Spectral Beam Combining of Fiber Lasers by Using Reflecting Volume Bragg Gratings

By employing three reflecting volume Bragg gratings, a near-infrared 4-channel spectral-beam-combining system is demonstrated to present 720 W combined power with a combining efficiency of 94.7%. The combined laser beam is near-diffraction-limited with a beam factor M^2-1.54. During this 4-channel b...

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Bibliographic Details
Published inChinese physics letters Vol. 33; no. 12; pp. 68 - 72
Main Author 周泰斗 梁小宝 李超 赵磊 王建军 景峰
Format Journal Article
LanguageEnglish
Published 01.12.2016
Subjects
体积
光纤激光器
光谱
反射体
激光束
红外通道
组合系统
衍射极限
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ISSN0256-307X
1741-3540
DOI10.1088/0256-307X/33/12/124205

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Summary:By employing three reflecting volume Bragg gratings, a near-infrared 4-channel spectral-beam-combining system is demonstrated to present 720 W combined power with a combining efficiency of 94.7%. The combined laser beam is near-diffraction-limited with a beam factor M^2-1.54. During this 4-channel beam-combining process, no special active cooling measures are used to evaluate the volume Bragg gratings as combining elements are under the higher power laser operation. Thermal expansion and period distortion are verified in a 2 k W 2-channel beam-combining process, and the heat issue in the transmission case is found to be more remarkable than that in the diffraction e-se. Transmitted and diffracted beams experience wave-front aberrations with different degrees, thus leading to distinct beam deterioration.
Bibliography:TM-Dou Zhou, Xiao-Bao Liang, Chao Li, Lei Zhao, Jian-Jun Wang, Feng Jing（Laser Fusion Research Center, China Academy of Engineering Physics （CAEP）, Mianyang 621900）
11-1959/O4
By employing three reflecting volume Bragg gratings, a near-infrared 4-channel spectral-beam-combining system is demonstrated to present 720 W combined power with a combining efficiency of 94.7%. The combined laser beam is near-diffraction-limited with a beam factor M^2-1.54. During this 4-channel beam-combining process, no special active cooling measures are used to evaluate the volume Bragg gratings as combining elements are under the higher power laser operation. Thermal expansion and period distortion are verified in a 2 k W 2-channel beam-combining process, and the heat issue in the transmission case is found to be more remarkable than that in the diffraction e-se. Transmitted and diffracted beams experience wave-front aberrations with different degrees, thus leading to distinct beam deterioration.
ISSN:0256-307X
1741-3540
DOI:10.1088/0256-307X/33/12/124205