High power diode laser source with a transmission grating for two spectral beam combining

Tian, Jingyu; Zhang, Jun; Peng, Haijun; Lei, Yuxin; Q, Li; Wang, Lijun

doi:10.1016/j.ijleo.2019.06.018

Cited by 8 publications

(2 citation statements)

References 6 publications

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“…In order to obtain an output laser with higher power and better beam quality to satisfy the application of directed energy, it is necessary to build laser array and combine to it to form a single focused beam. At present, the main method of beam combination for high-power laser includes incoherent combi-nation [6][7][8][9], coherent combination [10][11][12][13] and spectral combination [14][15][16]. In fact, no matter which method is chosen, when propagating over atmosphere, the far-field beam quality of laser will inevitably be declined due to atmospheric turbulence.…”

Section: Introductionmentioning

confidence: 99%

Research on the propagation of laser beams arraywith coherent and incoherent combination in dynamic atmosphere turbulence

Deng¹,

Wang²,

Gan³

et al. 2022

Optica Applicata

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High-power laser systems mostly use coherent or incoherent combined beams to achieve higher laser output power to satisfy the application. However, the far-field beam quality of laser will be reduced when propagating over atmosphere. Based on the propagation model of laser beams array, we use atmospheric coherence length, laser duration and average wind velocity to construct dynamic atmospheric turbulence which is characterized as a phase screen sequence. Meanwhile, considered as the indexes to evaluate beam quality, peak intensity and intensity in bucket are comparatively analysed in coherent and incoherent combined beams in far-field. The results indicate that in weaker turbulence circumstances, coherent combined beam has an advantage compared with the incoherent combined beams when laser duration is short, and coherent combination is more suitable for pulsed laser. With laser duration is increasing, the beam quality of incoherent and coherent combined beams both decrease and tend to be close. In stronger turbulence circumstances, the corresponding laser duration will be shorter when the beam quality of coherent combined beams is extraordinary close to that of incoherent combined beams. The researches can provide important data for high-power laser system to select the optimal beam combination mode to improve its performance.

show abstract

Section: Introductionmentioning

confidence: 99%

Research on the propagation of laser beams arraywith coherent and incoherent combination in dynamic atmosphere turbulence

Deng¹,

Wang²,

Gan³

et al. 2022

Optica Applicata

View full text Add to dashboard Cite

show abstract

“…In 2013, Zhang et al, in Changchun Institute of Optics, Fine Mechanics and Physics, demonstrated a cw output power of 50.8 W at 970 nm with a spectral beam combining ef-ficiency of 90.2% and the transmission grating is first introduced in SBC. [9] They demonstrated a 212 W cw output power with BPP of 4.27 mm•mrad by combining eight 800 nm laser bars, [10] and the spectral beam combing efficiency is not mentioned. Sun et al proposed a modified off-axis spectral beam combining method.…”

mentioning

confidence: 99%

High-Efficiency Spectral-Beam-Combined 930nm Diode Laser Source*

Xu¹,

Wang²,

Zhang³

et al. 2020

Chinese Phys. Lett.

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Spectral beam combining is an effective way to achieve high-brightness direct diode laser output. We present an experimental study on spectral beam combining with external cavity based on transmission grating. Using a series of cylindrical transform lenses with different focal lengths, spectral beaming combining efficiency is greatly improved, and the results of wavelength intervals are consistent with the theoretical calculations. With the injection current of 90 A, a 75.1 W cw 930 nm output power with wavelength span of 18.6 nm and spectral beam combining efficiency of 92.7% is achieved, the beam parameter product is 5.77 mm⋅mrad.

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Modulated spectral beam combining of diode laser array stack in an external cavity for the enhancement of beam quality

Chen

Jiang

et al. 2023

J Opt

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High power diode laser source with a transmission grating for two spectral beam combining

Cited by 8 publications

References 6 publications

Research on the propagation of laser beams arraywith coherent and incoherent combination in dynamic atmosphere turbulence

Research on the propagation of laser beams arraywith coherent and incoherent combination in dynamic atmosphere turbulence

High-Efficiency Spectral-Beam-Combined 930nm Diode Laser Source*

Modulated spectral beam combining of diode laser array stack in an external cavity for the enhancement of beam quality

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