Ohara Corporation

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Ohara Corporation is the U.S. subsidiary of the Japanese optical manufacturer Ohara Group.

The parent company is headquartered in Japan. There are subsidiaries in a number of countries, including Japan, the United States, Germany, Hong Kong, Maylasia, Taiwan, and China.

Ohara manufactures glasses since 1935.

Their web site lists areas of specialization, including:

  • Optical Glass
  • Polished Substates
  • Fused Silica and Quartz
  • IR Materials and Optical Crystals
  • Low Expansion Glass
  • Glass Ceramics
  • Measurement Services

Optical glass[edit]

Among other things, Ohara is a major supplier of optical glass. Lens design programs will typically include glasses in the Ohara catalog among their stock material choices, along with, for example, glasses in the Schott catalog.[1]

On their website, Ohara describes a line of more than 130 environmentally safe glasses, produced without lead and arsenic.

They produce more than 300 tons of optical glass a month (against 10800 tons/month for Schott and over 108000 tons/month for Corning). The glass is available in a variety of forms, including strip, slab, cut blanks, and pressings.

Ohara includes in its catalog the famous E6 borosilicate (similar to Corning's Pyrex), ClearCeram-Z (a vitroceramic similar to Schott's Zerodur), and two well-known low dipersion glasses : FPL51 (the UD glass used by Canon) and FPL53 showing properties close to fluorite.

Telescope mirror glass[edit]

Ohara supplied over 23.5 tons of their E6 borosilicate glass to be cast into the blank of the primary and tertiary mirror of the LSST[2]

E6 glass was also used to manufacture the mirror of the Giant Magellan Telescope (GMT) and the Large Binocular Telescope (LBT), both having a primary mirror 8.4 m wide.


  1. ^ For instance the OSLO program includes Schott, Ohara, Hoya, Corning, and Sumita glass catalogs, see Sinclair Optics web site under Software|Technical Data|Catalogs/Libraries
  2. ^ Stiles, Lori (March 17, 2008). "UA Mirror Lab to Cast Two Mirrors in One for the LSST". University of Arizona. Retrieved July 25, 2009. 

External links[edit]