Effect of crosstalk on combined beam characteristics in spectral beam combining systems

Yang, Lei; Wu, Zhen; Zhong, Zheqiang; Zhang, Bin

doi:10.1016/j.optcom.2016.09.060

Cited by 13 publications

(4 citation statements)

References 24 publications

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“…Figure 1 illustrates an SBC system that is mainly composed of a diode laser array, a fast-axis collimator, a slow-axis collimator, a transform lens, a grating, and an output coupler. 16 The part formed by the front surface and the rear surface of the diode laser is called an internal cavity, and the space between the front surface and the coupler is regarded as an external cavity. The beam reflected by the external cavity is injected into the internal cavity and helps emitters to lock their spectra.…”

Section: Beam Modes Oscillating In the Sbc Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…In other words, the SBC acts as a feedback system, and the locked spectra of the arrayed emitters possibly have side modes, which inevitably affects beam propagation in the external cavity. Yang et al 16,17 showed the peak energy of the combined beam would decrease, and the beam quality deteriorated due to beam crosstalk. Therefore, locked spectra of the diode laser array are closely related to beam propagation in the external cavity and the combined beam characteristics.…”

Section: Introductionmentioning

confidence: 99%

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Spectral-combined beam characteristics based on external cavity feedback diode laser array

Zhang

Cai

et al. 2023

Opt. Eng.

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In spectral beam combining systems, the locked spectra of the diode laser array are determined by the interaction between the internal cavity and the external cavity. Using the multibeam interference theory, spectral modes locked by the coupled cavity are numerically calculated and analyzed. A spectral mode of a diode emitter is divided into a main lobe, a left sidelobe, and a right sidelobe, which is mainly affected by the position of the diode emitter. Based on the locked spectral modes, a beam propagation model in the grating-external cavity is established by the diffraction integral method and the incoherent superposition principle. The effects of the interval between two adjacent emitters, the reflectivity of the front surface, and the distance between the grating and the coupler on the characteristics of the combined beam have been discussed in detail. The results show that the beam quality and the spot size of the combined beam gradually degrade with the increasing interval. By reducing the reflectivity of the front surface of the diode emitter and decreasing the distance between the grating and the coupler, the beam quality can be improved. Among the three factors, such as the interval between two adjacent emitters, the reflectivity of the front surface of an emitter, and the diffraction distance, the interval has the most sensitive impact on the combined beam characteristics. Thus a beam shrinker to convert big beams into small beams in diameter can be adopted to optimize the combined beam.

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Section: Beam Modes Oscillating In the Sbc Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spectral-combined beam characteristics based on external cavity feedback diode laser array

Zhang

Cai

et al. 2023

Opt. Eng.

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“…6, which is the same as that from the conventional SBC. It can be observed that there are nineteen emission peaks in the measured spectrum, and no crosstalk occurs between the adjacent emission peaks [21] . The measured wavelength space of the whole spectrum and the interval between the adjacent emission peaks are about 7.7 and 0.43 nm, respectively.…”

mentioning

confidence: 93%

High beam quality broad-area diode lasers by spectral beam combining with double filters

et al. 2019

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A modified spectral beam combining (SBC) approach based on double asymmetrical filters was proposed. By using this scheme, the high-order lateral modes at the edge of the far-field pattern can be suppressed in the external cavity, and the beam quality in the slow-axis direction was improved from 16.1 to 13.4 compared to the conventional SBC. In the meanwhile, the electrical-to-optical efficiency from the modified SBC was more than 40% with an output power of 34.1 W, which is similar to that of the conventional SBC.

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Analysis of crosstalk in spectral beam-combining systems based on oscillation modes

Cai

Feng

et al. 2023

Appl. Phys. B

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Effect of crosstalk on combined beam characteristics in spectral beam combining systems

Cited by 13 publications

References 24 publications

Spectral-combined beam characteristics based on external cavity feedback diode laser array

Spectral-combined beam characteristics based on external cavity feedback diode laser array

High beam quality broad-area diode lasers by spectral beam combining with double filters

Analysis of crosstalk in spectral beam-combining systems based on oscillation modes

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