Automatic low-order aberration correction based on geometrical optics for slab lasers

Yu, Xin; Dong, Lizhi; Lai, Boheng; Liu, Yong; Kong, Qingfeng; Yang, Kangjian; Tang, Gong‐Jian; Xu, Bing

doi:10.1364/ao.56.001730

Cited by 9 publications

(3 citation statements)

References 21 publications

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“…It is found that the peak-to-valley (PV) value of the wavefront is 1.16 µm and the root mean square (RMS) is 0.26 µm after subtracting the defocus and tilt, since these low-order aberrations can be easily corrected by geometric optics. [16] It also can be seen from the measured result that the wavefront distortion is relatively small compared to Ref. [17].…”

Section: Experimental Investigation To the Vcsel Side-pumped Rod Lasermentioning

confidence: 68%

A 658-W VCSEL-pumped rod laser module with 52.6% optical efficiency

Li¹,

Yang²,

Zhang³

et al. 2022

Chinese Phys. B

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A high-efficiency and high-power vertical-cavity surface-emitting laser (VCSEL) side-pumped rod Nd:YAG laser with temperature adaptability is demonstrated. The VCSEL side-pumped laser module is designed and optimized. Five VCSEL array is symmetrically located around the laser rod and a large size diffused reflection chamber is designed to ensure a uniform pump distribution. Furthermore, the absorbed pump power distribution of the rod is simulated to verify the uniformity of the pump absorption. Finally, a proof-of-principle experiment is performed in short linear cavity laser with single laser module. A continuous-wave output power of 658 W at 1064 nm is obtained, the corresponding optical-to-optical efficiency is 52.6%, and the power variations are ± 0.7% over 400 s and ± 3.1% over the temperature range from 16℃ to 26℃. To the best of our knowledge, this is the highest output power and the highest optical-to-optical efficiency ever reported for VCSEL pumped solid-state lasers. By inserting a telescopic module into the cavity and optimizing the TEM00 mode volume, the average beam quality is measured to be M 2=1.34 under an output power of 102 W. The experimental results reveal that such a high power rod laser module with temperature stability is appropriate for field applications.

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Section: Experimental Investigation To the Vcsel Side-pumped Rod Lasermentioning

confidence: 68%

A 658-W VCSEL-pumped rod laser module with 52.6% optical efficiency

Li¹,

Yang²,

Zhang³

et al. 2022

Chinese Phys. B

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“…Adaptive optics (AO) is a technology that can correct the wavefront distortion of the laser beam in real-time, as shown in Figure 1 . It can compensate the dynamic laser beam aberration in real-time, and has been applied in many laser systems with remarkable results [ 10 , 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Wavefront Restoration Technology of Dynamic Non-Uniform Intensity Distribution Based on Extreme Learning Machine

Lin

Wang

2021

Sensors

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Non-uniform intensity distribution of laser near-field beam results in the irregular shape of the spot in the wavefront sensor. The intensity of some sub-aperture spots may be too weak to be detected, and the accuracy of wavefront restoration is seriously affected. Therefore, an extreme learning machine method is proposed to realize high precision wavefront restoration under dynamic non-uniform intensity distribution. The simulation results show that this method has better accuracy of wavefront restoration than the classical modal algorithm under dynamic non-uniform intensity distribution. The root mean square error of the residual wavefront for the proposed method is only 2.9% of the initial value.

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“…For example, in 2014, Yang et al from the Institute of Optics and Electronics, Chinese Academy of Sciences, enhanced the beam quality of a solid-state slab laser with an output power of 1.3 kW from 13.1 to 2.3 times the diffraction limit using an AO system without wave-front detection [8]. In 2017, the Institute of Optics and Electronics at the Chinese Academy of Sciences reduced the output beam's PV values of wave-front from 57.26 to 1.87 μm with a loworder aberration autocorrection approach under limitations [9]. In 2018, Yang et al determined the beam quality factor for a 750-MW solid-state slab laser to be 1.64 times the diffraction limit using an AO system combined with the related low-order aberration-correction approach [10].…”

mentioning

confidence: 99%

The Multiparameter Measurement Technique in a Large-Aperture Rectangular Laser Beam Aberration Correction System

Guotao

Xin

et al. 2022

IEEE Photonics J.

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Adaptive optics (AO) can effectively improve the beam quality of solid-state slab lasers. However, the aperture of the output beam increases as the output power of the laser increases, resulting in a larger measurement system. Ultimately, a more complex AO system needs to be designed. To meet the requirements of conjugate imaging in an AO system, it is of research significance to coordinate and optimize the system's structural dimensional parameters while enabling the detection of multiple parameters, such as the wave-front and beam quality. In this paper, a multiparameter measurement technique in a largeaperture rectangular laser beam aberration-correction system is proposed. The system layout is optimized with total dimensions of 400 mm × 150 mm × 246 mm (L × W × H). The AO system conforms to the requirements for conjugate detection and can perform wave-front detection, far-field evaluation, and near-field detection of a 160 mm × 120 mm rectangular beam produced from a solid-state slab laser. The findings reveal that the measured PV values of wave-fronts of the measurement system are less than 0.288 μm, the RMS is no more than 0.079 μm, the average far-field beam quality factor is 1.248 times the diffraction limit, and the average near-field beam uniformity is 0.533 at a temperature of 20°C ± 10°C; these results satisfy the technical parameters.

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Automatic low-order aberration correction based on geometrical optics for slab lasers

Cited by 9 publications

References 21 publications

A 658-W VCSEL-pumped rod laser module with 52.6% optical efficiency

A 658-W VCSEL-pumped rod laser module with 52.6% optical efficiency

Wavefront Restoration Technology of Dynamic Non-Uniform Intensity Distribution Based on Extreme Learning Machine

The Multiparameter Measurement Technique in a Large-Aperture Rectangular Laser Beam Aberration Correction System

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