Nonlinear optical crystal material Sr3Y3BiB4O15 and preparation method and application thereof

Abstract

The invention discloses a nonlinear optical crystal material Sr3Y3BiB4O15 and a preparation method and application thereof. The crystal material is bismuth yttrium strontium borate shown as the chemical formula of Sr3Y3BiB4O15, belongs to a hexagonal system, and has the space group of P63 and the unit cell parameters of a=10.6975(13)A and c=6.7222(12)A. A crystal structure comprises BO3 radicals which are arranged in accordant direction and a BiO3 radical with lone pair electrons which are arranged in accordant direction, so that nonlinear effect is 3 to 5 times that of KH2PO4. A crystal has moderate hardness, is free from being deliquesced or cleaved, and is easy to cut, polish and store. The crystal grows by a flux growth method. The preparation method comprises the following steps of: mixing bismuth yttrium strontium borate and a fluxing agent; heating the mixture to obtain solution; stirring; preserving heat; cooling until the temperature is 0.5 to 3 DEG C above a saturation point; adding crystal seeds; controlling an appropriate temperature lowering speed; when the crystal grows to a certain degree, extracting the crystal out of a liquid surface; and slowly lowering the temperature to room temperature so as to obtain Sr3Y3BiB4O15 monocrystal. The crystal can serve as a frequency doubling crystal in an optical parametric oscillator and a harmonic generator. Moreover, the crystal comprises a yttrium element, so that other rare earth ions can be doped so as to obtain a self-frequency-doubling laser crystal.

Description

technical field

[0001] The invention relates to the field of optoelectronic functional materials, in particular to a nonlinear optical crystal Sr 3 Y 3 BiB 4 o 15 Flux crystal growth method and use thereof, and rare earth doped Sr 3 Y 3 BiB 4 o 15 Crystal and flux crystal growth method and use thereof. Background technique

[0002] In recent years, with the rapid development of laser technology, it has been widely used in many fields such as optics, communication, medicine, and military affairs. In particular, all-solid-state lasers have attracted people's attention because of their small size, low price, and simple structure. All solid-state lasers are generally produced by laser diode pumped laser crystals, such as direct pumping Nd:YAG can produce 1064nm laser. Pumping laser crystals generally can only produce infrared lasers, but not short-wavelength lasers. To produce shorter-wavelength lasers, nonlinear optical crystals must be used for frequency doubling, freq...

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