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首页> 外文期刊>Applied optics >Systematic errors in laser gain, saturation irradiance, and cavity loss measurements and comparison with a HCN laser
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Systematic errors in laser gain, saturation irradiance, and cavity loss measurements and comparison with a HCN laser

机译：激光增益，饱和辐照度和腔损耗测量中的系统误差以及与HCN激光器的比较

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摘要

A pair of laser parameters of considerable practical interest are the small signal gain and saturation irradiance of the gain medium. These are commonly measured by observing the dependence of the output power on some adjustable cavity loss parameter and comparing the measured data with the predictions of a suitable laser model. Because of the inevitable approximations, in this model the resulting estimates of gain and saturation irradiance are always affected to some extent by systematic errors. The small.gain, plane-wave, mean-field, and pure homogeneous or inhomogeneous line-broadening approximations are considered, with estimates of the magnitudes of these errors being presented for the case in which the gain, the. saturation irradiance,and the cavity loss are fitted to the data. It is shown that these errors can be quite substantial, and therefore, accurate absolute measurements of the three laser parameters, can be quite difficult to obtain using the variable loss method.As an illustration of these errors, a comparison between the measured output power from a HCN laser and the power predicted using experimentally measured gain and saturation irradiance values is shown. The poor quality of these predictions illustrates the serious effects that the systematic errors can have, although an alternative analysis in which the cavity loss is supplied and only the gain and saturation irradiance fitted is also shown and gives good predictions despite inaccuracies in the model.#1999 Optical Society of America OCIS codes: 140.3430, 140.3280, 140.4480.
机译：一对具有重大实际意义的激光参数是增益介质的小信号增益和饱和辐照度。通常通过观察输出功率对某些可调腔损耗参数的依赖性并将测量数据与合适激光模型的预测值进行比较来进行测量。由于不可避免的近似，在该模型中，所得的增益和饱和辐照度估计值总是在一定程度上受到系统误差的影响。考虑了小增益，平面波，平均场和纯均匀或不均匀的线宽近似，并针对增益情况给出了这些误差幅度的估计。饱和辐照度和腔体损耗与数据拟合。结果表明，这些误差可能相当大，因此使用可变损耗方法很难获得三个激光参数的准确绝对测量值。显示了HCN激光器以及使用实验测量的增益和饱和辐照度值预测的功率。这些预测的质量较差，说明了系统误差可能产生的严重影响，尽管也提供了一种替代分析，其中提供了腔损耗，并且仅显示了拟合的增益和饱和辐照度，尽管模型不准确，但仍可以提供良好的预测。＃ 1999年美国光学学会OCIS编码：140.3430、140.3280、140.4480。

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