DIFFRACTION ATTENUATOR WITH ALTERNATING TRANSMISSION Russian patent published in 2006 - IPC G02B5/20 G02B27/46 

FIELD: attenuators, possible use for smooth adjustment of intensiveness of high power optical radiation in ultraviolet spectrum.

SUBSTANCE: attenuator consists of plate made of optical material with surface layer, made in form of diffracting screen. Diffracting screen is made circular, while fingers are made in form of series of recesses or projections. Attenuator is made with possible rotation in angular direction relatively to center of diffracting screen. Surface layer is made additionally containing circular zone with one non-transparent finger and with a series of non-transparent fingers.

EFFECT: high beam resistance and high light transmission when used in ultraviolet spectrum.

5 cl, 3 dwg