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Diode Lasers optimized in Brightness for Fiber Laser Pumping

机译：优化了亮度的二极管激光器，用于光纤激光器抽运

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摘要

In diode laser applications for fiber laser pumping and fiber-coupled direct diode laser systems high brightness becomes essential in the last years. Fiber coupled modules benefit from continuous improvements of high-power diode lasers on chip level regarding output power, efficiency and beam characteristics resulting in record high-brightness values and increased pump power. To gain high brightness not only output power must be increased, but also near field widths and far field angles have to be below a certain value for higher power levels because brightness is proportional to output power divided by beam quality. While fast axis far fields typically show a current independent behaviour, for broad-area lasers far-fields in the slow axis suffer from a strong current and temperature dependence, limiting the brightness and therefore their use in fibre coupled modules. These limitations can be overcome by carefully optimizing chip temperature, thermal lensing and lateral mode structure by epitaxial and lateral resonator designs and processing. We present our latest results for InGaAs/AlGaAs broad-area single emitters with resonator lengths of 4mm emitting at 976nm and illustrate the improvements in beam quality over the last years. By optimizing the diode laser design a record value of the brightness for broad-area lasers with 4mm resonator length of 126 MW/cm~2sr has been demonstrated with a maximum wall-plug efficiency of more than 70%. From these design also pump modules based on 9 mini-bars consisting of 5 emitters each have been realized with 360W pump power.
机译：在用于光纤激光器泵浦和光纤耦合的直接二极管激光器系统的二极管激光器应用中，近几年来高亮度变得至关重要。光纤耦合模块得益于芯片级高功率二极管激光器在输出功率，效率和光束特性方面的不断改进，从而产生了创纪录的高亮度值并提高了泵浦功率。为了获得高亮度，不仅必须增加输出功率，而且对于更高的功率水平，近场宽度和远场角也必须低于某个值，因为亮度与输出功率除以光束质量成正比。虽然快轴远场通常显示出电流独立的行为，但对于广域激光器，慢轴远场具有很强的电流和温度依赖性，从而限制了亮度，因此限制了它们在光纤耦合模块中的使用。这些限制可以通过外延和横向谐振器设计与处理来仔细优化芯片温度，热透镜和横向模式结构来克服。我们介绍了InGaAs / AlGaAs宽面积单发射器的最新结果，其谐振器长度为4mm，在976nm处发射，并说明了过去几年光束质量的改进。通过优化二极管激光器的设计，已证明4mm谐振器长度为126 MW / cm〜2sr的广域激光器的亮度记录值达到了70％以上的最大壁挂效率。通过这些设计，还实现了基于9个迷你条的泵模块，该模块由5个发射器组成，每个发射器具有360W的泵浦功率。

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  • 会议地点 San Francisco(US)
  • 作者

    M. Kelemen; J. Gilly; P. Friedmann; S. Hilzensauer; L. Ogrodowski; H. Kissel; J. Biesenbach;

  • 作者单位

    Coherent-DILAS GmbH, Hermann-Mitsch-Str.36a, D-79108 Freiburg, Germany;

    Coherent-DILAS GmbH, Hermann-Mitsch-Str.36a, D-79108 Freiburg, Germany;

    Coherent-DILAS GmbH, Hermann-Mitsch-Str.36a, D-79108 Freiburg, Germany;

    Coherent-DILAS GmbH, Hermann-Mitsch-Str.36a, D-79108 Freiburg, Germany;

    Coherent-DILAS GmbH, Hermann-Mitsch-Str.36a, D-79108 Freiburg, Germany;

    Coherent-DILAS GmbH, Galileo-Galilei-Str. 10, D-55129 Mainz, Germany;

    Coherent-DILAS GmbH, Galileo-Galilei-Str. 10, D-55129 Mainz, Germany;

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