High average power fiber laser system with phase conjugation

Details High average power fiber laser system with phase conjugation High average power fiber laser system with phase conjugation

H - Electricity

01

S

H01S 3/05 (2006.01) H01S 3/067 (2006.01) H01S 3/10 (2006.01) H01S 3/23 (2006.01)

Patent

CA 2278072

A relatively high average power optical laser utilizes a diode pumped multi- mode dual-clad fiber amplifier configured for double pass amplification to provide a relatively higher average power than single mode fiber amplifiers. In order to compensate for mode scrambling and depolarization from the multi-mode fiber amplifier, the output beam from the mufti-mode fiber amplifier is applied to a vector phase conjugator after a single pass through the amplifier and reflected back into the amplifier. The vector phase conjugator conjugates the electric field amplitude, phase and polarization and reflects a conjugate wave back into the mufti-mode fiber amplifier in a reverse direction. The propagation of the conjugate wave through the amplifier unscrambles mode mixing and restores the beam back to its original polarization state. A Faraday rotator and polarization beam splitter are used to outcouple an output beam after the second pass through the mufti-mode fiber amplifier.

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