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首页> 外文会议>Conference on High-Power Diode Laser Technology and Applications II; 20040126-20040127; San Jose,CA; US >Characterization of tapered diode laser bars for the use in high power diode laser systems
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Characterization of tapered diode laser bars for the use in high power diode laser systems

机译：大功率二极管激光系统中使用的锥形二极管激光棒的特性

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摘要

For further development in beam quality of high power diode laser systems a new type of diode laser bars has been realized recently. Compared to commercially available broad area diode laser bars the lateral design of tapered diode laser bars consists of a ridge waveguide and a tapered section, where the tapered structure determines high output power and the high brightness is provided by the ridge waveguide structure. Unfortunately the different lateral structure leads to astigmatism effects which are also thermally affected in continous wave operation. Hence in terms of diode laser systems with essentially fast- and slow-axis collimation microoptics the full characterization of tapered diode laser bars is necessary. Where the wavelengths and divergences of tapered diode laser bars are relatively easy to measure, the beam profile with its apparently inside the tapered structure located lateral source is not. With a telecentric optics the caustic of the individual emitters of the bars are detected by the use of a fiber sensor with a resolution of 10 μm in fast-and slow-axis direction. Subsequently with beam analysis software the astigmatism can be calculated. As a result of several measurements of tapered bars of different wavelengths we detected good homogeneity over the bar concerning the amount of astigmatism but a slight current dependency. So particularly with regard to beam shaping microoptics the application to high power diode laser systems seems to be sophisticated so far.
机译：为了进一步发展高功率二极管激光系统的光束质量，最近已经实现了新型的二极管激光棒。与市售的广域二极管激光棒相比，锥形二极管激光棒的横向设计由脊形波导和锥形部分组成，其中锥形结构决定了高输出功率，而高亮度由脊形波导结构提供。不幸的是，不同的横向结构会导致散光效果，在连续波操作中也会受到热影响。因此，对于具有基本快轴和慢轴准直微光学器件的二极管激光器系统，锥形二极管激光器棒的全部特性是必需的。在锥形二极管激光棒的波长和发散度相对容易测量的地方，明显位于内部横向源的锥形结构内的光束轮廓却不那么容易。使用远心光学元件，通过使用在快轴和慢轴方向上分辨率为10μm的光纤传感器，可以检测出各个条形发射器的腐蚀性。随后使用光束分析软件可以计算散光。作为对不同波长的锥形棒的几次测量的结果，我们在棒上发现了关于散光量的良好同质性，但电流依赖性很小。因此，到目前为止，特别是对于光束整形微光学，在高功率二极管激光器系统上的应用似乎很复杂。

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