Refractive index database

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Optical constants of OHARA - BAH (Barium, high-index)

Wavelength: µm

Complex refractive index (n+ik)[ i ]

n   k   LogX   LogY   eV

Derived optical constants

Dispersion formula [ i ]


Conditions & Spec sheet

n_is_absolute: false
wavelength_is_vacuum: false
temperature: 25.0 °C
  - type: "Schott formula"
    coefficients: 3.39e-06 1.19e-08 -3.43e-11 5.18e-07 5.64e-10 0.261
nd: 1.670029
Vd: 47.230916
glass_code: 670473
density: 3.48 g/cm3
  - temperature_range: -30 70 °C
    coefficient: 6.8e-06 K-1
  - temperature_range: 20 300 °C
    coefficient: 8e-06 K-1
dPgF: -0.0024
climatic_resistance: 2.0
acid_resistance: 51.2
phosphate_resistance: 1.0




OHARA Zemax catalog 2017-11-30 (obtained from
See also OHARA glass data sheets


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BAF10 optical glass

BAF10 glass is a specific type of optical glass known for its unique refractive index and Abbe number properties. It's often used in the construction of high-precision optical components such as lenses, prisms, and other elements in optical systems that require superior performance. BAF10 glass is especially valued in applications where minimizing chromatic aberration is crucial. The unique composition of this glass type allows it to transmit light with minimal dispersion, thereby improving the quality and clarity of the resulting optical images. BAF10 glass is usually more expensive than more common types of optical glass like BK7 or soda-lime glass, and its use is generally reserved for specialized optical applications where the highest performance is necessary. Overall, BAF10 glass represents a specialized category within optical materials, offering specific advantages in high-performance systems.

BAF10 and similar glasses produced by different makers

Maker Glass
Schott N-BAF10
Hikari E-BAF10
Ohara S-BAH10

Ohara Group

Ohara Group is an international group of companies with headquarters in Japan and subsidiaries in Japan (Ohara, Inc.), United States (Ohara Corporation), and Germany (Ohara, GmbH). Ohara is known for its specialization in high-quality optical glass, ceramics, and other advanced materials. With a history spanning over a century, Ohara has been at the forefront of optical innovations, producing a wide range of specialized glass types including low-dispersion and high-refractive-index materials. These are used in various demanding applications like telescopes, microscopes, and high-performance camera lenses. The company's commitment to research and development has led to groundbreaking products such as low thermal expansion glass-ceramics and other specialty materials used in semiconductor manufacturing and space telescopes. With stringent quality control procedures, Ohara ensures that its optical glass meets the highest standards of clarity, consistency, and performance. Their materials are widely regarded for their exceptional quality and are often used in scientific research, aerospace, and other fields where precision and reliability are paramount. Ohara's reputation for technical excellence and innovation makes it a key player in the global optics and materials science industries, providing cutting-edge solutions for a range of complex applications.

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Glass is a versatile, amorphous material that has been an essential component in optical technologies for centuries. Comprising mainly of silica along with various additives like soda, lime, or boron, glass can be engineered to exhibit a wide range of optical properties, such as refractive indices and dispersion characteristics. In the optical industry, specialized types of glass like crown, flint, and extra-low dispersion (ED) glasses are used for manufacturing lenses, prisms, and other optical elements. These glasses are precisely formulated to offer specific properties, such as low chromatic aberration or high light transmittance across different spectral ranges. Glass can also be coated with thin layers of materials like anti-reflective coatings to enhance its optical performance. More recently, advances in photonics and nanotechnology have led to the development of innovative glass types, such as photonic crystal and metamaterial glasses, which exhibit unique light-manipulating properties. It is crucial to note that the optical properties of glass, including its refractive index, can vary depending on its composition and temperature, making it important to consult specific data for particular applications. Overall, glass remains a foundational material in optics, its wide applicability owed to its tunable properties and general robustness.

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