Mode structure fluctuations in a pulsed dye laser.
Mode structure fluctuations in a pulsed dye laser.
复制标题
脉冲染料激光器中的模式结构波动。
DOI：
10.1364/ao.31.006987
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发表时间：
1992
期刊：
影响因子：
1.9
通讯作者：
R. Salomaa
中科院分区：
文献类型：
--
作者：
T. Kajava;H. Lauranto;R. Salomaa
我们测量和分析了一台典型商用染料激光器的高分辨单脉冲光谱。利用斐索干涉仪作为频谱分析仪，对纵模结构进行了解析。在模式强度中，我们观察到强烈的脉冲间波动，这主要是由激光脉冲起始阶段激光模式的自发辐射的变化引起的。除了量子噪声，频率抖动，即，还观察到整个频率梳的偏移。抖动看起来非常快，大约为几兆赫，因此不能仅用技术噪声来解释。在非线性光谱噪声效应的理论模型中，需要对光谱涨落有详细的了解。它也可以应用于新的降噪技术。
We have measured and analyzed high-resolution single-pulse spectra of a typical commercial dye laser. The longitudinal mode structure was resolved by using a Fizeau interferometer as the spectrum analyzer. In mode intensities we observed strong pulse-to-pulse fluctuations that are caused mainly by the variations of the spontaneous emissions to the laser modes during the starting phase of the laserpulse. Apart from the quantum noise, frequency jitter, i.e., shifts of the whole frequency comb, was also observed. The jitter appeared to be very fast, of the order of a few megahertz and hence cannot be explained by technical noise alone. A detailed knowledge of the spectral fluctuations is needed in theoretical models of noise effects in nonlinear spectroscopy. It can also be applied to novel noise reduction techniques.