Study On Ge-In-S System Chalcogenide Glass And Its Glass Ceramic Third-order Optical Nonlinearity

In recent decades,with the continuous development of optical technology and the advent of the information age,all-optical communication will be the mainstream of future communications,but to achieve this desire,passive devices such as optical filters,all-optical switches,and wavelength converters The practical application should be valued by the majority of scientific researchers.The key to producing ultra-fast photonic devices is the third-order nonlinear performance of the materials required for the device.Among many optical materials,the third-order nonlinear performance of sulfur-based glass is very good.Compared with ordinary quartz glass materials,the third-order nonlinear refractive index of sulfur-based glass materials can reach more than 1,000 times.And chalcogenide glass also has good infrared transmission performance,especially in the mid-far infrared(ie 3～5mm,8～20mm).What’s more important is that sulfur-based glass materials are compatible with optical fiber communication technology,so they have been considered very promising for manufacturing infrared and nonlinear photonic devices.In this paper,Ge-In-S system chalcogenide glass and Ge-In-S-CsClsystem chalcogenide glassceramics were prepared by melt-quenching,respectively.In element was introduced in the form of indium sulfide(In2S3).Among them,the atomic mass of In is much higher than that of traditional chalcogenide glass glass-forming elements such as Ge and Ga,which will help to improve the thirdorder nonlinearity of glass.In2S3 is a defective crystalline semiconductor material with a wide spectral response range,which can enhance the nonlinear response of chalcogenide glass in a wide spectral range.β-In2S3 nanocrystalline particles were introduced into Ge-In-S-CsCl chalcogenide glass by heat treatment.The two experimental samples obtained were tested differently,and the optical properties,internal structure,and third-order optical nonlinearity of the samples were analyzed one by one to find the most suitable nonlinear materials for infrared optics.This kind of research has important reference value for the research and preparation of non-linear material devices in the field of chalcogenide glass in the future,so that devices in different environments will have suitable materials for selection.The specific arrangement is as follows:The first part is the analysis of infrared optical properties.The spectrograms obtained from the tests of the two experimental samples at the preparation site can determine that the Ge-In-S system chalcogenide glass will increase its transmittance when the Ge element increases,and the absorption is With the breaking of the stoichiometry ratio,the red shift is great when the Ge element increases.The calculated optical band gap also decreases with the red shift of infrared absorption.However,the transmittance of Ge-In-S-CsCl chalcogenide glass-ceramics decreases with the increase of heat treatment time,even at 800 nm,and the infrared absorption redshifts with the increase of heat treatment time.The change in optical band gap is still reduced when redshifted.The second part is the analysis of the internal structure of the sample:the dominant position of the dominant peak of the Ge-In-S system chalcogenide glass can be obtained through the test of Raman spectroscopy.It will only decrease when the Ge element increases,and the other peaks at the same time there will be some enhancements.The peaks of Ge-In-S-CsCl chalcogenide glassceramics remain almost unchanged during rapid heat treatment.However,XRD,SEM,and TEM tests can find that the nanocrystalline particles inside the glass-ceramics increase with the heat treatment time While growing.The third part is the analysis of the third-order optical nonlinearity of the sample:Through the Z-scan test,it can be obtained that the Ge-In-S system chalcogenide glass will increase when n2 andβ are broken when the stoichiometric ratio is broken.It will grow more as it increases.In the Ge-InS-CsCl system chalcogenide glass-ceramics,n2 and β increase with the increase of heat treatment time.The reasons for the third-order optical nonlinearity change in two experiments are analyzed.