Composite four-element lens system, particularly for use with la

Details Composite four-element lens system, particularly for use with la Composite four-element lens system, particularly for use with la

1976-02-20

1978-03-28

Sacher, Paul A.

G02B 934

Patent

active

040812103

ABSTRACT:
To reduce the size of the beam spot of a laser beam, a four-element lens having the characteristics set forth in the table forming part of the specification, is used, thereby providing a large-aperture objective with a field being about 2.degree., coma corrected and with low image field convexity.

REFERENCES:
patent: 2310502 (1943-02-01), Warmisham
patent: 3454327 (1969-07-01), Turula et al.

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