1987-06-01
1988-05-31
Arnold, Bruce Y.
350408, 350166, G02F 121, G02B 528
Patent
active
047476737
ABSTRACT:
An attenuator for high power laser beams, the attenuator has an annular b dump through which the beam passes diametrically and in which the beam passes successively through a pair of pivoting transmissive and reflective element. These elements are individually mounted on intermeshed gears so that the elements are adjustable through equal and opposite angles. At each element a portion of the beam is reflected toward the dump and a portion transmitted, the relative energy in each portion being determined by the angle of the elements to the beam so that adjustment of this angle determines the amount of attenuation. The beam is offset oppositely by refraction at each element so that the attenuator does not change the beam path. The elements are, preferably, elements commonly used as edge filters, that is, interference filters having an abrupt monotonic transition with wavelength from reflection to transmission.
REFERENCES:
patent: 2941444 (1960-06-01), Frykman
Faith William N.
Marrs C. Denton
Arnold Bruce Y.
Church Stephen J.
Skeer W. Thom
The United States of America as represented by the Secretary of
Townsend W. C.
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