| SHOPS (PROTOTYPE PRODUCTION) |
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OPTICAL SHOP |
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General view
Vacuum deposition section
Optical elements
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This is staffed by 18 skilled technicians with a variety of specialist skills.
The optical shop can carry out the complete set of technical processes required to convert a basic piece of glass into a completed element with appropriate optical coatings.
Sections:
- Basic operations:
- sawing,
- curve generation,
- grinding
- Fine grinding and polishing
- Centering
- Gluing
- Cleaning
- Chemical AR coatings
- Vacuum coatings
- Manufacturing of IR optics
The optical details of any glass quality ranging from 3 mm to 850 mm (the size is restricted by the vacuum systems)
with surface accuracy of up to l/10...l/20 and angular accuracy equal to ~3...5" can be manufactured in the shop. A large variety of large-aperture optical elements for space objectives, and blanks for diffraction gratings have been manufactured in the shop. Optical finishing of monocrystine components, including toxic ones, up to 350 mm are carried out at the environmentally sealed section.
More than twenty techniques of vacuum deposition are employed in the shop, among which are the application of antireflecting coatings on laser rods, narrow-band interference filters in the visible and IR spectral region, thick aluminium coatings for the large nickel-based plates with a nonuniform density, deposition of the conducting coatings and so on. Method of deep optical contact is used to manufacture the optical systems.
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| Small-sized, high-precision lenses |
| clear aperture | 3...50 mm |
| surface quality | III-IV (MIL-20/10) |
| centering | up to 5 μm |
| surface accuracy | up to l/20 at 632.8 nm |
| Mean accuracy lenses |
| clear aperture | 50...300 mm |
| surface quality | V-VI |
| surface accuracy | up to l/4 at 632.8 nm |
| Leucosapphire lenses and windows |
| diameter | up to 70 mm |
| surface quality | 60/40 |
| surface accuracy | up to l/4 at 632.8 nm |
| Optical wedges |
| clear aperture | up to 630 mm |
| thickness | 0.1 of diameter |
| surface error | (0.08±0.015)λ PV |
| Precision prisms |
| deviation of angular parameter | ±1...5" |
| Corner reflector with an error in clear aperture | 4" |
| Mean accuracy plates |
| wedging | 30" |
| clear aperture | up to 500 mm |
| wavefront distortion | l/10 |
| Large-sized optics: mirrors, lenses, windows |
| clear aperture | up to 860 mm |
| surface quality | V-VIII (MIL-80/50) |
| surface accuracy | up to l/8 at 632.8 nm |
| Plates and lenses made of crystals | NaCl, KCl, KBr,ZnSe, Ge, CaF2, liF, BaF2, Al2O3 and others |
| Active elements made of Nd-glass: |
| plane | up to 500õ260õ40 mm |
| cylindrical | up to Ø140õ330 mm |
| Quartz plates λ/2 (λ=0.6328 μm) |
| wavefront distortion | l/10 |
| Details made of glass and vitreous ceramics connected by a deep optical contact | up to 250õ250õ50 mm |
| Waveguides of different configuration made of metal and ceramics for ÑÎ2 lasers | up to 450 mm in lenght |
| Souvenirs | optical glass |
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