Impact of temporal and spectral aberrations on coherent beam combination of nanosecond fiber lasers

Su, Rongtao; Zhang, Pu; Wang, Xiaolin; Zhang, Hanwei; Xu, Xiaojun

doi:10.1364/ao.52.002187

Cited by 8 publications

(7 citation statements)

References 22 publications

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“…The OPD induces a phase shift and reduces the temporal overlap of the optical pulses, which, in turn, leads to a decrease in the combining efficiency of the CBC system. The effect of OPD in pulsed lasers is more perilous than in CW lasers, which may lead to the entirely losing temporal overlap of the pulses [103,290,291]. In this regard, the shorter pulses (broader bandwidths) are more sensitive to OPD, resulting in more loss in combining efficiency.…”

Section: Optical Path Difference Controlmentioning

confidence: 99%

“…In comparison, for a pulse with double the bandwidth at 10 nm, this OPD difference requirement decreases to 12 µm. Furthermore, path length differences in CBC of pulsed lasers can induce extra phase difference between different pulses owing to the SPM and group velocity dispersion (GVD) consequently decreasing the combining efficiency [103,290,291]. Hence, compensating the OPD in the laser channel is crucial in the CBC systems.…”

Section: Optical Path Difference Controlmentioning

confidence: 99%

“…The primary technique for compensating the OPD is to add a delay line by splicing the extra fiber to the short channels, which might be highly suitable for the CW and nanosecond laser pulses with GHz linewidth [290]. However, for fine adjustment, which is needed for the CBC of ultrafast lasers, the variable optical delay line (VODL) with a resolution of less than 1 µm is desired [146,152,172,292].…”

Section: Optical Path Difference Controlmentioning

confidence: 99%

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Towards Ultimate High-Power Scaling: Coherent Beam Combining of Fiber Lasers

2021

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Fiber laser technology has been demonstrated as a versatile and reliable approach to laser source manufacturing with a wide range of applicability in various fields ranging from science to industry. The power/energy scaling of single-fiber laser systems has faced several fundamental limitations. To overcome them and to boost the power/energy level even further, combining the output powers of multiple lasers has become the primary approach. Among various combining techniques, the coherent beam combining of fiber amplification channels is the most promising approach, instrumenting ultra-high-power/energy lasers with near-diffraction-limited beam quality. This paper provides a comprehensive review of the progress of coherent beam combining for both continuous-wave and ultrafast fiber lasers. The concept of coherent beam combining from basic notions to specific details of methods, requirements, and challenges is discussed, along with reporting some practical architectures for both continuous and ultrafast fiber lasers.

show abstract

Section: Optical Path Difference Controlmentioning

confidence: 99%

Section: Optical Path Difference Controlmentioning

confidence: 99%

Section: Optical Path Difference Controlmentioning

confidence: 99%

See 1 more Smart Citation

Towards Ultimate High-Power Scaling: Coherent Beam Combining of Fiber Lasers

2021

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show abstract

“…The OPD induces a phase shift and reduces the temporal overlap of the optical pulses, which in turn leads to a decrease in the combining efficiency of the CBC system. The effect of OPD in pulsed lasers is more perilous rather than in CW lasers, which may lead to the entirely losing temporal overlap of the pulses [103,290,291]. In this regard, the shorter pulses (broader bandwidths) are more sensitive to OPD, resulting in more loss in combining efficiency.…”

Section: Optical Path Difference Controlmentioning

confidence: 99%

“…For instance, to realize a combining efficiency of 90 % for the pulse with a bandwidth of 5 nm (corresponding to the transform-limited pulse duration ≈ 310 fs at 1030 nm), the OPD must be less than 25 µm. In comparison for a pulse with double the bandwidth at 10 nm, this OPD difference requirement decreases to 12 µ m. Furthermore, path length differences in CBC of pulsed lasers can induce extra phase difference between different pulses owing to the SPM and group velocity dispersion (GVD consequently decreasing the combining efficiency [103,290,291]. Hence, compensating the OPD in the laser channel is crucial in the CBC systems.…”

Section: Optical Path Difference Controlmentioning

confidence: 99%

Towards Ultimate High-power Scaling: Coherent Beam Combing of Fiber Lasers

Fathi¹,

Närhi²,

Gumenyuk³

2021

Preprint

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Fiber laser technology has been demonstrated as a versatile and reliable approach for laser source manufacturing with a wide range of applicability in various fields ranging from science to industry. The power/energy scaling of single fiber laser systems has faced several fundamental limitations. To overcome them and to boost the power/energy level even further, combining the output powers of multiple lasers has become the primary approach. Among various combining techniques, the coherent beam combining of fiber amplification channels is the most promising approach, instrumenting ultra-high power/energy lasers with near-diffraction-limited beam quality. This paper provides a comprehensive review of the progress of coherent beam combining for both continuous-wave and ultrafast fiber lasers. The concept of coherent beam combining from basic notions to specific details of methods, requirements, and challenges are discussed, along with reporting some practical architectures for both continuous and ultrafast fiber lasers.

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Development status of high power fiber lasers and their coherent beam combination

Liu

Jin

et al. 2019

Sci. China Inf. Sci.

Self Cite

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High-power fiber laser has been emerged great potential in a wide range of applications and becomes a robust candidate for high energy solid state laser system. To further increase the output brightness of single-channel fiber laser, high-brightness pump sources and high-power-handling passive components should be fabricated and utilized in the fiber laser systems, in addition to the advanced techniques for multiple nonlinear effects managements. The state-of-the-art high power fiber lasers are reviewed, in terms of narrow-linewidth fiber lasers, broadband fiber lasers and fiber lasers at 2 µm. Coherent beam combining is a promising technique to obtain higher output power while maintaining excellent beam quality simultaneously, which breaks through the bottlenecks of single-channel fiber laser. Based on a series of key techniques for coherent beam combining, high-power coherent beam combining of fiber lasers could be enabled with high combining efficiency. In this paper, we review the progress of high-power fiber lasers and their coherent beam combining in the recent decade, particularly the relevant work in our group. The future prospects of fiber lasers and coherent beam combining technique are also discussed.

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Impact of temporal and spectral aberrations on coherent beam combination of nanosecond fiber lasers

Cited by 8 publications

References 22 publications

Towards Ultimate High-Power Scaling: Coherent Beam Combining of Fiber Lasers

Towards Ultimate High-Power Scaling: Coherent Beam Combining of Fiber Lasers

Towards Ultimate High-power Scaling: Coherent Beam Combing of Fiber Lasers

Development status of high power fiber lasers and their coherent beam combination

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