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首页> 外文会议>SPIE Conference on High-Power Diode Laser Technology >Coherent combining of high brightness tapered lasers in Master Oscillator Power Amplifier configuration
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Coherent combining of high brightness tapered lasers in Master Oscillator Power Amplifier configuration

机译：高亮度锥形激光器在主振荡器功率放大器配置中的相干组合

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Improved diode laser beam combining techniques are in strong demand for applications in material processing. Coherent beam combining (CBC) is the only combining approach that has the potential to maintain or even improve all laser properties, and thus has high potential for future systems. As part of our ongoing studies into CBC of diode lasers, we present recent progress in the coherent superposition of high-power single-pass tapered laser amplifiers. The amplifiers are seeded by a DFB laser at λ= 976 nm, where the seed is injected into a laterally single-mode ridge-waveguide input section. The phase pistons on each beam are actively controlled by varying the current in the ridge section of each amplifier, using a sequential hill-climbing algorithm, resulting in a combined beam with power fluctuations of below 1%. The currents into the tapered sections of the amplifiers are separately controlled, and remain constant. In contrast to our previous studies, we favour a limited number of individual high-power amplifiers, in order to preserve a high extracted power per emitter in a simple, low-loss coupling arrangement. Specifically, a multi-arm interferometer architecture with only three devices is used, constructed using 6 mm-long tapered amplifiers, mounted junction up on C-mounts, to allow separate contact to single mode and amplifier sections. A maximum coherently combined power of 12.9 W is demonstrated in a nearly diffraction-limited beam, corresponding to a 65% combining efficiency, with power mainly limited by the intrinsic beam quality of the amplifiers. Further increased combined power is currently sought.
机译：改进的二极管激光束组合技术对材料处理中的应用有很强的需求。相干光束组合（CBC）是具有维持甚至改善所有激光特性的唯一组合方法，因此对未来系统具有很高的潜力。作为我们正在进行的二极管激光CBC的研究的一部分，我们在高功率单通过锥形激光放大器的相干叠加中提出了最近的进展。放大器通过λ= 976nm的DFB激光接种，其中将种子注入横向单模脊 - 波导输入部分。使用顺序爬山算法改变每个放大器的脊部分中的电流来主动控制每个光束上的相位活塞，从而产生具有低于1％的功率波动的组合光束。分别控制放大器的锥形部分的电流，并保持恒定。与我们以前的研究相比，我们赞成有限数量的单个高功率放大器，以便以简单的低损耗联接装置保持每个发射器的高提取功率。具体地，使用仅使用三个设备的多臂干涉仪架构，使用6mm长的锥形放大器，安装在C安装件上的连接，以允许单模和放大器部分单独接触。在几乎衍射限制的光束中对相对应的最大合并功率为12.9W，对应于65％的组合效率，功率主要受放大器的内在光束质量的限制。目前正在寻求进一步提高综合权力。

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