Coherent Beam Combining of Fiber Amplifiers in a kW Regime

An experimental demonstration of coherent combining applied to optical parametric oscillators

“…One way to overcome power limitations in fiber lasers induced by nonlinear effects such as stimulated Brillouin or Raman scattering, is to use coherent beam combining (CBC) techniques involving active phase control of the laser emitters. These have demonstrated their potential to power scale continuous-wave 1 and pulsed 2 fiber lasers through coherent addition of the power emitted by multiple separate amplifiers, reaching overall emitted power exceeding the kilowatt level. 1 The common wavelengths for high power fiber lasers are usually amongst 1 µm, 1.5 µm or 2 µm.…”

“…These have demonstrated their potential to power scale continuous-wave 1 and pulsed 2 fiber lasers through coherent addition of the power emitted by multiple separate amplifiers, reaching overall emitted power exceeding the kilowatt level. 1 The common wavelengths for high power fiber lasers are usually amongst 1 µm, 1.5 µm or 2 µm. Higher ones can be obtained through nonlinear processes using nonlinear crystals in order to convert these laser lines.…”

Theory of phase locking of Gaussian beam amplifier array based on multidithering technique

“…CBC using the multidithering technique is believed to be a promising approach to obtaining high-brightness laser beams [2][3][4][5]. At present, 1.4 kW overall output power by CBC of 16 laser beams using the multidithering technique has been demonstrated [6]. Although CBC with kilowatt high-power output has been demonstrated; nevertheless, the basic theory for CBC using the multidithering technique has been ignored for years, which may limit further power scaling of the CBC system.…”

Beam quality and noise properties of coherently combined ytterbium doped single frequency fiber amplifiers

“…One possibility to avoid these difficulties is to use two or more amplifiers and to coherently combine their output beams. In recent years, many improvements were reported in this field [5][6][7][8][9][10][11]. For gravitational wave detectors a narrow linewidth is required.…”