Spectral beam combining of fiber lasers based on a transmitting volume Bragg grating

Zhan, Shengbao; Zhao, Shanghong; Chu, Xingchun; Zhuo-liang, WU; Shi, Lei

doi:10.1016/j.optlastec.2009.07.010

Cited by 8 publications

(4 citation statements)

References 9 publications

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“…According to the combining principle for SBC of two laser beams based on a VBG, 18 we designed a simple system using an R‐VBG, as shown in Figure 1. First, an R‐VBG with a fringes plane perpendicular to the grating surface was chosen; one can derive that the incidence angle in a medium equals the diffraction angle.…”

Section: Design and Analysis Of Sbcmentioning

confidence: 99%

“…In our previous work, our research group presented a simple experimental setup for SBC, which was designed using a transmission VBG and a coupling system made of focusing and collimating lenses. The experimental results show that the combining efficiency of the system was about 69% 18 . Although the collimating lenses were used in this system to solve the problem of beam divergence, the effects of beam divergence on the combined effect had not been analyzed and compared in detail.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of spectral beam combining based on reflecting volume Bragg grating, with and without collimating lenses

Wang

Zhan

Xiang

et al. 2022

Micro & Optical Tech Letters

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On the basis of the principle of spectral beam combining (SBC), a simple combining system using a reflecting volume Bragg grating as a combiner was designed in which two focusing lenses were used to control the incident angles of input beams, and two concave lenses were used to solve the problem of beam divergence caused by focusing lenses. The effects of the beam divergence angle (DA) on diffraction efficiency and beam quality were analyzed theoretically. The simulation results showed that a larger DA will reduce diffraction efficiency and lead to deterioration of beam quality. In the SBC experiment, the performances of the output beam with and without concave lenses were compared. The experimental results showed that, when the concave lenses were not inserted, the measured output power was 503 mW with a combining efficiency of 85.3% and the beam quality factor of 1.68. The experiment further showed that the combined power was 566 mW with a combining efficiency of 96% and a beam quality factor of 1.31 when concave lenses were used.

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Section: Design and Analysis Of Sbcmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparison of spectral beam combining based on reflecting volume Bragg grating, with and without collimating lenses

Wang

Zhan

Xiang

et al. 2022

Micro & Optical Tech Letters

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“…In order to combine fiber lasers as many as possible under a limited fiber gain bandwidth, the spectra fineness of SBC system should be improved. It can be achieved by means of utilizing blazed grating with higher line density or Fourier transform lens with longer focal length [13][14][15][16]. However, the available grating line density is restricted by the machining arts.…”

Section: Introductionmentioning

confidence: 99%

Influence of transform-lens focal length on spectral beam combining in an external cavity with a microlens array

Zhan

Zhuo-liang²,

He³

et al. 2017

Optics Communications

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“…High-power beam combining that increases brightness in comparison to that of original beams can be broadly categorized into two approaches: coherent and incoherent beam combining [6]. Incoherent beam combining can be accomplished by the use of an angularly dispersive element such as a surface diffraction grating [7,8], a prism [9], or by a spectral-filtering (dichroic) element such as thin film filters [10] or volume Bragg gratings (VBGs) [11][12][13][14]. Other incoherent methods of beam combining such as incoherent arrays, fiber bundles, or beam-transformation lenses are not capable of increasing the radiance of the combined beam over that of a single beam according to the radiance theorem, which states that the combined spectral radiance of a set of mutually incoherent but otherwise identical beams cannot be increased over that of the highest radiance beam [15].…”

Section: Introductionmentioning

confidence: 99%

Ultimate efficiency of spectral beam combining by volume Bragg gratings

et al. 2013

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Spectral beam combining (SBC) by volume Bragg gratings (VBGs) recorded in photo-thermo-refractive (PTR) glass is a powerful tool for laser applications that require higher radiance than a single laser unit can achieve. The beam-combining factor (BCF) is introduced as a tool to compare various beam-combining methods and experiments. It describes the change of radiance provided by a beam-combining system but is not affected by the initial beam quality of the combined lasers. A method of optimization of VBGs providing the maximum efficiency of SBC has been described for an arbitrary number of beams. An experiment confirming the proposed modeling for a two-beam SBC system by a single VBG has demonstrated a total combined power of 301 W with a channel separation of 0.25 nm, combining efficiency of 97%, close to diffraction limited divergence with M(2)=1.18, BCF of 0.77, and spectral radiance of 770 TW/(sr·m(2)·nm), the highest to date for SBC.

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Spectral beam combining of fiber lasers based on a transmitting volume Bragg grating

Cited by 8 publications

References 9 publications

Comparison of spectral beam combining based on reflecting volume Bragg grating, with and without collimating lenses

Comparison of spectral beam combining based on reflecting volume Bragg grating, with and without collimating lenses

Influence of transform-lens focal length on spectral beam combining in an external cavity with a microlens array

Ultimate efficiency of spectral beam combining by volume Bragg gratings

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