Ray D Brown

Address:

121 Indigo Brush Dr, Cibolo, TX 78108

Phone:

2105665620

VIN:

2G1FC1ED9B9189381

Make:

CHEVROLET

Model:

CAMARO

Year:

2011

US Patent:

41925734, Mar 11, 1980

Filed:

Oct 13, 1978

Appl. No.:

5/951105

Inventors:

Ray B. Brown - Upper Marlboro MD

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

G02B 1706

US Classification:

350 55

Abstract:

An improved variable light beam power attenuator which uses a flat mirror d a focusing mirror fixed in a suitably movable structure. Linear movement of this structure varies the diameter of a spot of light illuminating a "diffraction-limited" aperture of a special shape. A second focusing mirror is provided to collect the "diffraction-limited" light transmitted by the aperture and to focus or collimate it. A second flat mirror may be used to re-direct the output beam. The mounting arrangement of the first two mirrors relative to the input light beam and the remainder of the power attenuator permit an all mirror system which requires only a single linear motion to change the power level of the transmitted beam. The use of an all-mirror system allows all the advantages of reflective optics over transmitting optics for high power CW (continuous wave) laser beam.