Novel narrowband crystal UV filters

• Main Author: SINGH NARSINGH BAHADUR
• Format: Patent
• Language: English
• Published: 24.04.2008
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS; CHEMISTRY; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; ELECTRICITY; GLASS; INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OFSOLID INORGANIC COMPOUNDS; INORGANIC CHEMISTRY; JOINING GLASS TO GLASS OR OTHER MATERIALS; METALLURGY; MINERAL OR SLAG WOOL; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS; SURFACE TREATMENT OF GLASS

Crystals having a narrowband transmission window in the UV range and methods for producing such crystals are disclosed. The method comprises the steps of preparing a saturated nutrient solution of a nickel compound and a dopant salt; and incubating the nutrient solution under conditions suitable for crystal growth. The nickel compound is nickel silicon fluoride, nickel fluoroborate, or potassium nickel sulfate. The dopant salt is a salt of cobalt, calcium, barium, strontium, lead, copper, germanium, praseodymium, neodymium, zinc, lithium, potassium, sodium, rubidium, or cesium. The doped nickel compounds crystals have a narrow transmission window in the UV range and can be used as filters for optical sensors in applications such as the passive missile approach warning systems.