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arXiv 1405.7614physics.optics
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腔内光栅滤光片被动锁模半导体激光器的优化设计

Design optimization of passively mode-locked semiconductor lasers with intracavity grating spectral filters

Finbarr O'Callaghan, David Bitauld, Stephen O'Brien

摘要:

我们考虑采用腔内光栅光谱滤波器的被动锁模两段式半导体激光器的设计优化。我们的目标是开发一种方法,找到最佳的波长位置的过滤器,以最大限度地提高该地区的稳定锁模作为一个功能的驱动电流和反向偏置的吸收部分。为了解释激光器两个部分中的材料色散,我们使用增益和吸收作为载流子密度和频率的函数的解析近似。拟合测量的增益和吸收曲线,然后提供输入的基础上的锁模激光器的大信号精确延迟微分模型的数值模拟。我们展示了如何为每个值的驱动电流和反向偏置电压的一组独特的模型参数可以选择的基础上的净增益沿分支的模型的稳态解的变化。我们证明了这种方法的有效性,通过展示数值模拟和测量的两部分法布里-珀罗激光器的电流-电压相空间之间的定性协议。然后,我们展示了如何适应这种方法,以确定一个最佳位置的光谱滤波器在一个名义上的设备具有相同的材料成分,基于目标锁定范围,并占模式的选择性的过滤器。

英文摘要:

We consider design optimization of passively mode-locked two-section semiconductor lasers that incorporate intracavity grating spectral filters. Our goal is to develop a method for finding the optimal wavelength location for the filter in order to maximize the region of stable mode-locking as a function of drive current and reverse bias in the absorber section. In order to account for material dispersion in the two sections of the laser, we use analytic approximations for the gain and absorption as a function of carrier density and frequency. Fits to measured gain and absorption curves then provide inputs for numerical simulations based on a large signal accurate delay-differential model of the mode-locked laser. We show how a unique set of model parameters for each value of the drive current and reverse bias voltage can be selected based on the variation of the net gain along branches of steady-state solutions of the model. We demonstrate the validity of this approach by demonstrating qualitative agreement between numerical simulations and the measured current-voltage phase-space of a two-section Fabry-Perot laser. We then show how to adapt this method to determine an optimum location for the spectral filter in a notional device with the same material composition, based on the targeted locking range, and accounting for the modal selectivity of the filter.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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