Abstract

A cascaded planarized holographic optical sensor consisting of a combination of a leaky beam splitter and a polarization beam splitter is evaluated for possible use in magneto-optic data storage pickup heads. The performance requirements for each element are specified, and two cascaded grating designs are considered. In one design we reconstruct the gratings with the grating vector in the plane of incidence, using a half-wave plate. In the second design we reconstruct the gratings with the grating vector of the polarization beam splitter out of the plane of incidence without using a half-wave plate. The two systems are fabricated with gratings formed in dichromated gelatin emulsions, and they can detect 0.5° rotations in the polarization state of an incident beam by use of a differential detection system.

© 1994 Optical Society of America

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References

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  1. Digest of Joint International Symposium on Optical Memory and Optical Data Storage (Institute of Electrical and Electronics Engineers, New York, 1993).
  2. J. Jahns, A. Huang, Appl Opt. 28, 1602 (1989).
    [CrossRef] [PubMed]
  3. K. Iga, Fundamentals of Microoptics (Academic, New York, 1984).
  4. A. B. Marchant, Optical Recording, A Technical Overview (Addison-Wesley, Reading, Mass., 1990), Chap. 8.
  5. H. Kogelnik, Bell Syst. Tech. J. 48, 2909 (1969).
  6. M. G. Moharam, T. K. Gaylord, J. Opt. Soc. Am. 73, 1105 (1983).
    [CrossRef]

1989

J. Jahns, A. Huang, Appl Opt. 28, 1602 (1989).
[CrossRef] [PubMed]

1983

1969

H. Kogelnik, Bell Syst. Tech. J. 48, 2909 (1969).

Gaylord, T. K.

Huang, A.

J. Jahns, A. Huang, Appl Opt. 28, 1602 (1989).
[CrossRef] [PubMed]

Iga, K.

K. Iga, Fundamentals of Microoptics (Academic, New York, 1984).

Jahns, J.

J. Jahns, A. Huang, Appl Opt. 28, 1602 (1989).
[CrossRef] [PubMed]

Kogelnik, H.

H. Kogelnik, Bell Syst. Tech. J. 48, 2909 (1969).

Marchant, A. B.

A. B. Marchant, Optical Recording, A Technical Overview (Addison-Wesley, Reading, Mass., 1990), Chap. 8.

Moharam, M. G.

Appl Opt.

J. Jahns, A. Huang, Appl Opt. 28, 1602 (1989).
[CrossRef] [PubMed]

Bell Syst. Tech. J.

H. Kogelnik, Bell Syst. Tech. J. 48, 2909 (1969).

J. Opt. Soc. Am.

Other

K. Iga, Fundamentals of Microoptics (Academic, New York, 1984).

A. B. Marchant, Optical Recording, A Technical Overview (Addison-Wesley, Reading, Mass., 1990), Chap. 8.

Digest of Joint International Symposium on Optical Memory and Optical Data Storage (Institute of Electrical and Electronics Engineers, New York, 1993).

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Figures (5)

Fig. 1
Fig. 1

Schematic of design A for sensing polarization signals, consisting of a cascaded LBS, an on-axis half-wave plate, and a PBS.

Fig. 2
Fig. 2

Schematic of design B for sensing polarization signals, consisting of a cascaded LBS and a PBS.

Fig. 3
Fig. 3

Experimental data for efficiency versus reconstruction angle of an unstated holographic PBS that diffracts p-polarized (ηp) and transmits s-polarized (Ts) light. The Bragg angle is 42° in air, the construction angles are ±30°, the emulsion thickness is 8.5 μm, and the reconstruction wavelength is 632.8 nm.

Fig. 4
Fig. 4

Design A demonstration experiment results. (a) Differential signal (thick trace) and reference signal (thin trace) when analyzer is rotated +0.5°. (b) Differential signal (thick trace) and reference signal (thin trace) when analyzer is rotated −0.5°. The amplifier gain is ~100, and the signal is 2.03 V.

Fig. 5
Fig. 5

Design B demonstration experiment results. (a) Differential signal (thick trace) and reference signal (thin trace) when analyzer is rotated +0.5°.(b) Differential signal (thick trace) and reference signal (thin trace) when analyzer is rotated −0.5°. The amplifier gain is ~100 and the signal is 1.875 V.

Equations (2)

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η p = sin 2 [ π n 1 d λ ( cos θ i cos θ d ) 1 / 2 r ^ s ^ ] ,
η s = sin 2 [ π n 1 d λ ( cos θ i cos θ d ) 1 / 2 ] ,

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