title: Power scaling of a fiber master oscillator power amplifier system using a coherent polarization beam combination.
abstract: A new coherent polarization beam combination (CPBC) architecture was employed to combine four amplified beams and produce over 25 W of coherent output with 94% efficiency and nearly diffraction-limited beam quality. The individual beams were produced by a fiber master oscillator power amplifier system and their phases were controlled and locked using servo-controlled phase modulators. The CPBC approach relies on a coherent superposition of orthogonal polarization states and allows the combination of an arbitrary number of beams with arbitrary power ratios.
authors.affiliation: Lockheed Martin Coherent Technologies, 135 South Taylor Avenue, Louisville, Colorado 80027, USA. radek.uberna@lmco.com
authors.forename: Radoslaw
authors.initials: R
authors.lastname: Uberna
authors.forename: Andrew
authors.initials: A
authors.lastname: Bratcher
authors.forename: Bruce G
authors.initials: BG
authors.lastname: Tiemann