Abstract

The sequence of phenomena occurring when a ruby laser crystal is flashed is studied on a microsecond time scale by means of a high-speed framing camera making about 500,000 frames per second. Two runs of photographs are presented. The individual bursts of light constituting the laser flash show the following characteristics: Each burst involves the whole active volume of the crystal; each burst shows a grainy or flocculated distribution of light across the face of the crystal, and this distribution changes in fine detail from frame to frame; the grains of brightness are often arranged in stripes and bands in patterns which change from frame to frame; there are some permanently dark regions; there are some pinholes in the silver coating which scatter an appreciable amount of light out of the main beam.

© 1962 Optical Society of America

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References

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  1. Good reviews of laser phenomena have been given by A. L. Schawlow, Solid State J. 2, 21 (1961), and byT. H. Maiman et al., Phys. Rev. 123, 1151 (1961).
    [CrossRef]
  2. A description of this type camera has been given byM. C. Kurtz, J. Soc. Motion Picture Television Engrs. 68, 16 (1959).

1961

Good reviews of laser phenomena have been given by A. L. Schawlow, Solid State J. 2, 21 (1961), and byT. H. Maiman et al., Phys. Rev. 123, 1151 (1961).
[CrossRef]

1959

A description of this type camera has been given byM. C. Kurtz, J. Soc. Motion Picture Television Engrs. 68, 16 (1959).

Kurtz, M. C.

A description of this type camera has been given byM. C. Kurtz, J. Soc. Motion Picture Television Engrs. 68, 16 (1959).

Schawlow, A. L.

Good reviews of laser phenomena have been given by A. L. Schawlow, Solid State J. 2, 21 (1961), and byT. H. Maiman et al., Phys. Rev. 123, 1151 (1961).
[CrossRef]

J. Soc. Motion Picture Television Engrs.

A description of this type camera has been given byM. C. Kurtz, J. Soc. Motion Picture Television Engrs. 68, 16 (1959).

Solid State J.

Good reviews of laser phenomena have been given by A. L. Schawlow, Solid State J. 2, 21 (1961), and byT. H. Maiman et al., Phys. Rev. 123, 1151 (1961).
[CrossRef]

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Figures (2)

Fig. 1
Fig. 1

End face of “Lasing” ruby. The ruby had shifted in its holder allowing a thin lune of pumping light to show at the top. The frames are labeled in microseconds but it is not known at which frame the flash begins. The camera was focused on the face of the ruby but focusing was somewhat imperfect. This flash was made with a pumping energy about 9% above threshold, crystal at room temperature, and with a silver coating of rather indifferent quality. No auxiliary lens was used and the original image was about 0.16 cm in diameter. Plus-X film.

Fig. 2
Fig. 2

End face of “Lasing” ruby. Frames labeled in microseconds with arbitrary zero. Camera better focused on ruby face than in Fig. 1. Pumping energy about 110% above threshold, crystal at room temperature, silver coating of good quality protected by layer of SiO which had probably oxidized to SiO2. Aero Ektar auxiliary lens used providing an image on the film of about 1.3 cm diameter. Plus-X film.

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