Abstract
Direct focusing of laser diode elliptical Gaussian beams on the focused beam profile and on the cross talk and frequency characteristics is described when the beam which enters the objective lens deviates in a direction perpendicular to the information track. The experimentally measured values of the spot profiles agree well with the calculated values. As the result of deviations, the first-order maxima of the focused beam increase and the cross talk level increases. If the acceptable level is 3 dB in the cross talk level, the beam deviation ratio must be less than 0.18 of the objective lens radius. The beam deviation ratio of 0.18 is acceptable for practical applications. The degradation was less than 0.3 dB for frequency characteristics and 0.2 dB for the objective lens transmittance when the beam deviation ratio was 0.18 of the objective lens radius.
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