Abstract

A point-diffraction interferometer (PDI) for use in the infrared is discussed. It is shown that the PDI is simple and easy to use and also yields fringes of constant optical path difference similar to those obtained with a Twyman–Green interferometer. The fabrication of the PDI is described, and typical results obtained using the interferometer at a wavelength of 10.6 μm are shown.

© 1978 Optical Society of America

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References

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  1. R. N. Smartt, J. Strong, J. Opt. Soc. Am. 62, 737 (1972).
  2. R. N. Smartt, W. H. Steel, Japan J. Appl. Phys., Suppl. 14-1 14, 351 (1975).
  3. Microballoons are hollow glass or resin spheres available from the 3M Corporation.

1975 (1)

R. N. Smartt, W. H. Steel, Japan J. Appl. Phys., Suppl. 14-1 14, 351 (1975).

1972 (1)

R. N. Smartt, J. Strong, J. Opt. Soc. Am. 62, 737 (1972).

Smartt, R. N.

R. N. Smartt, W. H. Steel, Japan J. Appl. Phys., Suppl. 14-1 14, 351 (1975).

R. N. Smartt, J. Strong, J. Opt. Soc. Am. 62, 737 (1972).

Steel, W. H.

R. N. Smartt, W. H. Steel, Japan J. Appl. Phys., Suppl. 14-1 14, 351 (1975).

Strong, J.

R. N. Smartt, J. Strong, J. Opt. Soc. Am. 62, 737 (1972).

J. Opt. Soc. Am. (1)

R. N. Smartt, J. Strong, J. Opt. Soc. Am. 62, 737 (1972).

Japan J. Appl. Phys. (1)

R. N. Smartt, W. H. Steel, Japan J. Appl. Phys., Suppl. 14-1 14, 351 (1975).

Other (1)

Microballoons are hollow glass or resin spheres available from the 3M Corporation.

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Figures (4)

Fig. 1
Fig. 1

Infrared point-diffraction interferometer.

Fig. 2
Fig. 2

Transmission of semitransparent coating versus PDI position to achieve unity contrast for unaberrated wavefront. Pinhole diameter in Airy disk units: + = 0.1, ◬ = 0.2, ⊡ = 0.3, ⊙ = 0.4, · = 0.5, × = 0.6.

Fig. 3
Fig. 3

Infrared PDI interferogram obtained testing f/6 lens: (a) tilt fringes produced by lateral displacement of PDI pinhole from optic axis; (b) tilt and defocus fringes produced by lateral and longitudinal displacement of PDI from paraxial focus.

Fig. 4
Fig. 4

Fringe contrast versus PDI position for unaberrated wavefront. Results for the PDI coating transmission optimized for three different pinhole positions are illustrated. Pinhole diameter in Airy disk units: ⊙ = 0.4, · = 0.5, × = 0.6.

Equations (3)

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u ( x , y ) = cyl [ ( x 2 + y 2 ) 1 / 2 D ] exp [ ( i 2 π / λ ) W ( x , y ) ] ,
t ( x , y ) = τ b + ( 1 - τ b ) × cyl { [ ( x - x 0 ) 2 + ( y - y 0 ) 2 ] 1 / 2 d } ,
u ( x , y ) = τ b cyl [ ( x 2 + y 2 ) 1 / 2 D ] exp [ ( i 2 π / λ ) W ( x , y ) ] + ( 1 - τ b ) π 4 d 2 λ f exp [ - i 2 π x 0 x / λ f ) ] exp [ ( - i 2 π y 0 y ) / λ f ] × 2 J 1 [ ( π d / λ f ) ( x 2 + y 2 ) 1 / 2 ] ( π d / λ f ) ( x 2 + y 2 ) 1 / 2 * cyl [ ( x 2 + y 2 ) 1 / 2 D ] exp [ ( i 2 π / λ ) W ( x , y ) ] ,

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