The calculated results show that the beam generated by a multi-feeds parabolic reflector antenna is a coherent beam not a multi-beam when the distance of feeds reduced.

An analysis of raw data from GeoSwath,an interferometric multibeam sonar system;

The principle of double cladding fiber laser is analyzed,simply illustrated the principle and drawbacks of noncoherent beam combination,the coherent beam combination method of multiple optical power amplifier and its advantages are discussed in detail.

The latest progress on high power laser was presented, the potence of coherent beam combination of fiber laser was analyzed.

The recent techniques of coherent beam combination of fiber lasers are briefly introduced.

Aiming at phase-detecting of each individual beam in coherent beam combining of fiber laser array,a new method based on Fast Fourier Transform(FFT) was developed to detect the phase shift between individual array leg and reference beam.

Aiming at the problem that there is no comprehensive model of coherent beam combining through superposed volume gratings, we establish a comprehensive model for two-beams combining and its analytic formula is derived using coupled wave theory.

In the paper some newly developed technologies on all-fiber coherent beam combining are introduced.