TY - GEN AU - TREUTING,R G TI - An achromatic doublet of silicon and germanium SN - 0030-3941 PY - 2004///0215 KW - Germanium KW - Lenses KW - Silicon KW - Silicon Compounds N1 - Publication Type: Journal Article UR - https://doi.org/10.1364/josa.41.000454 ER -