. Sensitivity curves are presented for power vs f/beam diameter number and vs filling factor. The on-axis focal plane intensity is maximized by deviating from the optimal factor at the expense of a slight power increase. Effects of power variations on recorded spot size are filling considered.
© 1979 Optical Society of America
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