Ohara Optical (M) Sdn Bhd

OHARA successfully developed synthetic fused silica SK-1300 series as a result of significant improvements made to the conventional VAD (vapor-phase axial deposition) method of optical fiber manufacturing technology.

Unparalleled,ideal characteristics are achieved.

-Ultra-high purity(total metallic impurities less than 0.5ppm)

-The OH content can be controlled to 1ppm to less.

-High heat resistance is ensured.

-High transmission is achieved. (The SK-1310 has excellent characteristics over the entire wavelength range of ultraviolet,visible and infrared.)

-Contain no bubbles or striae. Excellent laser resistance properties.

-The material for excelling in the homogeneity and precise optics is prepared.(SK-1320 series)

SK-1300 is extremely high in purity and much lower in OH content than the traditional direct method, thus making it the first synthetic fused silica usable in the semiconductor and liquid crystal display industries.

SK-1300 is the state-of-the-art technology in optical characteristics because it provides a high ultraviolet transmission, no micro inclusion and a solarization resistance, in addition to heat resistance, mechanical strength, and chemical resistance.

These products can be used in a wide variety of industrial applications for semiconductors, optical and all physical or chemical related research featuring these applications:

• Wafers for various types of devices such as TFT(poly-Si thin-film transistor LCD.), SOI (Silicon on Insulator) etc.
• Photomask substrates for ultra-LSI and LCD.
• Reactor furnace tubes, jigs and tools for ULSI manufacturing processes.
• Electrical-discharge lamp tubes.
• Optical elements, Ienses, mirrors and windows, for ultraviolet and vacuum ultraviolet.

CLEARCERAM™-Z is a glass-ceramic with an Ultra-Low Thermal Expansion Coefficient. This material was developed by OHARA based on our knowledge of High Homogeneity melting and Precise Crystallization. This material is produced under tightly controlled conditions and offers outstanding thermal, mechanical and chemical properties. 

Ultra-Low Expansion

The material shows almost Zero Thermal Expansion over a wide temperature range and offers superior thermal shock resistance. CLEARCERAM™-Z Regular offers lower thermal expansion across a wide temperature range, while the CLEARCERAM™-HS offers lower thermal expansion near room temperature. CLEARCERAM™-Z EX features extremely low temperature dependence of thermal expansion in 0 to 50degree C, which is less than half of the present high spec grade (CLEARCERAM™-Z HS) 

Superior Mechanical Properties

The material has very high chemical durability and is very stable in various cleaning and thin-film coating processes. CLEARCERAM™-Z does not contain Na, K, B, F, or Pb in its composition which is a main reason for the excellent chemical resistance the material displays.

Superior Machinability

The crystal grain structure of the material prevents the propagation of micro crack caused in machining process. This property allows the material to be processed into various shapes with high accuracy, with ease of machinabilty and elevated yield rates.

Excellent Chemical Properties

The material has very high chemical durability and is very stable in various cleaning and thin-film coating processes. CLEARCERAM™-Z does not contain Na, K, B, F, and Pb in its composition which is a main reason for excellent chemical resistance the material displays.

These materials are optically homogeneous and have excellent internal transmittance and high durability against solarization (coloring by UV). They are used in semi-conductor production equipment (Stepper Cameras) and its peripherals (Illumination Systems, etc.).

Internal Transmittance (τ)

Internal transmittance of the glass is indicated as guaranteed minimum transmittance at 365nm (10 and 25 mm sample thickness). Please note this is internal transmittance, reflection losses are not included.

Solarization

The degree of solarization is indicated as a decrease in transmittance caused by radiation from a super high pressure mercury-vapor lamp. The detailed measurement method is described in the "Japanese Optical Glass Industrial Standard (JOGIS)".

Optical Homogeneity

Optical Homogeneity (Δn) is guaranteed by use of our He-Ne laser interferometers. The Δn specification is indicated for three diameter ranges (Φ 160 mm or less, Φ 210 mm or less, Φ 260 mm or less) due to the Δn variances caused by glass type, size, and shape. Please note, if the ordered thickness is less than 25 mm, we will use a 25 mm thick test piece for Δn measurement. Please contact us when lower Δn specifications are required.

Refractive Index (ni) Variation within one Lot (Sn Standard)

The indicated Sn value is the refractive index variation after annealing within a single batch (same melt, same annealing run). Example: ±1 (×10⁻⁵)

Refractive Index Tolerance

The standard refractive index (ni) of our i-line glasses is higher than our catalogue nominal values. This is due to the longer annealing times which are necessary to obtain the desired homogeneity levels. Longer annealing times result in higher refractive indices. Example: +20±20

NANOCERAM^TM is glass-ceramic for which we have further evolved OHARA’s nanocrystallization technology, thus far recognized in all fields, and achieved superior mechanical properties and high transmittance.

This product is used in covers for automotive sensors and cover glass for smartphones where high strength is required.

Impact Resistance High Hardness

Compared with general borosilicate glass, NANOCERAM™ has 30% higher hardness and showed more than 10 times higher impact resistance in steel ball drop impact test. In addition, it has a 20% higher hardness than chemically strengthened glass, and showed more than 3 times higher impact resistance in steel ball drop impact test. Also, it has better fracture toughness than sapphire crystal glass, and cracks that cause breakage do not occur even if there are scratches and realizing a characteristic that is resistant to cracking.

Good Processability

Although it has the properties of hard ceramics, the cutting, polishing and moldability realized workability comparable to that of glass. Moreover, it has grinding and polishing property which can shorten process time to about 1 / 20th of sapphire crystal glass.

High Transmittance

Since, crystal grains of glass ceramics are large, so it is difficult to transmit light and never used for optical applications. However, high transparency has been realized by Ohara's nanocrystallization technology (particle diameter about 6 nm) which has a high track record in the space and astronomy fields. NANOCERAM™ is mounted on a high-end lens protector for single-lens reflex interchangeable lenses of domestic manufacturers who are demanding strict optical performance and precise quality, and NANOCERAM™ has received high marks.

Optical glass is used in various optical devices such as digital single lens reflex cameras, projectors, television cameras, automotive cameras, security cameras and medical devices. At OHARA, we meet all optical design needs with a line-up of over 150 types of optical glasses with the characteristics that enable optical devices to attain higher performances, miniaturization and cost reduction.
The cutting-edge glass materials of the highest quality that OHARA provides support people around the world in their smiles and sense of wonder.

137 different types of optical glass for use in polished lenses and optical elements. For the purpose of global environmental conservation, OHARA uses no lead or arsenic in these 137 glasses. To distinguish these glasses from others containing lead or arsenic, the names for these 136 environmentally safe glass types begin with S-.

OHARA produces 18 types of optical glass for use in molded lenses. The glass type designation for these types begins with L-. They are also environmentally friendly, as they do not contain lead or arsenic.Pressings(Reheat Pressings)

Pressings(Reheat Pressings): Reheat or hand pressings (RP) are blanks formed by manually pressing softened glass. We urge the customer to specify the following:

Dimensional Specified Blanks: Cut discs, cut rectangles, and cut prisms are blanks that are cut or core drilled from annealed strips or slabs.
These forms are generally specified when delivery is urgent and quantities are small.

Saw cut Centerless Ground Cylindrical Blanks: These blanks are cut from a precisely ground rod formed on a center less grinding machine.

Polished Balls: These lenses are polished into a spherical shape. Polished balls can be used as a preform for glass mold lens.

Polished Lenses: The lenses have been subjected to double side polishing, centering and coating.

Polished Preforms: Polished preforms are made from reheated pressings or saw cut ground cylindrical blanks and are used for glass moldings. For the dimensions, specifications and other details on the polished preforms, please contact our sales department. 

Aspherical Glass Mold Lenses: Using the polished glass blanks which was heated up to high temperature and softened, the shapes of high precision aspherical shape mold tool are press-formed. For the dimensions, specifications and other details on the lenses, please contact our sales department.