FLUOROPHOSPHATE OPTICAL GLASS HAVING HIGH POSITIVE ABNORMAL PART OF DISPERSION VALUE DELTA VE OF *10*0 TO *21*0 * COMPARATIVELY HIGH REFRACTION INDEX OF 1*47 TO 1*54 AND ABBE NUMBER OF 84*1 TO 51*0

摘要

A fluorophosphate glass of a high positive anomalous partial dispersion DELTA nu e within the range of from about +10.0 to about +21.0, a relatively high index of refraction ne within the range of from about 1.47 to about 1.54, and an Abbe number nu e within the range of from about 84.1 to about 51.0 is provided. A simple process of melting such a glass is disclosed.