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

A chalcogenide glass composition comprising (based on mol % of total moles):

• (a)
• Component
• Mole %
• S
• 58.00-90.00
• Ga
• 0-25.00
• As
• 0-40.0
• Ge
• 0-35.00
• R1
• 0-7.25
• (added in the form of R1Hal)
• R2
• 0-13.5
• (added in the form of R2Hal)
• M1
• 0-5
• (added in the form of M1Hal2)
• M2
• 0-7.25
• (added in the form of M2Hal2)
• Ln
• 0-4
• (added in the form of LnHal3)
• Sum of Ga, As, and Ge
• 10.00-42.00
• Sum of R1, R2, M1, M2, and Ln
• 0-16.00
• Sum of Hal
• 0-16.00
• wherein
• Hal=fluoride, chloride, bromide, and/or iodide,
• 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, and
• Ln=La, Ce, Pr, Nd, Pm, Sm Eu, Gd, Tb, Dy, Ho, Er, Tm, Ty, Lu, Y, and Sc;
• or
• (b)
• Component
• Mole %
• Se
• 30.00-68.00
• Ga
• 5.00-30.00
• Ge
• 0-25.00
• R1
• 0-25.00
• (added in the form of
• R1Hal1)
• R2
• 0-25.00
• (added in the form of
• R2Hal1)
• M1
• 0-12.50
• (added in the form of
• M1Hal12)
• M2
• 0-20.00
• (added in the form of
• M2Hal12)
• Ln
• 0-8
• (added in the form of
• LnHal13)
• Sum of Se, Ga, and Ge
• 50.00-93.33
• Sum of R1, R2, M1, M2 and
• 1.67-25.00
• Ln
• Sum of Hal1
• 5.00-25.00
• 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, and
• Ln=La, Ce, Pr, Nd, Pm, Sm Eu, Gd, Tb, Dy, Ho, Er, Tm, Ty, Lu, Y, and Sc;
• and
• wherein in each of (a) and (b) a portion of the gallium can be replaced by indium, and wherein in (a) a portion of the arsenic can be replaced by antimony.