Lacot Eric, Jacquin Olivier, Roussely Grégoire, Hugon Olivier, Guillet de Chatellus Hugues
Laboratoire de Spectrométrie Physique, Unité Mixte de Recherche 5588, Université Joseph Fourier de Grenoble, Centre National de la Recherche Scientifique, BP 87, 38402 Saint Martin d'Hères, France.
J Opt Soc Am A Opt Image Sci Vis. 2010 Nov 1;27(11):2450-8. doi: 10.1364/JOSAA.27.002450.
For given laser output power, object under investigation, and photodiode noise level, we have theoretically compared the signal-to-noise ratios of a heterodyne scanning imager based on a Michelson interferometer and of an autodyne setup based on the laser optical feedback imaging (LOFI) technique. In both cases, the image is obtained point by point. In the heterodyne configuration, the beating between the reference beam and the signal beam is realized outside the laser cavity (i.e., directly on the detector), while in the autodyne configuration, the wave beating takes place inside the laser cavity and therefore is indirectly detected. In the autodyne configuration, where the laser relaxation oscillations play a leading role, we have compared one-dimensional scans obtained by numerical simulations with different lasers' dynamical parameters. Finally, we have determined the best laser for LOFI applications and the experimental conditions for which the LOFI detection setup (autodyne interferometer) is competitive compared to a heterodyne interferometer.
对于给定的激光输出功率、待测物体和光电二极管噪声水平，我们从理论上比较了基于迈克尔逊干涉仪的外差扫描成像仪与基于激光光学反馈成像（LOFI）技术的自差装置的信噪比。在这两种情况下，图像都是逐点获取的。在外差配置中，参考光束与信号光束之间的拍频在激光腔外实现（即直接在探测器上），而在自差配置中，波的拍频发生在激光腔内，因此是间接检测的。在自差配置中，激光弛豫振荡起主导作用，我们将通过数值模拟获得的一维扫描结果与不同激光动力学参数进行了比较。最后，我们确定了适用于LOFI应用的最佳激光器，以及与外差干涉仪相比，LOFI检测装置（自差干涉仪）具有竞争力的实验条件。
