Glasses for the correction of chromatic and thermal optical aberations for lenses transmitting in the near, mid, and far-infrared sprectrums

摘要

The invention relates to chalcogenide glass compositions for use in a lens system to balance thermal effects and chromatic effects and thereby provide an achromatic and athermal optical element that efficiently maintains achromatic performance across a broad temperature range. The glass composition is based on sulfur compounded with germanium, arsenic and/or gallium, and may further comprise halides of, for example, silver, zinc, or alkali metals. Alternatively, is based on selenium compounded with gallium, and preferably germanium, and contains chlorides and/or bromides of, for example, zinc, lead or alkali metals.

主权项

1. A chalcogenide glass composition comprising (based on mol % of total moles):ComponentMole %Se30.00-68.00   Ga5.00-30.00  Ge0-25.00R10-25.00(added in the form ofR1Hal1)R20-25.00(added in the form ofR2Hal1)M10-12.50(added in the form ofM1Hal12)M20-20.00(added in the form ofM2Hal12)Ln0-8   (added in the form ofLnHal13)Sum of Se, Ga, and Ge50.00-93.33   Sum of R1, R2, M1, M2 and1.67-25.00  LnSum of Hal16.00-25.00   wherein
Hal1=chloride and/or bromide,R1=Li, Na, K, Rb, and/or Cs,R2=Ag and/or Cu,M1=Mg, Ca, Sr, and/or Ba,M2=Zn, Cd, Hg, and/or Pb, andLn=La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Ty, Lu, Y, and Sc; andwherein a portion of the gallium can be replaced by indium.