Preparing method for saturable absorber of cobalt-doped magnesia-alumina-silica based glass ceramics

Abstract

The invention relates to a preparing method for a saturable absorber of cobalt-doped magnesia-alumina-silica based glass ceramics, which realizes ultrashort laser pulse passive Q switching in the wave band of 1.53 mu m. The glass ceramics comprises the components of 47.5 to 54.5 mol% of SiO2, 16 to 22 mol% of Al2O3, 16 to 23 mol% of MgO, 6 mol% of TiO2, 4 mol% of ZrO2 and 0.5 mol% of CoO. The preparing method comprises the steps of: preparing silicate glass in a silicon molybdenum bar furnace with the conventional fusion method at first; then separating out nanometer crystalline phases from the inside of the silicate glass through a heat treatment process; and finally, preparing transparent MaAl2O4 nanometer crystalline transparent glass ceramics. The invention has the advantages of simple process and easy control of crystallization course. Compared with single crystal materials, the saturable absorber of cobalt-doped magnesia-alumina-silica based glass ceramics has the characteristics of short production period, low cost and high laser damage threshold.

Description

technical field [0001] The invention relates to optical functional glass ceramic materials, in particular to a method for preparing a cobalt-doped magnesium aluminum silicon-based glass ceramic saturable absorber capable of passively Q-switching ultrashort laser pulses in the 1.53 μm band. Background technique [0002] With the development of laser technology, in order to improve certain performances of lasers, such as compressing laser pulse width and increasing pulse output power, Q-switching technology has emerged. Common Q-switching technologies include active Q-switching and passive Q-switching. Active Q-switched lasers use electro-optic Q-switching or mechanical rotating mirror Q-switching, etc. This type of modulation technology requires an external pulsed high-voltage power supply or high-frequency drive signal source. The laser system is complex, huge, and expensive. Compared with these active Q-switching technologies, the passive Q-switching technology using intra...

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Problems solved by technology

The research institution has done a lot of work on the preparation of glass ceramics with magnesium aluminum spinel crystal phase, but the crystal phase of the glass ceramics prepared is a single magnesium aluminum spinel crystal phase, and the melting time of the glass is relatively long , it needs to be melted at 1600°C for a long time. In order to obtain a uniform glass, the stirring time takes up to 8 hours, which greatly increases the energy consumption cost and is not conducive to the preparation of cost-effective glass ceramic materials.

Duan Xiulan of Shandong University, etc. (see prior art 2: X.L.Duan, D.R.Ruan, F.P.Yu, et al, transparent cobalt dopedMgO-Ga 2 o 3 -SiO 2 nano glass ceramic composites, Appl.Phys.Lett., 89, 183119 (2006).) has also carried out the research work of preparing this type of glass ceramic material by sol-gel method. However, due to the volatilization of organic components, the glass matrix material contains a large number of pores, which will greatly increase the light scattering loss, which is not conducive to laser output

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