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RESONANT DEGENERATE FOUR-WAVE MIXING IN I-2 - EFFECT OF BUFFER GAS PRESSURE

机译：I-2共振简并四波混频-缓冲气体压力的影响

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摘要

The influence of molecular collisions on the production of the degenerate four-wave mixing signal in It is presented. Measurements were performed on gaseous molecular iodine, It, contained in a glass cell in which pressure, temperature, and species concentration are easily and independently varied. Frequency-doubled outputs from a seeded Nd:YAG laser and an excimer-pumped dye laser were used as excitation sources. We have studied the dependence of signal strength versus buffer gas pressure, with pump intensity as a third parameter. It is evident from our results that, for pump intensities of less than 1 MW/cm(2), the pressure dependence of the signal follows that given by a simple two-level model in the homogeneously broadened regime. In this regime collisional deexcitation becomes significant, leading to changes in saturation intensity. This is evidenced by a reduction in the signal with an increase in buffer gas pressure. This behavior is similar to that seen in laser-induced fluorescence. At higher pump intensities, the signal is seen to increase with pressure; this behavior cannot be described by the simple two-level model. [References: 40]
机译：提出了分子碰撞对简并四波混合信号产生的影响。对包含在玻璃池中的气态分子碘进行测量，该玻璃池中的压力，温度和物质浓度易于独立变化。来自Nd：YAG种子激光和受激准分子泵浦的染料激光的倍频输出用作激发源。我们已经研究了信号强度与缓冲气体压力之间的关系，其中泵浦强度是第三个参数。从我们的结果中可以明显看出，对于小于1 MW / cm（2）的泵浦强度，信号的压力依赖性遵循在均匀扩展范围内简单的两级模型给出的信号。在这种情况下，碰撞消磁变得很明显，导致饱和强度发生变化。这通过缓冲气体压力增加而信号减小来证明。此行为类似于在激光诱导的荧光中看到的行为。在较高的泵浦强度下，信号随压力增加而增加。简单的两级模型无法描述这种行为。 [参考：40]

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