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Linewidth reduction in a large-smile laser diode array

机译:大微笑激光二极管阵列的线宽减小

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摘要

We present theory and simulations for a spectral narrowing scheme for laser diode arrays (LDAs) that employs optical feedback from a diffraction grating. We calculate the effect of the so-called smile of the LDA and show that it is possible to reduce the effect by using a cylindrical lens set at an angle to the beam. The scheme is implemented on a 19-element LDA with smile of 7.6 (mu)m and yields frequency narrowing from a free-running width of 2 to 0.15 nm. The experimental results are in good agreement with the theory.
机译:我们介绍了采用来自衍射光栅的光反馈的激光二极管阵列(LDA)的光谱窄化方案的理论和仿真。我们计算了LDA的所谓微笑的效果,并表明可以通过使用与光束成一定角度设置的柱面透镜来减少效果。该方案在微笑为7.6μm的19元素LDA上实施,产生的频率从2到0.15 nm的自由运行宽度变窄。实验结果与理论吻合良好。

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