PENENTUAN INDEKS BIAS KACA TBZP TERDEDAH ION Nd3+ DENGAN METODE SUDUT BREWSTER

A Pramuda, A. Marzuki, Cari -, Wahyudi -, R. Susanto

Abstract


Abstrak

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Kaca tellurite merupakan material yang sangat menjanjikan untuk aplikasi laser dan optika non linear. Pengukuran indeks bias merupakan salah satu bagian dari penentuan sifat fisik optik yang penting untuk mengestimasi sifat-sifat laser kaca. Penelitian ini bertujuan menentukan dan menganalisis indeks bias kaca berbasis tellurite TBZP Terdedah ion Nd3+ yang telah berhasil difabrikasi dengan teknik melt quenching dengan komposisi 55TeO2-2Bi2O3-(38-x) ZnO-5PbO-xNd2O3(% mol)(x=0,5; 1; 1,5; 2; 2,5). Indeks bias kaca diukur dengan metode sudut brewster pada mode tranverse magnetic (TM). Pada mode TM dapat ditentukan besar sudut brewster dan nilai reflektansi minimum kaca. Hasil penelitian menunjukkan kaca TBZP terdedah ion Nd3+ yang telah berhasil dipabrikasi memiliki indeks bias kaca yang tergolong tinggi meningkat dari 1,825 ke 2,081 seiring meningkatnya konsentrasi modifier Nd2O3 dari 0,5 % mol ke 2,5 % mol. Penambahan kation pada jaringan struktur kaca memberikan pengaruh pada struktur kaca dan mengarah ke perubahan lokal dari distribusi ikatan Bridging Oxygen (BO) dan Non Bridging Oxygen (NBO). Penambahan konsentrasi Nd3+ menyebabkan terjadinya peningkatan pada nilai parameter sifat fisik lain seperti massa molar, massa jenis, volume molar, dan molar refraction.

Abstract

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Tellurite glass is a promising material for laser applications and non-linear optics. The measurement of the refractive index is a part of the physical properties determination that is important for estimating the optical properties of glass laser. This research determined and analyzed the refractive index of tellurite-based glass TBZP dopedNd3+fabricated by melt quenching technique with composition 55TeO2-2Bi2O3-(38-x) ZnO-5PbO-xNd2O3(mol%)(x=0,5; 1; 1,5; 2; 2,5). The refractive index of glass was measured by the brewster angle method on tranverse magnetic mode (TM). On the TM mode it could be determined the brewster angle and minimum reflectance value of the glass. The results showed high refractive index of fabricated glassTBZP doped by Nd3+increasing from 1.825 to 2.081 with increasing concentrations of modifier Nd2O3from 0,5 %mol to 2,5 %mol. The addition of cations on the network structure of the glass affected to the glass structure which lead to a local change of the distribution of Bridging Oxygen (BO) and Non Bridging Oxygen (NBO) bond. The addition of Nd3+ concentration caused an increasing of the value of the parameters of physical properties such as molar mass, density, molar volume, and molar refraction.


Keywords


refractive index; tellurite glass; brewster angle method; melt quenching technique.

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