Company History

The factory when established The factory when established
1940〜
1947

Established as a synthetic gemstone manufacturing company Head office: Kobiki-cho, Chuo-ku, Tokyo

Verneuil sapphire and ruby factory: Kosugaya, Totsuka-ku, Yokohama (Current head office)

1950〜
1954

Expanded business into production and distribution of synthetic gemstone, oxygen and hydrogen

Inside of the factory around 1965 Inside of the factory around 1965
1960〜
1960

Head office relocated to Ginza, Chuo-ku, Tokyoz

1964

Succeeded in development of star ruby for jewelry and ruby for laser

1970〜
1970

Started production of sapphire watch windows

In 1973 In 1973
1980〜
1980

Rubica-Kogyo Co., Ltd. established as a crystal boule manufacturing affiliate in Uozu, Toyama (Joint company with Japan Carbide Industry)

1987

Entered the optical communication area by starting rutile prism sales
Product information: Rutile prism

1989

Started sales of single crystal substrates for superconductive thin films growth

In 1992 In 1992
1990〜
1990

Started sales of optical isolator for optical fiber communication system

1993

Started sales of the world’s smallest polarization-independent optical isolator

1994

Started sales of STEP substrate
Head office relocated to Kyobashi, Chuo-ku, Tokyo

1995

Started sales of sapphire substrates for blue LEDs
Product information: Sapphire substrate

1996

Won the JACG Industrial Achievement Award for “Development of crystal growth and processing technology for oxide substrate for superconducting thin film”

1997

Acquired ISO9001 certification from DNV.
Won the Kanagawa Industrial and Technological Development Award for “Development of oxide single crystal STEP substrate”
Product information: STEP substrate

In 1999 In 1999
2000〜
2001

・Head office relocated to Kosugaya, Sakae-ku, Yokohama
・Sakudaira plant operation started

2002

Won the Kanagawa Industrial and Technological Development Award for “Development of small optical monitor module”
Tochigi factory operation started

2003

Acquired ISO9001:2000
Sakudaira plant closed and merged with the Head office
Tochigi factory renamed to Tochigi plant

2004

Started sales of optical fiber sensor

2007

Won the Kanagawa Industrial and Technological Development Incentive Award for “Development of optical fiber sensor using the Faraday effect”
Product information: Optical fiber sensor

In 2008 In 2008
2008〜
2008

Won the Kanagawa Industrial and Technological Development Incentive Award for “Development of 1mm-band heat releasing optical fiber isolator”
Product information: Optical isolator for fiber laser
Won The Excellent Member Company of Industrial Division of The Yokohama Chamber of Commerce and Industry Award

2012

Acquired EcoAction 21 certification from the Ministry of the Environment

2014

Won The Glittering Industrial Technology in the Nine Prefectural and City Governments Award for “Application of optical wavelength multiplexing sensing system into the environmental field”

2016

Won the Kanagawa Prefecture Excellent Factory Award

2018

Sapphire mirror adopted in KAGRA, a large-scale cryogenic gravitational-wave telescope