Ultimate efficiency of spectral beam combining by volume Bragg gratings
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-c...
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| Veröffentlicht in: | Applied optics (2004) 2013-10, Vol.52 (30), p.7233-7242 |
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| container_issue | 30 |
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| container_title | Applied optics (2004) |
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| creator | Drachenberg, Derrek R Andrusyak, Oleksiy Venus, George Smirnov, Vadim Lumeau, Julien Glebov, Leonid B |
| description | 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. |
| doi_str_mv | 10.1364/AO.52.007233 |
| format | Article |
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| ispartof | Applied optics (2004), 2013-10, Vol.52 (30), p.7233-7242 |
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| language | eng |
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| source | Alma/SFX Local Collection; Optica Publishing Group Journals |
| subjects | Beams (radiation) Bragg gratings Engineering Sciences Laser beams Lasers Mathematical models Optics Photonic Radiance Spectra |
| title | Ultimate efficiency of spectral beam combining by volume Bragg gratings |
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