The City University of New York

Alexey Bykov

Robert R Alfano

Vladimir Petricevic

Mikhail Sharonov

A laser medium includes a single crystal of chromium-doped LiScInGeSiO, where 0&#x2266;x&#x2266;1 and 0&#x2266;y&#x2266;1. Preferably, x and y are not both 0. A laser, such as a tunable near infrared laser, can contain the laser medium.

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A method is described to improve and produce purer Cr-doped laser materials and lasers with reduced co-incorporation of chromium in any other valence states, such as Cr, Cr, Cr, and Cr. The method includes: 1) certain crystals of olivine structure with large cation (Ca) in octahedral sites such as Cr:CaGeO, Cr:CaSiO, Cr:CaGeSiO(where 0&#x3c;x&#x3c;1), and/or 2) high-temperature solution growth techniques that enable the growth of the crystals below the temperature of polymorphic transitions by using low melting point solvent based on oxide, fluoride and/or chloride compounds. Purer Cr-doped laser materials are characterized by a relatively high concentration of Cr-lasing ion in crystalline host that makes these materials suitable for compact high power (thin disk/wedge) NIR laser applications.

Tetravalent chromium doped laser materials and NIR tunable lasers

A laser medium includes a single crystal of Cr:MgMSiAO, where, where M is a bivalent ion having an ionic radius larger than Mg, and A is a tetravalent ion having an ionic radius larger than Si. In addition, either a) 0&#x2266;x&#x3c;2 and 0&#x3c;y&#x3c;1 or b) 0&#x3c;x&#x3c;2 and y is 0 or 1 with the proviso that if M is Caand x=1 then y is not 0. The laser medium can be used in a laser device, such as a tunable near infrared (NIR) laser.

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Bronx, NY, United States of America

Alexey Bykov