Abstract

A special type of double-layer antireflection coating for infrared optical materials is described. This coating has two unusual features: the total optical thickness of the double layer is less than one-quarter wavelength; and the film with the higher index of refraction is on the outside. The reduction in reflectance in the low reflecting region is similar to that of a single-layer coating. Measured values of transmittance are given for coatings on Si and Ge. An interesting point in one of the examples is the use of a Ge film in the antireflection coating for Ge. The coatings are very durable.

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  1. K. Schuster, Ann. Phys. 4, 352 (1949).
  2. J. T. Cox, G. Hass, and R. F. Rowntree, Vacuum IV, 445 (1954).
  3. J. T. Cox, G. Hass, and G. F. Jacobus, J. Opt. Soc. Am. 51, 714 (1961).

Cox, J. T.

J. T. Cox, G. Hass, and G. F. Jacobus, J. Opt. Soc. Am. 51, 714 (1961).

J. T. Cox, G. Hass, and R. F. Rowntree, Vacuum IV, 445 (1954).

Hass, G.

J. T. Cox, G. Hass, and R. F. Rowntree, Vacuum IV, 445 (1954).

J. T. Cox, G. Hass, and G. F. Jacobus, J. Opt. Soc. Am. 51, 714 (1961).

Jacobus, G. F.

J. T. Cox, G. Hass, and G. F. Jacobus, J. Opt. Soc. Am. 51, 714 (1961).

Rowntree, R. F.

J. T. Cox, G. Hass, and R. F. Rowntree, Vacuum IV, 445 (1954).

Schuster, K.

K. Schuster, Ann. Phys. 4, 352 (1949).

Other (3)

K. Schuster, Ann. Phys. 4, 352 (1949).

J. T. Cox, G. Hass, and R. F. Rowntree, Vacuum IV, 445 (1954).

J. T. Cox, G. Hass, and G. F. Jacobus, J. Opt. Soc. Am. 51, 714 (1961).

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