Expansion of the channel number in spectral beam combining of fiber lasers array based on cascaded gratings

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

doi:10.1016/j.optcom.2008.04.033

Cited by 5 publications

(3 citation statements)

References 14 publications

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“…(5) above, and the beam's Gaussian profiles in both angle and spectral space given by Eqs. (11) and (12)…”

Section: Optimization Of Single-stage Sbc Considering Finite Divermentioning

confidence: 99%

“…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%

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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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“…(5) above, and the beam's Gaussian profiles in both angle and spectral space given by Eqs. (11) and (12)…”

Section: Optimization Of Single-stage Sbc Considering Finite Divermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ultimate efficiency of spectral beam combining by volume Bragg gratings

et al. 2013

View full text Add to dashboard Cite

show abstract

“…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%