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Showing position of camera for photographing tattoo on fingers before and after laser impacts. Fig. 6-2. Showing position of wide -angle-lens camera for photographing laser impact. Laser Photography and Laser Holography 41 necessary to add that darkening of the room increases the eye hazards of the laser. COLOll PHOTOGRAPHY Color presents, of course, a much more vivid display of the laser impact than does black-and-white photography. Color photography, in addition, is a useful detecting device in studies of second and even third harmonics.

Conventional still and high-speed cine cameras, even as high as a million frames per second, have been used. For the study of the biomedical applications of the laser, pre-impact, impact and post-impact pictures are done, usually in color. For most of the industrial applications of the laser, such as in welding and drilling, black-and-white pictures are usually taken. However, photography in color presents a vivid picture of the impact of the laser, even in industrial processes. Dramatic photographs have been taken to display showers of molten metal or shattering of diamond particles.

Harmonic generation in IR with C0 2 laser. Physical Review Letters, 14:613, 1966. Rockwell, R. : Personal communication. - - - and P. Hornby: Some aspects of biomedical laser instrumentation. Proc. Symposium on Biomedical Engineering, Marquette University, Milwaukee, Wisconsin, Vols. 1, 199, p. 323, 1966. Young, C. : A sun-pumped CW one-watt laser. Applied Optics, 5:993, 997, 1966. 3 Laser Output Detection It is, of course, necessary to know the output of the laser. In the biomedical field it is much more important to be precise and accurate.

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