Coherent light generators – Particular resonant cavity – Specified cavity component
Patent
1990-08-03
1992-06-30
Scott, Jr., Leon
Coherent light generators
Particular resonant cavity
Specified cavity component
372108, 372 55, 359580, 359589, H01S 308
Patent
active
051270188
ABSTRACT:
The structure of the output mirror of a He-Ne laser tube is represented as "Sub. .vertline.H.multidot.n.sub.1 L.multidot.(H.multidot.L).sub.4 .multidot.H.multidot.n.sub.2 L.vertline. Air" wherein Sub. is a transparent substrate; H and L are layers of high refractive index material and low refractive index material, respectively, stacked alternately to form multilayer dielectric coatings; (H.multidot.L).sub.4 stands for a series of four layer pairs each consisting of high refractive index material layer and low reflective index material layer stacked alternately H and L; Air stands for an atmosphere to which the top surface of the multilayer coating is exposed; each of H and L has a thickness of .lambda..sub.0 /4; .lambda..sub.0 is 6328 .ANG.; n.sub.1 is a natural number selected from the group consisting of 3, 5 and 7; and n.sub.2 is a natural number determined by n.sub.2 =9-n.sub.1. Likewise a preferred multilayer structure of the total reflection mirror is represented as "Sub. .vertline.(H.multidot.L).sub.11 .multidot.H.multidot.7L.vertline. Air". Use of these mirrors effects increase in reflectivity at .lambda..sub. 0 =6328 .ANG. and reduction in reflectivity at .lambda.=3.39 .mu.m to not more than 1%. Thus it can be achieved to increase power output at .lambda..sub.0 =6328 .ANG..
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Jr. Leon Scott
NEC Corporation
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