111

YAG (undoped)

Sapphire

BaF2

CaF2

Infrasil
1)

Fused silicia (UV)

BK7
2)

SF10
2)

Wavelength range free of absorption

400nm-4μm

400nm-4μm

400nm-10μm

130nm-7μm

300nm-3μm

190nm-2μm
3)

400nm-1.8μm

400nm-4μm

Refractive index at

200nm

1.49516

1.55051

300nm

1.45403

1.48779

500nm

1.8450

1.775

1.479

1.43648

1.46233

1.46243

1.5412

1.7432

1μm

1.8197

1.756

1.468

1.42888

1.45042

1.45051

1.5075

1.7039

3μm

1.7855

1.71

1.461

1.41785

1.441941

5μm

1.624

1.451

1.39896

9μm

1.408

1.32677

Absorbing in 3μm region

no

no

no

no

yes

yes

yes

yes

Absorbing in 940nm region

For higher power applications at 940nm we recommend the fused silicia SUPRASIL 300
1)
and SUPRASIL 3001/30021)

Birefringence

no

yes

no

no4)

no

no

no

no

Thermal expansion coefficient

[10-6K]
5)

7

5

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