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Dense wavelength multiplexing for a high power diode laser

机译：高功率二极管激光器的密集波长复用

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摘要

At present methods of polarization and wavelength multiplexing with dielectric coatings are used to increase the brightness of diode lasers. The number of suitable diode laser wavelengths is limited by the temperature- and current-dependent spectral characteristics of the diode laser and the slope of dielectric edge-filters. By use of external volume diffraction gratings it is possible to constrict the emission spectra of diode lasers and to reduce the wavelength shift related to temperature or current injection. Due to the stabilization of the center wavelengths and the reduced bandwidth of the diode emission multiplexing of diode laser beams at small distance of the centre wavelengths can be realized. The performance of wavelength stabilization by use of volume diffraction gratings adapted to AR-coated diode laser arrays in an external cavity as well as to standard high power diode laser arrays is discussed. Furthermore modules of two diode laser beams are combined by wavelength dependent diffraction of an adapted volume diffraction grating. The spectra of the diode lasers of the same wafer are stabilized with a centre wavelength spacing of about 3 nm and more than 95% of the optical output power of each beam within a spectral width less than 0.7 nm. An efficiency of more than 80% for multiplexing of two diode laser bars with good beam quality in fast axis of M~2 < 2 is achieved.
机译：目前，偏振和波长与介电涂层的复用方法被用于增加二极管激光器的亮度。合适的二极管激光器波长的数量受二极管激光器的温度和电流相关光谱特性以及介电边缘滤波器的斜率限制。通过使用外部体积衍射光栅，可以收缩二极管激光器的发射光谱，并减少与温度或电流注入有关的波长偏移。由于中心波长的稳定和减小的二极管发射带宽，可以实现在中心波长的小距离处的二极管激光束的多路复用。讨论了通过使用体积衍射光栅实现波长稳定的性能，该体积衍射光栅适用于外部腔体中的AR涂层二极管激光器阵列以及标准的高功率二极管激光器阵列。此外，两个二极管激光束的模块通过适应的体积衍射光栅的与波长有关的衍射来组合。同一晶片的二极管激光器的光谱以约3 nm的中心波长间隔和小于0.7 nm的光谱宽度内的每个光束的光输出功率的95％以上稳定。在M〜2 <2的快轴上实现具有良好光束质量的两个二极管激光棒的多路复用，效率达到80％以上。

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