Coherent light generators – Particular component circuitry – Optical pumping
Patent
1986-01-29
1988-05-17
Sikes, William L.
Coherent light generators
Particular component circuitry
Optical pumping
350 9618, 350 9628, 372 9, 372 57, 362259, 362 32, 219121LA, 219121LT, G02B 600, H01S 310, F21V 704
Patent
active
047446153
ABSTRACT:
A coherent laser beam having a possibly non-uniform spatial intensity distribution is transformed into an incoherent light beam having a substantially uniform spatial intensity distribution by homogenizing the laser beam with a light tunnel (a transparent light passageway having flat internally reflective side surfaces). It has been determined that when the cross-section of the tunnel is a polygon (as preferred) and the sides of the tunnel are all parallel to the axis of the tunnel (as preferred), the laser light at the exit of the light tunnel (or alternatively at any image plane with respect thereto) will have a substantially uniform intensity distribution and will be incoherent only when the aspect ratio of the tunnel (length divided by width) equals or exceeds the contangent of the input beam divergence angle .theta. and when
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"Design Ideas", by K. Iwasaki et al, Laser & Applications, Apr. 1983, p. 76.
"A Light Pipe for Flux Collection", by H. D. Wolpert, Lasers & Applications, Apr. 1983, pp. 73-74.
Fan Bunsen
Tibbetts Raymond E.
Wilczynski Janusz S.
Witman David F.
Drumheller Ronald L.
Goodwin John J.
Healy Brian M.
International Business Machines - Corporation
Sikes William L.
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