Abstract
In the construction of thin film interference filters, It is necessary to have materials with various indices of refraction. Thorium fluoride (ThF4) is an excellent material for use from the near ultraviolet to the far infrared spectral range. It has a low index of refraction, moderate stress in thin film form (20kpsi)(1), and it is environmentally very robust. The primary disadvantage of using ThF4 is its radioactivity.
© 1995 Optical Society of America
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