Abstract

Examples are given of the application of a thin film of manganese bismuth to recording the irradiance distributions in high-power laser beams of the type used in plasma and fusion research. The erasable nature and high resolution of the record and the facility for contrast reversal are emphasized, as is the nonlinear relationship between irradiance of the laser beam and the magneto-optical contrast. Important physical parameters of the recording medium are tabulated.

© 1981 Optical Society of America

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References

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  1. R. P. Hunt, “Magneto-optics, lasers and memory systems,” IEEE Trans. Mag. M-5, 700–716 (1969).
    [CrossRef]
  2. D. Chen, J. F. Ready, G. E. Bernal, “MnBi thin films: physical properties and memory applications,” J. Appl. Phys. 39, 3916–3927 (1968).
    [CrossRef]
  3. R. Atkinson, P. H. Lissberger, “Determination of the optical and magneto-optical constants of thin film manganese bismuth in the visible spectrum,” Int. J. Mag. 6, 227–241 (1974).
  4. R. Atkinson, “The dependence of the coercivity of thin MnBi on composition, structure and thickness,” Int. J. Mag. 6, 253–258 (1974).
  5. United States Naval Research Laboratory Report 3315, 21 (1974–1975).

1974

R. Atkinson, P. H. Lissberger, “Determination of the optical and magneto-optical constants of thin film manganese bismuth in the visible spectrum,” Int. J. Mag. 6, 227–241 (1974).

R. Atkinson, “The dependence of the coercivity of thin MnBi on composition, structure and thickness,” Int. J. Mag. 6, 253–258 (1974).

1969

R. P. Hunt, “Magneto-optics, lasers and memory systems,” IEEE Trans. Mag. M-5, 700–716 (1969).
[CrossRef]

1968

D. Chen, J. F. Ready, G. E. Bernal, “MnBi thin films: physical properties and memory applications,” J. Appl. Phys. 39, 3916–3927 (1968).
[CrossRef]

Atkinson, R.

R. Atkinson, P. H. Lissberger, “Determination of the optical and magneto-optical constants of thin film manganese bismuth in the visible spectrum,” Int. J. Mag. 6, 227–241 (1974).

R. Atkinson, “The dependence of the coercivity of thin MnBi on composition, structure and thickness,” Int. J. Mag. 6, 253–258 (1974).

Chen, D.

D. Chen, J. F. Ready, G. E. Bernal, “MnBi thin films: physical properties and memory applications,” J. Appl. Phys. 39, 3916–3927 (1968).
[CrossRef]

E. Bernal, G.

D. Chen, J. F. Ready, G. E. Bernal, “MnBi thin films: physical properties and memory applications,” J. Appl. Phys. 39, 3916–3927 (1968).
[CrossRef]

Hunt, R. P.

R. P. Hunt, “Magneto-optics, lasers and memory systems,” IEEE Trans. Mag. M-5, 700–716 (1969).
[CrossRef]

Lissberger, P. H.

R. Atkinson, P. H. Lissberger, “Determination of the optical and magneto-optical constants of thin film manganese bismuth in the visible spectrum,” Int. J. Mag. 6, 227–241 (1974).

Ready, J. F.

D. Chen, J. F. Ready, G. E. Bernal, “MnBi thin films: physical properties and memory applications,” J. Appl. Phys. 39, 3916–3927 (1968).
[CrossRef]

IEEE Trans. Mag.

R. P. Hunt, “Magneto-optics, lasers and memory systems,” IEEE Trans. Mag. M-5, 700–716 (1969).
[CrossRef]

Int. J. Mag.

R. Atkinson, P. H. Lissberger, “Determination of the optical and magneto-optical constants of thin film manganese bismuth in the visible spectrum,” Int. J. Mag. 6, 227–241 (1974).

R. Atkinson, “The dependence of the coercivity of thin MnBi on composition, structure and thickness,” Int. J. Mag. 6, 253–258 (1974).

J. Appl. Phys.

D. Chen, J. F. Ready, G. E. Bernal, “MnBi thin films: physical properties and memory applications,” J. Appl. Phys. 39, 3916–3927 (1968).
[CrossRef]

Other

United States Naval Research Laboratory Report 3315, 21 (1974–1975).

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Figures (3)

Fig. 1
Fig. 1

Principle of Curie-point writing.

Fig. 2
Fig. 2

Laser-beam irradiance distribution (12 mJ in five 1-nsec pulses at intervals of 10 nsec; energy spread over 25 mm2) for a system consisting of a Nd3+:YAG polarized mode-locked oscillator and single amplifier operating at 1.06 μm. (a) First contrast state, (b) reversed contrast, (c) erased.

Fig. 3
Fig. 3

Irradiance distribution (2.5 mJ in five 0.1-nsec pulses at intervals of 10 nsec; energy spread over 1.3 mm2) at the focus of a cylindrical lens placed in the beam from the oscillator at 1.06 μm. (a) First contrast state, (b) reversed contrast, (c) erased, (i) 70% of maximum irradiance, (ii) maximum irradiance.

Tables (1)

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Table 1 Relevant Constants of MnBi

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