Phased cascading of multiple nonlinear optical elements for frequency conversion
 Optical frequency doubling apparatus is disclosed having a system output portion and a source of coherent radiation together with a plurality of discreet nonlinear light transmissive devices positioned in series between the source of coherent radiation and the system output portion, and further including a phase shifter positioned in series with the nonlinear light transmissive devices for altering the phase of light wavefronts passing therethrough. A harmonic beamsplitter is used to separate the frequency doubled output from the coherent light inputted into the system by the source of coherent radiation. 
The United States of America as represented by the Secretary of the Air Force
G
G02F
inventional
Karl W. Mark T. Gerald T. Stephen H.
Koch, III Gruneisen Moore Chakmakjian