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High homogeneous glass for space optics |
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Space optics requires optical material with high degree of homogeneity and transmission coefficient. The degree of homogeneity of blanks for space optics items is estimated by the difference of refraction indexes delta n within a blank volume that equals to (1-2)х10-6. The transmission coefficient tA is oscillated within 0.999 – 0.985 inside glass layer having thickness 25mm for various glass types.  OK-4 high homogeneous glass The most applicable glass types for space optical devices: | glass type | nd - vd code | nd | vd | ne | ve | alpha 107 oC-1 up 20oC to 120oC | p (g/cm3) | glass location according Abbe diagram | | Schott | Corning France | Hoya | Ohara | | K8 | 516641 | 1.51637 | 64.07 | 1.51829 | 63.87 | 76 | 2.52 | ВК7 | BSCB16-64 | BSC7 | BSL7 | | BK6 | 540597 | 1.53998 | 59.67 | 1.54214 | 59.40 | 82 | 2.86 | ВаК2 | BCLB39-59 | BaC2 | AL12 | | BK8 | 547628 | 1.54678 | 62.78 | 1.54886 | 62.56 | 62 | 2.85 | PSK | PCD | PCD | BAL | | TK14 | 613606 | 1.61309 | 60.58 | 1.61551 | 60.33 | 69 | 3.51 | SK | BCD | BaCD | BSM | | TK16 | 613584 | 1.61269 | 58.35 | 1.61519 | 58.08 | 73 | 3.56 | SK4 | BCDC13-58 | BaCD4 | BSM4 | | TK21 | 657511 | 1.65691 | 51.12 | 1.65996 | 50.82 | 80 | 3.98 | SSKN5 | BCDDC5851 | BaCED5 | BSM25 | | CTK3 | 660574 | 1.65950 | 57.35 | 1.66224 | 57.09 | 80 | 3.91 | LaK | BCS | LaC | LAL | | BF25 | 608461 | 1.60772 | 46.11 | 1.61085 | 45.82 | 73 | 3.47 | BaF52 | FB | BaF7 | BAM | | F1 | 613370 | 1.61294 | 36.95 | 1.61688 | 36.69 | 74 | 3.57 | F3 | FD | F3 | PBM3 | | TF1 | 648339 | 1.64766 | 33.87 | 1.65219 | 33.62 | 85 | 3.86 | SF2 SF12 | FDDC48-34 | FD2 FD12 | PBM22 PBM32 | | TF3 | 717295 | 1.71741 | 29.51 | 1.72317 | 29.29 | 83 | 4.46 | SF1 | FeDD17-29 | FD1 | PBH1 | | TF4 | 740282 | 1.74002 | 28.16 | 1.74623 | 27.94 | 82 | 4.65 | SF3 | FeDD40-28 | FD3 | PBH3 | | TF8 | 690311 | 1.68949 | 31.13 | 1.69473 | 30.90 | 81 | 4.23 | SF8 | FeDC89-31 | FD8 | PBM28 | | OF4 | - | - | - | - | - | - | - | - | - | - | - | | OF6 | - | - | - | - | - | - | - | - | - | - | - | Blanks dimensions of supply: diameter up to 700mm, thickness up to 120mm. More detailed information about these glass types is presented in clear optical glass catalogue as well in the printed optical glass catalogue of LZOS, JSC that you could order additionally.
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