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120W, NA_0.15 Fiber Coupled LD module with 125-μm clad / NA 0.22 fiber by spatial coupling method

机译：采用空间耦合法的125W包层/ NA 0.22光纤的120W NA_0.15光纤耦合LD模块

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摘要

We have fabricated a fiber coupled semiconductor laser diode module by means of spatial beam combining of single emitter broad area semiconductor laser diode chips in the 9xx nm band. In the spatial beam multiplexing method, the numerical aperture of the output light from the optical fiber increases by increasing the number of laser diodes coupled into the fiber. To reduce it, we have tried the approach to improving assembly process technology. As a result, we could fabricate laser diode modules having a light output power of 120W or more and 95% power within NA of 0.15 or less from a single optical fiber with 125-μm cladding diameter. Furthermore, we have obtained that the laser diode module maintaining high coupling efficiency can be realized even around the fill factor of 0.95. This has been achieved by improving the optical alignment method regarding the fast axis stack pitch of the laser diodes in the laser diode module. Therefore, without using techniques such as polarization combining and wavelength combining, high output power was realized while keeping small numerical aperture. This contributes to a reduction in unit price per light output power of the pumping laser diode module.
机译：我们通过在9xx nm波段中的单个发射器广域半导体激光二极管芯片的空间光束组合，制造了一个光纤耦合半导体激光二极管模块。在空间光束多路复用方法中，通过增加耦合到光纤中的激光二极管的数量来增加来自光纤的输出光的数值孔径。为了减少它，我们尝试了改进装配工艺技术的方法。结果，我们可以从具有125μm包层直径的单根光纤中制造出120W或更高的光输出功率和95％的功率（NA在0.15或更低）内的激光二极管模块。此外，我们已经获得了即使在0.95的填充系数附近也可以实现保持高耦合效率的激光二极管模块。这是通过改进关于激光二极管模块中激光二极管的快速轴堆叠间距的光学对准方法来实现的。因此，在不使用诸如偏振合并和波长合并的技术的情况下，在保持较小的数值孔径的同时实现了高输出功率。这有助于降低泵浦激光二极管模块的每光输出功率的单位价格。

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