It also includes an analysis of laser combining schemes,which is mainly about the characteristics of the coherent beam combining(CBC),as well as the feasibility of devising an all-fiber CBC scheme with better performance.

The concept of coherent beam combining, the current status, the future research aspec

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.