By Katherine Mardon Davis
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Extra info for Light from Beyond: As Taken Over the Ouija Board
It then flops back to G (4), emitting an identical photon in phase with the first (laser action). 8 (a) In a ruby laser, the laser rod and the flashtube are positioned at the conjugate foci of an elliptical reflecting cylinder. (b) All rays emanating from one focus of an ellipse are reflected to pass through the other focus. 9 A simple ruby laser produces a series of pulses over roughly 1 ms. 32 Copyright 2004 IOP Publishing Ltd Light sources for holography the range of its applications was severely limited, largely because its light was squandered in the form of a succession of mini-pulses spread over a millisecond or so.
N. , ‘Reconstructed wavefronts and communication theory’, Journal of the Optical Society of America, Vol. 52, 1962, pp. 1123–30Ã . 5. , ‘The legacy of Denis Gabor’, Holosphere, Vol. 10, 1981, pp. 5–7. 6. , ‘Photographic reconstruction of the optical properties of an object in its own scattered radiation ﬁeld’, Journal of the Optical Society of America, Vol. 53, 1962, pp. 1377–81Ã . 7. N. , ‘Wavefront reconstruction with diﬀused illumination and three-dimensional objects’, Journal of the Optical Society of America, Vol.
These are known as ampliﬁers, and are also excited to the point of laser action. They 33 Copyright 2004 IOP Publishing Ltd Practical Holography This is something like the power consumption of a moderate-sized city! boost the energy of the emerging beam by a factor of up to 100, giving a maximum output of up to 10 joules, plenty of energy for adequate exposure of a large holographic plate or ﬁlm. As the pulse duration is only about 25 nanoseconds, this represents an instantaneous power of 400 megawatts.