Two-beam coherent combining based on Ti:sapphire chirped-pulse amplification at the repetition of 1  Hz

Peng, Chun; Liang, Xiaoyan; Liu, Renqi; Li, Wenqi; Li, Ruxin

doi:10.1364/ol.44.004379

Cited by 21 publications

(9 citation statements)

References 33 publications

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“…Besides, the wavefront control is also necessary in each segment beamline, which is the basic requirement for a high‐quality coherent beam combining. [ 158,159,162,163 ]…”

Section: Capability‐boosting Technologiesmentioning

confidence: 99%

“…In engineering, the coherent beam combining is an efficient technology for power or energy scaling breaking the limit within a single beamline, [146][147][148][149][150][151] which currently has already been widely used in fusion driven lasers, power diode lasers, power fiber lasers, etc. [152][153][154][155][156][157] Because of extremely high energy and ultrabroadband spectrum, Figure 13a shows that the tiled-aperture configuration [158,159] is a better choice for the next-generation short-pulse PW laser rather than the filled-aperture configuration (polarization-or spectrum-dependent methods). [160] Figure 13b shows the schematic of a tiled-aperture coherent beam combining with two segment beams, and the combined beam is focused by a single parabola for an extremely high focused intensity.…”

Section: Coherent Beam Combiningmentioning

confidence: 99%

“…Besides, the wavefront control is also necessary in each segment beamline, which is the basic requirement for a high-quality coherent beam combining. [158,159,162,163] In the past decade, the divided-pulse amplification, [164] as a new type of coherent combining in the time domain, was widely used in high power/energy lasers, especially in fiber lasers and solid-state lasers. [151,[165][166][167][168] However, due to (optical-cycle-level) ultrashort pulses [(octave-spanning) broadband spectra], high energies and large beams in a short-pulse PW laser, the requirements of optics and controls would be extremely high, and greatly challenging the feasibility of this technology in the engineering application here.…”

Section: Coherent Beam Combiningmentioning

confidence: 99%

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Further Development of the Short‐Pulse Petawatt Laser: Trends, Technologies, and Bottlenecks

Leng

2022

Laser & Photonics Reviews

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The petawatt (PW) laser has experienced a rapid development in the past two decades, and tens of giant facilities have been constructed worldwide. After realizing 10–100 PW, it seems to be close to some sort of engineering limit but its focused peak intensity still is much lower than the Schwinger limit, and therefore some technology improvements or innovations become indispensable for further increasing the peak power as well as the focused peak intensity. By quick reviewing the development of the PW laser in history, it is shown that reducing the pulse duration to near a single optical cycle is a feasible (easy and cheap) choice for this purpose. Here, technologies for the optical‐cycle pulse generation, ultrabroadband amplification, and capability boosting that aim to provide possible approaches for optical‐cycle PW lasers are briefly reviewed and discussed. Meanwhile, key bottlenecks that challenge the current as well as the future short‐pulse PW lasers and their possible solutions are summarized and discussed. This technology review aims to provide a possible roadmap for the next‐stage development of the short‐pulse PW laser.

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“…Besides, the wavefront control is also necessary in each segment beamline, which is the basic requirement for a high‐quality coherent beam combining. [ 158,159,162,163 ]…”

Section: Capability‐boosting Technologiesmentioning

confidence: 99%

Section: Coherent Beam Combiningmentioning

confidence: 99%

Section: Coherent Beam Combiningmentioning

confidence: 99%

See 1 more Smart Citation

Further Development of the Short‐Pulse Petawatt Laser: Trends, Technologies, and Bottlenecks

Leng

2022

Laser & Photonics Reviews

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“…Nevertheless, owing to the damage threshold and the aperture limit, the increase of single-channel output scheme is facing difficult challenges. Coherent beam combination (CBC) is a promising technique to solve the output problem from another direction 8 – 10 Experts attempt to combine multi-channel lasers to achieve higher output power.…”

Section: Introductionmentioning

confidence: 99%

Deep learning assisted far-field multi-beam pointing measurement

Peng

Liang

2023

Opt. Eng.

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We present and experimentally verify a deep learning approach to synchronously measure the multi-beam pointing error for coherent beam combining systems. This approach uses only one detector by acquiring the far-field interference focal spot, which can greatly reduce the complexity in coherent beam combining systems with high accuracy. The amplitude modulation is utilized to eliminate the confusion of the label values in symmetric system. The position assist camera is used to acquire accurate label value, which solves the mismatch between sample and label value caused by ambient vibration in long-term data acquisition. In simulation and experiment, the RMS accuracy is about 0.3 and 0.5 μrad, respectively, which can greatly meet the pointing measurement requirement in coherent beam combining systems. The result shows that this approach can be well applied to multi-beam coherent combination for high-power laser systems.

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“…In the same year, Marco Kienel [25] also reported the demonstration of two coherently polarized sub-beams combined with CPA systems, which verified the feasibility of CBC based on CPA structure and bulk amplifiers. In 2019, our group reported the realization of two sub-beams based on the CPA structure and multi-pass Ti:sapphire amplifiers [26]. In 2019, Renqi Liu reported a phasing method for the tiled-aperture CBC of three sub-beams based on a continuous laser, which proposed and verified a practical phasing method for multi-beam tiled-aperture CBC [27].…”

Section: Introductionmentioning

confidence: 99%

Four-Beam Tiled-Aperture Coherent Beam Combining of High-Power Femtosecond Laser With Two Compressors

Peng¹,

Li²,

Liang³

et al. 2022

IEEE Photonics J.

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The former reports of coherent beam combining (CBC) in the ultra-intense ultra-short laser field focus on the phase control technology and two-beam CBC. To study the four-beam tiled-aperture CBC in the ultra-intense and ultra-short laser field, we demonstrate four-beam CBC of femtosecond laser pulses based on chirped pulse amplification (CPA) scheme. In this experiment, the four beams were compressed using two grating compressors to simulate the situation in ultra-intense and ultra-short laser CBC systems. To achieve real-time measurement of the phase error between the four beams, we introduced a continuous reference laser and the phases of beams 2, 3, and 4 were locked to beam 1.A combined efficiency of 57% was achieved. Although the coherent combining efficiency is not very high, the possibility of a fourbeam CBC based on the CPA scheme was confirmed, especially with different grating compressors which can reduce the limitation of gratings in single beam petawatt lasers. Finally, the remaining difficulties in the implementation of CBC of four beams and the methods to improve its efficiency were analyzed. The use of CBC in ultra-intense and ultrashort laser systems is of considerable significance.

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Two-beam coherent combining based on Ti:sapphire chirped-pulse amplification at the repetition of 1 Hz

Cited by 21 publications

References 33 publications

Further Development of the Short‐Pulse Petawatt Laser: Trends, Technologies, and Bottlenecks

Further Development of the Short‐Pulse Petawatt Laser: Trends, Technologies, and Bottlenecks

Deep learning assisted far-field multi-beam pointing measurement

Four-Beam Tiled-Aperture Coherent Beam Combining of High-Power Femtosecond Laser With Two Compressors

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