Theory of spectral beam combining of fiber lasers

Influence of transform-lens focal length on spectral beam combining in an external cavity with a microlens array

“…For the combining setup without microlens array, Bochove has established a mathematical model analyzing the cavity coupling efficiency [10,20]. For an emitter with off-axis distance X n , transverse offset Y, tilt angles θ x and θ y , considering a Gaussian mode field with waist spot radius w 1 , the coupling efficiency, defined as the fraction of light (with wavelength of λ) coupled back into the fiber core via the external cavity, is of the form:…”

“…It can be carried out by either volume Bragg gratings or surface diffraction gratings [8]. In the late 1990 s, an SBC setup based on a surface diffraction grating with spectral control of sources by optical feedback was proposed by Cook et al [9], and it was later theoretically described and analyzed [10]. To date, the highest output power of 100 W with M 2~2 .7 was obtained for the combining of three fiber lasers, with the corresponding spectral separation of 6.5 nm [8,11].…”

Analysis of beam quality for the laser beams after spectral beam combining

“…According to the principle of SBC [6][7][8], the simulation for beam combining can be divided into the following steps: (i) each individual beam emitted from the array plane passes through a spherically aberrated lens and is incident on the grating plane. (ii) All of the individual beams with different wavelengths and different incidence angles are made collimated by the grating.…”

The effect of different power spectral densities of refractive index on the propagation of coherently combined beams

“…An alternative approach is to use arrays of relatively lower power lasers by combining the outputs of multiple laser sources to obtain a single output beam [1][2][3][4][5]. In recent years, the propagation of a coherently combined beam in Obukhov-Kolmogorov (OK) turbulence has been extensively studied.…”