Kilowatt Coherent Beam Combining of High‐Power Fiber Amplifiers Using Single‐Frequency Dithering Techniques

A novel coherent beam combining system based on active polarization-and-phase control

“…With the development of fiber material, device and laser technologies, the output power of fiber laser from a single fiber has reached 10 kW level [1,2], which is close to the physical limit and beam combining turns to be the most effective method to further scale up the power. Among the various combining approaches, coherent beam combining (CBC) is quite promising since it can obtain high beam quality while maintaining the laser spectral purity, therefore, CBC has found potential applications in laser pointing, free space laser communication, laser transmission and many other fields [3][4][5][6]. For the purpose of long-term reliability in harsh environment, all-fiberized CBC is considered to be more advantageous than the traditional free-space CBC, and thus it has attracted many researchers to develop the relative technologies, including the active polarization-and-phase control.…”