Reducing fluctuations in a radiation beam characteristic

Details Reducing fluctuations in a radiation beam characteristic Reducing fluctuations in a radiation beam characteristic

G - Physics

02

F

315/24

G02F 1/01 (2006.01) G02F 2/00 (2006.01) H04B 10/18 (2006.01)

Patent

CA 1283694

ABSTRACT A method and apparatus for reducing fluctuations such as phase noise in a characteristic of a coherent beam of radiation is described. The apparatus comprises an interferometer for sensing the fluctuation at the first position to generate an interference beam. The interference beam is incident on a radiation detector such as a photodiode which generates an electrical output signal responsive to the intensity of the incident beam. This signal is amplified by an amplifier and fed to a phase modulator. Another portion of the original laser beam is also fed to the phase modulator. The arrangement is such that the phase modulations applied to the beam by the phase modulator under the control of the signal from the detector reduce or cancel the phase noise in the original beam.

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