Abstract

Optical performance results are reported for a molded-glass biaspheric lens. The 6-mm optical diam lens is intended for use in a laser-based optical disk application. The design with fabrication tolerances has an expected on-axis transmitted wave-front performance of 0.06-wave rms optical path difference (OPD) when tested at 0.6328 μm and a numerical aperture of 0.45. Transmitted wave-front aberrations were measured on actual molded lenses using a heterodyne interferometer. Typical performance was 0.05–0.08-wave rms-OPD. Experimental results involving mold rotation indicate that lens performance is primarily limited by a surface figure accuracy of one of the molds.

© 1983 Optical Society of America

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References

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  1. R. O. Maschmeyer, C. A. Andrysick, T. W. Geyer, H. E. Meissner, C. J. Parker, L. M. Sanford, Appl. Opt. 22, 2410 (1983).
    [CrossRef] [PubMed]

1983 (1)

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Figures (6)

Fig. 1
Fig. 1

Molded glass biaspheric lens.

Fig. 2
Fig. 2

Schematic drawing of the biaspheric lens. The total lens diameter exceeds optical diameter. The f/Nos. indicate surface optical speeds as if the surface were spherical.

Fig. 3
Fig. 3

Schematic of the interferometer configuration used to measure molded aspheric lenses.

Fig. 4
Fig. 4

OPD map of a molded biaspheric lens measured double pass at 0.45 N.A. and 0.6328 μm. G, rms, and P–P should be divided by two for single-pass performance.

Fig. 5
Fig. 5

OPD map of the same molded lens as in Fig. 4, except the lens has been rotated 90° clockwise. Morphology of the map can be seen to have rotated 90°. G, rms, and P–P should be divided by two for single-pass performance.

Fig. 6
Fig. 6

Plot of map vs mold orientations. R2 for the linear regression is 0.97.

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