Table 8 Optical properties of gamma-irradiated BBBNDy0 and BBBNDy3 glasses.

From: Influence of gamma irradiation on physical, structural, and optical properties of Dy3+ doped barium bismuth borate sodium glasses

Sample code

BBBNDy0

BBBNDy3

5 kGy

10 kGy

15 kGy

5 kGy

10 kGy

15 kGy

Direct band gap (eV) (error ± 0.001)

2.859

2.771

2.939

2.824

2.867

2.892

Indirect band gap (eV)

2.726

2.652

2.806

2.665

2.696

2.719

Urbach energy, \(E_{U}\) (eV)

0.256

0.285

0.247

0.298

0.293

0.288

Steepness parameter, S

0.101

0.091

0.105

0.087

0.088

0.098

Refractive index, n

2.436

2.462

2.414

2.446

2.434

2.427

Metallization criteria, M (error ± 0.0001)

0.9851

0.9850

0.9858

0.9856

0.9855

0.9856

Numerical aperture, NA

0.344

0.348

0.341

0.346

0.344

0.343

Reflection loss, \(R_{L}\)

0.175

0.178

0.172

0.176

0.174

0.173

Optical transmission, T

0.703

0.697

0.707

0.701

0.703

0.705

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