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BEAM QUALITY OF INGAAS RIDGE LASERS AT HIGH OUTPUT POWER

机译：高输出功率的INGAAS脊柱激光的光束质量

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The nonlinear behavior of the light-current characteristic of single quantum well, graded-index-separate-heterostructure ridge laser diodes emitting at 980 nm is investigated. We have measured the beam-quality factor M(2) as a function of the output power, under continuous-wave and transient conditions. The time constant associated with beam degradation under the transient condition suggests that the temperature profile in the cavity plays a significant role in the lateral guiding of the lasing modes. The two-dimensional heat equation is solved for the device, and the time-resolved thermally induced refractive-index profile is computed. There is excellent agreement between the time required to reach a steady index profile and that required to degrade the beam. The small beam astigmatism (typically 2 mu m) measured under CW operating conditions in the linear regime indicates that the mode is essentially index guided, which permits simple quantitative modeling of the waveguide. [References: 16]
机译：研究了单量子阱，折射率分开的异质结构脊形激光二极管在980 nm处发射的光电流特性的非线性行为。在连续波和瞬态条件下，我们已经测量了光束质量因数 M （2）作为输出功率的函数。在瞬态条件下与光束降解相关的时间常数表明，腔体中的温度分布在激光模式的横向引导中起着重要作用。对该装置求解二维热方程，并计算时间分辨的热诱导折射率分布。达到稳定的折射率分布所需的时间与使光束降级所需的时间之间有着极好的一致性。在连续波工作条件下，在线性状态下测得的小光束像散（通常为2μm）表明该模式基本上是折射率引导的，这允许对波导进行简单的定量建模。 [参考：16]

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