Table 2 Material properties of the films tested listed in the order which they damage.

From: Physical Origin of Early Failure for Contaminated Optics

Film

Absorption (ppm) and Film Type

Thermal Conductivity (Wm−1K−1)

Melting Point (K)

Bandgap (eV)

Titania

3.5 ppm λ/2

3

2048

3

Niobia

2 ppm DBR

1.5

1793

3.85

Tantala

12ppm λ/2, 0.7 ppm DBR

3

2191

4.3

Hafnia

35 ppm λ/2, 20 ppm DBR

1.2

3031

5.7

Alumina

30ppm λ/2

1.1

2345

7

Silica

1.5 ppm λ/2

1.1

1996

9

  1. The absorption before contamination, thermal conductivity, melting point, and bandgap energy are listed. Note of these parameters, only the bandgap follows the observed damage sequence of the materials tested, monotonically increasing as the materials better resist damage35,36,37,38,39,40,41,42.
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