Abstract

A high-bandwidth scanning Fabry–Perot wavemeter using polarizing reflectors is developed for far-infrared and millimeter waves. The strip directions of the two striped polarizing reflectors are made slightly different, and the reflectivity finesse is varied according to the relative angle of the two strip directions. By adjusting this angle one obtains the fringes of Fabry–Perot interference for a wide range of far-infrared and millimeter wavelengths. Experimental results show that the wavelength measurement range is approximately 100 to 3000 μm.

© 1989 Optical Society of America

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References

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  1. M. Born, E. Wolf, Principles of Optics (Pergamon, Oxford, UK, 1965).
  2. K. Sakai, L. Genzel, in Reviews of IR and MM Waves, K. J. Button, ed. (Plenum, New York, 1983), Vol. 1, p. 155.
    [CrossRef]
  3. E. A. M. Baker, B. Walker, J. Phys. E 5, 25 (1982).
    [CrossRef]
  4. T. Hori, T. Matsui, K. Araki, H. Inomata, in Digest of Twelfth International Conference on Infrared and Millimeter Waves (Institute of Electrical and Electronics Engineers, New York, 1987), p. 269.
  5. N. Marcuvitz, Waveguide Handbook (McGraw-Hill, New York, 1951).

1982 (1)

E. A. M. Baker, B. Walker, J. Phys. E 5, 25 (1982).
[CrossRef]

Araki, K.

T. Hori, T. Matsui, K. Araki, H. Inomata, in Digest of Twelfth International Conference on Infrared and Millimeter Waves (Institute of Electrical and Electronics Engineers, New York, 1987), p. 269.

Baker, E. A. M.

E. A. M. Baker, B. Walker, J. Phys. E 5, 25 (1982).
[CrossRef]

Born, M.

M. Born, E. Wolf, Principles of Optics (Pergamon, Oxford, UK, 1965).

Genzel, L.

K. Sakai, L. Genzel, in Reviews of IR and MM Waves, K. J. Button, ed. (Plenum, New York, 1983), Vol. 1, p. 155.
[CrossRef]

Hori, T.

T. Hori, T. Matsui, K. Araki, H. Inomata, in Digest of Twelfth International Conference on Infrared and Millimeter Waves (Institute of Electrical and Electronics Engineers, New York, 1987), p. 269.

Inomata, H.

T. Hori, T. Matsui, K. Araki, H. Inomata, in Digest of Twelfth International Conference on Infrared and Millimeter Waves (Institute of Electrical and Electronics Engineers, New York, 1987), p. 269.

Marcuvitz, N.

N. Marcuvitz, Waveguide Handbook (McGraw-Hill, New York, 1951).

Matsui, T.

T. Hori, T. Matsui, K. Araki, H. Inomata, in Digest of Twelfth International Conference on Infrared and Millimeter Waves (Institute of Electrical and Electronics Engineers, New York, 1987), p. 269.

Sakai, K.

K. Sakai, L. Genzel, in Reviews of IR and MM Waves, K. J. Button, ed. (Plenum, New York, 1983), Vol. 1, p. 155.
[CrossRef]

Walker, B.

E. A. M. Baker, B. Walker, J. Phys. E 5, 25 (1982).
[CrossRef]

Wolf, E.

M. Born, E. Wolf, Principles of Optics (Pergamon, Oxford, UK, 1965).

J. Phys. E (1)

E. A. M. Baker, B. Walker, J. Phys. E 5, 25 (1982).
[CrossRef]

Other (4)

T. Hori, T. Matsui, K. Araki, H. Inomata, in Digest of Twelfth International Conference on Infrared and Millimeter Waves (Institute of Electrical and Electronics Engineers, New York, 1987), p. 269.

N. Marcuvitz, Waveguide Handbook (McGraw-Hill, New York, 1951).

M. Born, E. Wolf, Principles of Optics (Pergamon, Oxford, UK, 1965).

K. Sakai, L. Genzel, in Reviews of IR and MM Waves, K. J. Button, ed. (Plenum, New York, 1983), Vol. 1, p. 155.
[CrossRef]

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Figures (4)

Fig. 1
Fig. 1

Layout of a variable-finesse Fabry–Perot wavemeter. The polarization of the incident wave is parallel to the strip direction of the first polarizer, the strip direction of the second polarizer is slightly rotated from that of the first, and the polarization of the transmitted wave is parallel to the strip direction of the second polarizer. In this configuration the reflectivity finesse can be varied.

Fig. 2
Fig. 2

Dependence of the reflectivity finesse on the rotation angles for various reflectivities. The effect of rotation, on the reflectivity finesse is large when R|| > 0.95, where R|| is the reflectivity for the parallel polarization. When R|| < 0.90 this effect is not so large.

Fig. 3
Fig. 3

Transmitted power plotted versus scan length for 118.8- and 170.6-μm oscillation. The oscillations of the optically pumped methanol laser are measured. The mesh parameters g and 2a are 40 and 20 μm, respectively, and the rotation angle is 0°.

Fig. 4
Fig. 4

FWHM of FPI fringes for various rotation angles and a wavelength of 3000 μm. The FWHM values are wider when the rotation angle is 9° than when the rotation angle is 0°.

Tables (1)

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Table 1 Comparison of Various Wavemeter Parameters

Equations (5)

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T + R = 1
P t / P in = 1 1 + [ 4 R / ( 1 - R ) 2 ] sin 2 δ ,
F t - 2 = F r - 2 + F d - 2 + F a - 2 ,
F t = F r π R 1 - R ,             R > 0.6
P t θ / P in = ( T | | cos θ 1 - R | | cos 2 θ ) 2 × 1 1 + [ 4 R | | cos 2     θ / ( 1 - R | | cos 2 θ ) 2 ] sin 2 δ ,

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