Paragraph 6C Equipment, Assemblies and Components
Materials
Optical Sensors:
Elemental tellurium (Te) of purity levels equal to or more than 99.9995%;
Single crystals of cadmium telluride (CdTe), cadmium zinc telluride (CdZnTe) or mercury cadmium telluride (HgCdTe) of any purity level, including epitaxial wafers thereof;
Optical fibre preforms specially designed for the manufacture of high birefringence fibres specified in sub-head d.3. of entry 6A002.
Optics:
Zinc selenide (ZnSe) and zinc sulphide (ZnS) substrate blanks produced by the chemical vapour deposition process:
Larger than 100 cm3 in volume; or
Larger than 80 mm in diameter with a thickness equal to or more than 20 mm;
Boules of the following electro-optic materials:
Potassium titanyl arsenate (KTA);
Silver gallium selenide (AgGaSe2); or
Thallium arsenic selenide (Tl3AsSe3, also known as TAS);
Non-linear optical materials having:
Third order susceptibility (chi 3) equal to or less than 1 W/m2; and
A response time of less than 1 ms;
Substrate blanks of silicon carbide or beryllium beryllium (Be/Be) deposited materials exceeding 300 mm in diameter or major axis length;
Low optical absorption materials, as follows:
Bulk fluoride compounds containing ingredients with a purity of 99.999% or better;
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Note: Sub-head e.1. of this entry specifies fluorides of zirconium or aluminium and variants.
Bulk fluoride glass made from compounds specified in sub-head e.1. of this entry;
Glass, including fused silica, phosphate glass, fluorophosphate glass, zirconium fluoride (ZrF4) and hafnium fluoride (HfF4) with:
A hydroxyl ion (OH—) concentration of less than 5 ppm;
Integrated metallic purity levels of less than 1 ppm; and
High homogeneity (index of refraction variance) less than 5 × 10−6;
Synthetically produced diamond material with an absorption of less than 10−5 cm−1 for wavelengths exceeding 200 nm but not exceeding 14,000 nm;
Optical fibre preforms made from bulk fluoride compounds containing ingredients with a purity of 99.999% or better, specially designed for the manufacture of fluoride fibres specified in head f. of entry 6A004.
Synthetic crystalline laser host material in unfinished form, as follows:
Titanium doped sapphire;
Alexandrite.