Patent ID: 8493650
Filing Date: 2013-07-23
Classification: H01S

Abstract:
1. An apparatus for reducing four-wave mixing (FWM), comprising: a master oscillator (MO) configured to generate a beam; a polarization controller configured to receive the beam from the MO and to transmit the beam with a desired polarization; a pre-amplifier configured to receive the beam from the polarization controller, to pre-amplify the beam, and to transmit the beam; a high power fiber amplifier configured to receive the beam from the pre-amplifier, to amplify the beam, and to transmit an output beam; and a polarization detector configured to detect the polarization of the output beam, the polarization detector further configured to transmit feedback to the polarization controller to ensure that the output beam polarization components are aligned with the principal birefringent axes of the high power fiber amplifier so as to have approximately equal power polarized along one or more of the two axes.