Coherent beam combining of high power quasi continuous wave tapered amplifiers

Albrodt, Philipp; Niemeyer, M.; Crump, P.; Hamperl, Jonas; Moron, Frédéric; Georges, Patrick; Lucas-Leclin, Gaëlle

doi:10.1364/oe.27.027891

Cited by 16 publications

(8 citation statements)

References 25 publications

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“…Coherent beam combining is difficult to apply for the complex system. Incoherent beam combining technology is the main method to realize high-power lasers [10][11][12][13][14][15]. Spectral beam combining which was proposed by MIT in 2000 is the most promising technology with the advantages of high beam quality (close to that of single emitter) and high outpower [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Sum frequency generation of semiconductor laser based on V-shaped spectral beam combining

Zhao,

Tong,

wei

2023

3rd International Conference on Laser, Optics, and Optoelectronic Technology (LOPET 2023)

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Two 808 nm semiconductor lasers were combined by V-shaped spectral beam combining and locked at 798.8 nm, and 800.5 nm respectively. The outpower power and beam quality in the slow axis were improved significantly. The sum frequency of semiconductor lasers was realized based on the laser source. A laser with an output power of 6.5 W and beam quality of M 2 = 2.2×18.5 was obtained by the spectral beam combining. The M 2 in slow axis was improved by 30% and the combining efficiency was 83%. The 399.9nm sum frequency laser at a power of 18.3mW was obtained and the efficiency of sum frequency generation was 0.28%.

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Section: Introductionmentioning

confidence: 99%

Sum frequency generation of semiconductor laser based on V-shaped spectral beam combining

Zhao,

Tong,

wei

2023

3rd International Conference on Laser, Optics, and Optoelectronic Technology (LOPET 2023)

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“…In 2011, Thales Research and Technology in France reported the coherent beam combining of 5 quantum-cascade lasers by a binary phase or Dammann grating [4]. All of the above solutions are coherent beam combining, which requires a high degree of coherence between different channel lasers and is hard to accomplished experimentally, especially when the number of lasers is large [5][6][7][8][9]. The feasibility of a spectral beam combining (incoherent beam combining) scheme was proposed by Christopher C. Cook et al at Lincoln Laboratory in 1999 [10] and was experimentally achieved for a semiconductor laser array in 2000, where the combined beam quality was almost identical to that of the single emitter [11], and in the same year, they have also successfully achieved spectral beam combining of 11-channel lasers [12].…”

Section: Introductionmentioning

confidence: 99%

A method to achieve spectral beam combining based on a novel symmetric grating

Fan

Zhang

et al. 2022

Front. Phys.

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A symmetric grating is proposed to obtain higher output power in spectral beam combination by increasing the number of lasers and spectral utilization. The grating allows laser beams to be incident from both sides of the grating normal to achieve coaxial beam combining, so the number of beams and the combined output power are doubled compared with the traditional grating under the same spectral line-width. The grating is designed with the central wavelength of 4.65 μm, and the calculation results show that this grating is very advantageous for spectral beam combining, especially for the light waves in the range 4.55–4.71 μm, where their diffraction efficiencies are high (over 80%) and correspond to a wide and linear range of incidence angles. Meanwhile, based on the symmetric gratings we further propose a circular grating to achieve the same frequency spectral beam combining. This beam combining design will not increase the laser spectral line width while enhancing the laser power, reducing the requirements for the unit laser spectral line width, which is very meaningful in some application fields and will further enrich the research of spectral beam combining.

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“…This is especially true in fiber lasers, where the high-energy pulses are confined to a small fiber core. To overcome this problem, many advanced techniques have been demonstrated, among which is coherent beam combining [14,15], pulse stacking [16], the use of tapered fiber amplifiers [17,18] and the use of optical fibers with large core diameters [19,20]. Although these systems offer some outstanding results in terms of power scaling, their relative complexity hinders their applicability in industrial laser applications.…”

Section: Introductionmentioning

confidence: 99%

Adaptive Nonlinear Phase Compensation in a Femtosecond Hybrid Laser with Varying Pulse Repetition Rate

2021

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In this manuscript, an implementation of a tunable nonlinear phase compensation method is demonstrated on a typical femtosecond hybrid laser consisting of a fiber pre-amplifier and an additional solid-state amplifier. This enables one to achieve constant laser pulse parameters over a wide range of pulse repetition rates in such a laser. As the gain in the solid-state amplifier is inversely proportional to the input power, the shortfall in the solid-state gain at higher repetition rates must be compensated for with fiber pre-amplifier to ensure constant pulse energy. This increases the accumulated nonlinear phase and consequently alters the laser pulse parameters such as pulse duration and Strehl ratio. To overcome this issue, the nonlinear phase must be compensated for, and what is more it should be compensated for to a different extent at different pulse repetition rates. This is achieved with a tunable CFBG, used also as a pulse stretcher. Using this concept, we demonstrate that constant laser pulse parameters such as pulse energy, pulse duration and Strehl ratio can be achieved in a hybrid laser regardless of the pulse repetition rate.

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Coherent beam combining of high power quasi continuous wave tapered amplifiers

Cited by 16 publications

References 25 publications

Sum frequency generation of semiconductor laser based on V-shaped spectral beam combining

Sum frequency generation of semiconductor laser based on V-shaped spectral beam combining

A method to achieve spectral beam combining based on a novel symmetric grating

Adaptive Nonlinear Phase Compensation in a Femtosecond Hybrid Laser with Varying Pulse Repetition Rate

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